High-toughness die-casting aluminum-silicon alloy material and preparation method thereof

Abstract

The invention relates to the technical field of metal alloy preparation and development, in particular to a high-toughness die-casting aluminum-silicon alloy material and a preparation method thereof. The aluminum-silicon alloy material comprises the following components in percentage by mass: 8.0% to 9.0% of Si, 0.2% to 0.3% of Mg, 0.6% to 0.7% of Mn, 0.1% to 3.0% of Cu, 0.10% to 0.18% of Ti, 0.01% to 0.03% of V, 0.05% to 0.35% of Zn, 0.02% to 0.04% of Sr, 0.01% to 0.02% of La, 0.01% to 0.02% of Ce, 0% to 0.1% of Fe, 0% to 0.004% of Na, 0% to 0.002% of B and the balance of Al. The aluminum-silicon alloy material provided by the invention has excellent tensile property, compression property and shearing property, and the comprehensive performance of the alloy material is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal alloy preparation and development, and in particular to a high-strength and toughness die-cast aluminum-silicon alloy material and a preparation method thereof. Background Art

[0002] Aluminum silicon alloy is a forging and casting alloy with aluminum and silicon as the main components. The silicon content is generally 11%. A small amount of copper, iron, nickel, etc. are added to improve the strength. The density is about 2.6-2.7g / cm 3 The thermal conductivity is about 101~126W / (m·℃), the Young's modulus is 71.0GPa, the impact value is about 7~8.5J, and the fatigue limit is ±45MPa.

[0003] Al-Si alloy is widely used in the automotive industry and machinery manufacturing industry to make parts used under sliding friction conditions because of its light weight, good thermal conductivity, certain strength, hardness and corrosion resistance.

[0004] Die casting has the characteristics of high productivity, high casting precision, and dimensional stability, and is often used to manufacture Al-Si alloys. Based on high-quality, efficient, and low-cost manufacturing, there is a practical demand for the high strength and toughness of cast Al-Si die-cast alloys. For example, when producing rotating ring castings in industrial fire pipe joints, die-cast Al-Si alloys with good comprehensive mechanical properties are required, such as tensile strength greater than 240MPa, elongation greater than 4%, etc. However, the elongation of related alloys is currently difficult to meet the requirements. Therefore, it is of positive significance to develop new cast high-strength and toughness die-cast Al-Si alloys. Summary of the invention

[0005] Based on this, it is necessary to provide a high-strength and toughness die-cast aluminum-silicon alloy material and its preparation method. The die-cast aluminum-silicon alloy material of the present application has high yield strength, tensile strength and high elongation, which can meet the existing production requirements for comprehensive mechanical properties of parts, especially elongation.

[0006] In a first aspect of the present application, a high-strength and toughness die-cast aluminum-silicon alloy material is provided, comprising the following components by weight percentage:

[0007] Si 8.0%~9.0%, Mg 0.2%~0.3%, Mn 0.6%~0.7%, Cu 0.1%~3.0%, Ti 0.10%~0.18%, V 0.01%~0.03%, Zn 0.05%~0.35%, Sr 0.02%~0.04%, La 0.01%~0.02%, Ce0.01%~0.02%, Fe 0%~0.1%, Na 0%~0.004%, B 0%~0.002% and the balance Al.

[0008] In some of the embodiments, the following elements are included, by weight percentage: Si 8.0%-8.5%, Mg 0.2%-0.25%, Mn 0.6%-0.65%, Cu 0.1%-2.0%, Ti 0.10%-0.18%, V 0.01%-0.03%, Zn 0.05%-0.25%, Sr 0.02%-0.04%, La 0.01%-0.02%, Ce 0.01%-0.02%, Fe 0%-0.1%, Na 0%-0.004%, B 0%-0.002% and the balance Al.

[0009] In a second aspect of the present application, there is provided a method for preparing the high-strength and toughness die-cast aluminum-silicon alloy material according to the first aspect, comprising the following steps:

[0010] S1: Add Al, Zn and AlSi20 into a smelting furnace and heat them up to melt.

[0011] S2: Raise the temperature to 740℃~760℃ again, add AlMn10, AlCu10, AlTi10, Al5V, ​​keep warm until all raw materials are completely melted, and stir for 5min~10min.

[0012] S3: Cool down to 680℃~690℃, add Mg, keep warm until completely melted, stir for 5min~10min, heat up to 720℃~730℃, add refining agent, stir and skim.

[0013] S4: Add AlSr10, AlLa30, AlCe10, keep warm until completely melted, and stir for 5min~10min to obtain an alloy melt.

[0014] S5: Die-casting the alloy melt in step S4 at 700° C. to 710° C. to obtain a high-strength and toughness die-cast aluminum-silicon alloy material.

[0015] In some of the embodiments, in S1, the purity of Al is ≥99.9%; the purity of Zn is ≥99.9%.

[0016] In some embodiments, in S2 and S3, the stirring is stirring in the same direction.

[0017] In some of the embodiments, in S3, the purity of Mg is ≥99.9%.

[0018] In some embodiments, in S3, the refining agent is a three-in-one refining agent.

[0019] In some of the embodiments, in S3, the amount of the three-in-one refining agent added is 0.8% to 1.2% of the total mass of the melt in step S3.

[0020] In some of the embodiments, in S5, the alloy melt is subjected to a composition analysis before die casting, the composition content of the alloy melt is detected, and the melt with a deviation in content is adjusted so that its composition satisfies the composition ratio defined in the first aspect above.

[0021] In some of the embodiments, at least one alloy among AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10 contains at least one of Fe, Na, and B.

[0022] This application improves the mechanical properties of aluminum-based alloys by regulating the types and contents of each element in aluminum-silicon alloys, and by adding alloying elements such as Si, Mg, Fe, Mn, Cu, etc. through mechanisms such as solid solution strengthening, fine grain strengthening, and microalloying design. The fluidity and mechanical properties can be improved by adding Si elements, but its content needs to be controlled to avoid the precipitation of primary Si phase; although the addition of Fe elements can reduce the stickiness, the AlFeSi phase formed will damage the mechanical properties, so Mn elements are added to improve the Fe-rich phase morphology and improve strength and plasticity. Trace elements such as V, Ti, B, Sr, etc. improve mechanical properties through fine grain strengthening, among which Al-Ti-B master alloy is used as a refiner, and the addition of Sr elements helps to refine the eutectic structure and improve plasticity, and V addition can improve tensile strength. That is, the present application prepares aluminum silicon material with higher tensile properties through the combined synergistic effect of various elements and the control of content. The yield strength of the material can reach 120MPa~150MPa, the tensile strength is 300MPa~350MPa, and the elongation is 10%~15%. DETAILED DESCRIPTION

[0023] References to embodiments of the present application will now be provided in detail, one or more embodiments of which are described below. Each embodiment is provided as an explanation rather than a limitation of the present application. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present application without departing from the scope or spirit of the present application. For example, a feature described or described as part of one embodiment may be used in another embodiment to produce a further embodiment.

[0024] Therefore, it is intended that the present application covers such modifications and variations that fall within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present application are disclosed in or are apparent from the following detailed description. It will be appreciated by those of ordinary skill in the art that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the present application.

[0025] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0026] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0027] In this article, when referring to the unit of a data range, if there is a unit only after the right endpoint, it means that the units of the left and right endpoints are the same. For example, 100~150 ℃ means that the units of the left endpoint "100" and the right endpoint "150" are both ℃ (Celsius).

[0028] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0029] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0030] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, mentioning that the method may also include step (c) means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0031] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0032] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0033] In view of the problem that the comprehensive mechanical properties of cast Al-Si die-casting alloys in traditional technology are poor, the present application proposes a high-strength and toughness die-casting aluminum-silicon alloy material to solve the above-mentioned technical problems existing in traditional cast Al-Si die-casting alloys.

[0034] In a first aspect, the present application provides a high-strength and toughness die-cast aluminum-silicon alloy material, comprising the following components by weight percentage:

[0035] Si 8.0%~9.0%, Mg 0.2%~0.3%, Mn 0.6%~0.7%, Cu 0.1%~3.0%, Ti 0.10%~0.18%, V 0.01%~0.03%, Zn 0.05%~0.35%, Sr 0.02%~0.04%, La 0.01%~0.02%, Ce0.01%~0.02%, Fe 0%~0.1%, Na 0%~0.004%, B 0%~0.002% and the balance Al.

[0036] In some of the embodiments, the following elements are included, by weight percentage: Si 8.0%-8.5%, Mg 0.2%-0.25%, Mn 0.6%-0.65%, Cu 0.1%-2.0%, Ti 0.10%-0.18%, V 0.01%-0.03%, Zn 0.05%-0.25%, Sr 0.02%-0.04%, La 0.01%-0.02%, Ce 0.01%-0.02%, Fe 0%-0.1%, Na 0%-0.004%, B 0%-0.002% and the balance Al.

[0037] It is understandable that the present invention can improve the mechanical properties of aluminum-based alloys by regulating the types and contents of each element in the aluminum-silicon alloy, through mechanisms such as solid solution strengthening, fine grain strengthening and microalloying design, and adding alloying elements such as Si, Mg, Fe, Mn, Cu, etc. By adding Si elements, fluidity and mechanical properties can be improved, but its content needs to be controlled to avoid the precipitation of primary Si phase. Although the addition of Fe elements can reduce stickiness, the AlFeSi phase formed will damage the mechanical properties. Therefore, Mn elements are added to improve the Fe-rich phase morphology and improve strength and plasticity. Trace elements such as V, Ti, B, Sr, etc. improve mechanical properties through fine grain strengthening, wherein Al-Ti-B master alloy is used as a refiner, and the addition of Sr elements helps to refine the eutectic structure and improve plasticity, and V addition can improve tensile strength. The present application prepares aluminum silicon material with high tensile properties through the combined synergistic effect of various elements and the control of content. The yield strength of the material can reach 120MPa~150MPa, the tensile strength is 300MPa~350MPa, and the elongation is 10%~15%.

[0038] In a second aspect of the present application, there is provided a method for preparing the high-strength and toughness die-cast aluminum-silicon alloy material according to the first aspect, comprising the following steps:

[0039] S1: Add Al, Zn and AlSi20 into a smelting furnace and heat them up to melt.

[0040] S2: Raise the temperature to 740℃~760℃ again, add AlMn10, AlCu10, AlTi10, Al5V, ​​keep warm until all raw materials are completely melted, and stir for 5min~10min.

[0041] S3: Cool down to 680℃~690℃, add Mg, keep warm until completely melted, stir for 5min~10min, heat up to 720℃~730℃, add refining agent, stir and skim.

[0042] S4: Add AlSr10, AlLa30, AlCe10, keep warm until completely melted, and stir for 5min~10min to obtain an alloy melt.

[0043] S5: Die-casting the alloy melt in step S4 at 700° C. to 710° C. to obtain a high-strength and toughness die-cast aluminum-silicon alloy material.

[0044] It can be understood that before step S1, a material preparation process is also included. The raw materials of the high-strength and toughness die-casting aluminum-silicon alloy material of the present application include pure aluminum (Al), pure manganese (Mg), pure zinc (Zn), and intermediate alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10.

[0045] It is understandable that, since intermediate alloys often contain impurity elements such as Fe, Na, and B, the Fe content, Na content, and B content should be strictly tested and controlled when selecting intermediate alloys. Specifically, the raw materials such as pure aluminum and intermediate alloys used should be tested for incoming materials, and the national standard GB / T 27677-2017 trace element control standards should be implemented. Only after the incoming materials are qualified can they be used for the preparation of high-strength and toughness die-casting aluminum alloy materials. This application has no strict requirements on the proportion of the main elements of the above-mentioned intermediate alloys, and it can be proportioned into the composition of the expected alloy. There are no special requirements for the content of impurity elements in pure aluminum and each alloy, and it can be proportioned into the composition of the expected alloy.

[0046] In some embodiments, the material preparation is carried out according to the designed alloy composition, and a large alloy ingot can be cut into small pieces.

[0047] In some embodiments, the preparation tools must be made of stainless steel, and must be cleaned, painted, and dried before use.

[0048] In some of the embodiments, in S1, the purity of Al is ≥99.9%; the purity of Zn is ≥99.9%.

[0049] It can be understood that in S1, the temperature is raised to 700°C for melting.

[0050] It is understandable that before S2, the process also includes placing the intermediate alloys except AlSi20 at the furnace side or in an oven for baking at 200°C for standby use.

[0051] In some embodiments, in S2 and S3, the stirring is steady stirring in the same direction.

[0052] In some embodiments, in S2, the temperature is again raised to 740°C-760°C, including but not limited to 740°C, 745°C, 750°C, 755°C, and 760°C.

[0053] In some embodiments, in S2, stirring for 5 min to 10 min includes but is not limited to 5 min, 6 min, 7 min, 8 min, 9 min, and 10 min.

[0054] In some of the embodiments, in S3, the purity of Mg is ≥99.9%.

[0055] In some embodiments, in S3, the temperature is lowered to 680°C-690°C, including but not limited to 680°C, 682°C, 684°C, 686°C, 688°C, and 690°C.

[0056] In some embodiments, in S3, Mg is added and kept warm until it is completely melted. Specifically, after adding pure Mg, a bell jar is used to press the pure Mg below the liquid surface and keep warm until it is completely melted.

[0057] In some embodiments, in S3, stirring for 5 min to 10 min includes but is not limited to 5 min, 6 min, 7 min, 8 min, 9 min, and 10 min.

[0058] In some embodiments, in S3, the temperature is raised to 720°C-730°C, including but not limited to 720°C, 722°C, 724°C, 726°C, 728°C, and 730°C.

[0059] In some of the embodiments, in S3, the refining agent is a three-in-one refining agent.

[0060] In some embodiments, the refining agent is a 45% NaCl + 55% KCl eutectic mixed salt, which has a good wettability for Al2O3 inclusions and oxide films and can be well spread on the melt surface.

[0061] In some of the embodiments, in S3, the amount of the three-in-one refining agent added is 0.8% to 1.2% of the total mass of the melt in step S3, including but not limited to 0.8%, 0.9%, 1.0%, 1.1%, and 1.2%.

[0062] In some embodiments, in S4, AlSr10, AlLa30, and AlCe10 are added and kept warm until they are completely melted. Specifically, AlSr10, AlLa30, and AlCe10 are added, the above alloys are pressed below the liquid surface using a bell jar, and then kept warm until they are completely melted.

[0063] In some embodiments, in S5, before die casting the alloy melt, the alloy melt is further subjected to component analysis, the component content of the alloy melt is detected, and the melt with a content deviation is adjusted so that its composition satisfies the component ratio defined in the first aspect. The detection can be measured by a spectrometer.

[0064] In some of the embodiments, at least one alloy among AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10 contains at least one of Fe, Na, and B.

[0065] The following are specific embodiments.

[0066] Example 1

[0067] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in the alloy are shown in Table 1 (the proportions are calculated based on a total of 100%).

[0068] Table 1: Elements and proportions in the aluminum-silicon alloy material of Example 1

[0069]

[0070] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0071] 1. Prepare the required ingredients

[0072] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. Among them, the purity of pure Al is ≥99.9%, the purity of pure Mg is ≥99.9%, and the purity of pure Zn is ≥99.9%.

[0073] The above raw materials are proportioned according to the element contents in Table 1 and used for the smelting process.

[0074] 2. Melting process

[0075] (1) Add pure Al, Zn, and AlSi20 into a melting furnace, heat up and melt them, and bake the remaining alloy at 200°C for later use.

[0076] (2) Then raise the temperature to 750°C, add the intermediate alloys AlMn10, AlCu10, AlTi10, and Al5V, ​​maintain the temperature until the intermediate alloy is completely melted, and then stir steadily in one direction for 8 minutes.

[0077] (3) Cool down to 685℃, add pure Mg, use bell jar to press pure Mg below the liquid surface, and stir steadily in one direction for 8 minutes after it is completely melted; heat up to 725℃, add 1% of the total amount of the existing melt, stir and skim. The three-in-one refining agent is a eutectic mixed salt of 45% NaCl + 55% KCl.

[0078] (4) Add the intermediate alloys AlSr10, AlLa30, and AlCe10, press them below the liquid surface using a bell jar, and after they are completely melted, stir them steadily in one direction for 8 minutes to obtain an alloy melt. Before casting, take a standard sample of the alloy melt composition, and measure the actual composition of the alloy using a spectrometer to ensure that the melt composition meets the requirements of each component in Table 1.

[0079] (5) The alloy melt is die-casted at 705°C to obtain a high-strength and toughness die-cast aluminum-silicon alloy material.

[0080] The composition and proportion of each element in the high-strength and toughness die-cast aluminum-silicon alloy material prepared in this embodiment are shown in Table 1 above.

[0081] Example 2

[0082] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 2 (the proportions are calculated based on a total of 100%).

[0083] Table 2: Elements and proportions in the aluminum-silicon alloy material of Example 2

[0084]

[0085] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0086] 1. Prepare the required ingredients

[0087] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. Among them, the purity of pure Al is ≥99.9%, the purity of pure Mg is ≥99.9%, and the purity of pure Zn is ≥99.9%. The above raw materials are calculated according to the element content in Table 2 and used for the smelting process.

[0088] 2. Melting process

[0089] The process of smelting according to the ingredients is the same as that in Example 1.

[0090] Example 3

[0091] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 3 (the proportions are calculated based on a total of 100%).

[0092] Table 3: Elements and proportions in the aluminum-silicon alloy material of Example 3

[0093]

[0094] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0095] 1. Prepare the required ingredients

[0096] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and intermediate alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. Among them, the purity of pure Al is ≥99.9%, the purity of pure Mg is ≥99.9%, and the purity of pure Zn is ≥99.9%. The above raw materials are calculated according to the element content in Table 3 and used for the smelting process.

[0097] 2. Melting process

[0098] The process of smelting according to the ingredients is the same as that in Example 1.

[0099] Example 4

[0100] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 4 (the proportions are calculated based on a total of 100%).

[0101] Table 4: Elements and proportions in the aluminum-silicon alloy material of Example 4

[0102]

[0103] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0104] 1. Prepare the required ingredients

[0105] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 4 and used for the smelting process.

[0106] 2. Melting process

[0107] The process of smelting according to the ingredients is the same as that in Example 1.

[0108] Example 5

[0109] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 5 (the proportions are calculated based on a total of 100%).

[0110] Table 5: Elements and proportions in the aluminum-silicon alloy material of Example 5

[0111]

[0112] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0113] 1. Prepare the required ingredients

[0114] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 5 and used for the smelting process.

[0115] 2. Melting process

[0116] The process of smelting according to the ingredients is the same as that in Example 1.

[0117] Example 6

[0118] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 6 (the proportions are calculated based on a total of 100%).

[0119] Table 6: Elements and proportions in the aluminum-silicon alloy material of Example 6

[0120]

[0121] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0122] 1. Prepare the required ingredients

[0123] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 6 and used for the smelting process.

[0124] 2. Melting process

[0125] The process of smelting according to the ingredients is the same as that in Example 1.

[0126] Example 7

[0127] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 7 (the proportions are calculated based on a total of 100%).

[0128] Table 7: Elements and proportions in the aluminum-silicon alloy material of Example 7

[0129]

[0130] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0131] 1. Prepare the required ingredients

[0132] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 7 and used for the smelting process.

[0133] 2. Melting process

[0134] The process of smelting according to the ingredients is the same as that in Example 1.

[0135] Example 8

[0136] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 8 (the proportions are calculated based on a total of 100%).

[0137] Table 8: Elements and proportions in the aluminum-silicon alloy material of Example 8

[0138]

[0139] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0140] 1. Prepare the required ingredients

[0141] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 8 and used for the smelting process.

[0142] 2. Melting process

[0143] The process of smelting according to the ingredients is the same as that in Example 1.

[0144] Example 9

[0145] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 9 (the proportions are calculated based on a total of 100%).

[0146] Table 9: Elements and proportions in the aluminum-silicon alloy material of Example 9

[0147]

[0148] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0149] 1. Prepare the required ingredients

[0150] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 9 and used for the smelting process.

[0151] 2. Melting process

[0152] The process of smelting according to the ingredients is the same as that in Example 1.

[0153] Example 10

[0154] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 10 (the proportions are calculated based on a total of 100%).

[0155] Table 10: Elements and proportions in the aluminum-silicon alloy material of Example 10

[0156]

[0157] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0158] 1. Prepare the required ingredients

[0159] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 10 and used for the smelting process.

[0160] 2. Melting process

[0161] The process of smelting according to the ingredients is the same as that in Example 1.

[0162] Comparative Example 1

[0163] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 11 (the proportions are calculated based on a total of 100%).

[0164] Table 11: Elements and proportions in the aluminum-silicon alloy material of Comparative Example 1

[0165]

[0166] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0167] 1. Prepare the required ingredients

[0168] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 11 and used for the smelting process.

[0169] 2. Melting process

[0170] The process of smelting according to the ingredients is the same as that in Example 1.

[0171] Comparative Example 2

[0172] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 12 (the proportions are calculated based on a total of 100%).

[0173] Table 12: Elements and proportions in the aluminum-silicon alloy material of Comparative Example 2

[0174]

[0175] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0176] 1. Prepare the required ingredients

[0177] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 12 and used for the smelting process.

[0178] 2. Melting process

[0179] The process of smelting according to the ingredients is the same as that in Example 1.

[0180] Comparative Example 3

[0181] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 13 (the proportions are calculated based on a total of 100%).

[0182] Table 13: Elements and proportions in the aluminum-silicon alloy material of Comparative Example 3

[0183]

[0184] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0185] 1. Prepare the required ingredients

[0186] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 13 and used for the smelting process.

[0187] 2. Melting process

[0188] The process of smelting according to the ingredients is the same as that in Example 1.

[0189] Comparative Example 4

[0190] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 14 (the proportions are calculated based on a total of 100%).

[0191] Table 14: Elements and proportions in the aluminum-silicon alloy material of Comparative Example 4

[0192]

[0193] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0194] 1. Prepare the required ingredients

[0195] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 14 and used for the smelting process.

[0196] 2. Melting process

[0197] The process of smelting according to the ingredients is the same as that in Example 1.

[0198] Comparative Example 5

[0199] A high-strength and toughness die-cast aluminum-silicon alloy material, the elements and proportions contained in it are shown in Table 15 (the proportions are calculated based on a total of 100%).

[0200] Table 15: Elements and proportions in the aluminum-silicon alloy material of Comparative Example 5

[0201]

[0202] The preparation method of high-strength and toughness die-cast aluminum-silicon alloy material is as follows:

[0203] 1. Prepare the required ingredients

[0204] The raw materials for preparing high-strength and toughness die-casting aluminum-silicon alloy materials include pure aluminum (Al), pure magnesium (Mg), pure zinc (Zn), and master alloys: AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10. The above raw materials are proportioned according to the element contents in Table 15 and used for the smelting process.

[0205] 2. Melting process

[0206] The process of smelting according to the ingredients is the same as that in Example 1.

[0207] The die-cast aluminum-silicon alloy materials prepared in Examples 1-10 and Comparative Examples 1-5 were tested for tensile properties; compression properties and shear properties of Examples 1-10, and the test results are shown in Table 16 and Table 17, respectively. Table 16 shows tensile properties, and Table 17 shows compression properties and shear properties.

[0208] Table 16: Tensile properties of materials prepared in Examples and Comparative Examples

[0209]

[0210] Table 17: Compression and shear properties of alloy materials prepared in Example

[0211]

[0212] It can be seen from the above table that the alloy material obtained by the preparation method of the high-strength and toughness die-cast aluminum-silicon alloy material provided in the present application has better comprehensive tensile performance than the control example, and has better compression and shear properties, that is, has excellent overall mechanical properties.

[0213] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high-strength and toughness die-cast aluminum-silicon alloy material, characterized in that: By weight percentage, it includes the following components: Si 8.0%~9.0%, Mg 0.2%~0.3%, Mn 0.6%~0.7%, Cu 0.1%~3.0%, Ti 0.10%~0.18%, V 0.01%~0.03%, Zn 0.05%~0.35%, Sr 0.02%~0.04%, La 0.01%~0.02%, Ce0.01%~0.02%, Fe 0%~0.1%, Na 0%~0.004%, B 0%~0.002% and the balance Al.

2. The high-strength and toughness die-cast aluminum-silicon alloy material according to claim 1, characterized in that: Calculated by weight percentage, the following elements are included: Si 8.0%~8.5%, Mg 0.2%~0.25%, Mn 0.6%~0.65%, Cu 0.1%~2.0%, Ti0.10%~0.18%, V 0.01%~0.03%, Zn 0.05%~0.25%, Sr 0.02%~0.04%, La 0.01%~0.02%, Ce 0.01%~0.02%, Fe 0%~0.1%, Na 0%~0.004%, B 0%~0.002% and the balance Al.

3. A method for preparing the high-strength and toughness die-cast aluminum-silicon alloy material according to any one of claims 1 to 2, characterized in that: The steps include: S1: Add Al, Zn and AlSi20 into the smelting furnace and heat them up to melt; S2: Heat up to 740℃~760℃ again, add AlMn10, AlCu10, AlTi10, Al5V, ​​keep warm until all raw materials are completely melted, and stir for 5min~10min; S3: Cool down to 680℃~690℃, add Mg, keep warm until completely melted, stir for 5min~10min, heat up to 720℃~730℃, add refining agent, stir and skim; S4: Add AlSr10, AlLa30, AlCe10, keep warm until completely melted, and stir for 5min~10min to obtain alloy melt; S5: Die-casting the alloy melt in step S4 at 700° C. to 710° C. to obtain a high-strength and toughness die-cast aluminum-silicon alloy material.

4. The preparation method according to claim 3, characterized in that: In S1, the purity of Al is ≥99.9%; the purity of Zn is ≥99.9%.

5. The preparation method according to claim 3, characterized in that: In S2 and S3, the stirring is carried out in the same direction.

6. The preparation method according to claim 3, characterized in that: In S3, the purity of Mg is ≥99.9%.

7. The preparation method according to claim 3, characterized in that: In S3, the refining agent is a three-in-one refining agent.

8. The preparation method according to claim 3, characterized in that: In S3, the amount of the three-in-one refining agent added is 0.8% to 1.2% of the total mass of the melt in step S3.

9. The preparation method according to claim 3, characterized in that: In S5, before the alloy melt is die-casted, the alloy melt is subjected to a composition analysis to detect the component content of the alloy melt, and the melt with a deviation in content is adjusted so that its composition satisfies the composition ratio defined in any one of claims 1 to 2.

10. The preparation method according to claim 3, characterized in that: Among the AlSi20, AlMn10, AlCu10, AlTi10, Al5V, ​​AlSr10, AlLa30, and AlCe10, at least one alloy contains at least one of the Fe element, the Na element, and the B element.

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