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Lightweight high-strength cast aluminum-lithium alloy and preparation method thereof

A technology for casting aluminum and lithium alloys, which is applied in the field of metal materials and metallurgy, can solve problems such as poor casting performance, serious hot cracking tendency of castings, and anisotropy, so as to improve casting performance and mechanical properties, and reduce hydrogen absorption and oxidation , The effect of thinning effect is weakened

Active Publication Date: 2016-11-23
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

Among many types of aluminum-lithium alloys, deformed aluminum-lithium alloys are widely used in aerospace and other fields due to their high strength and good plasticity. However, deformed aluminum-lithium alloys have the following problems: many production processes, serious anisotropy problems, and The Li content in the alloy is low, and when replacing other aluminum alloys, it cannot achieve a very obvious weight reduction effect, and the application of the deformed alloy is limited by the shape of the parts. Some parts can only be produced by casting, so it is necessary to develop Cast aluminum-lithium alloys with excellent casting performance and mechanical properties and low cost
Russian scientists (Effect of alloying elements on the structure and properties of Al-Li-Cu cast alloys, Russian Metallurgy, 2009, 4, 338-344) studied the influence of alloying elements on the properties of cast aluminum-lithium alloys, and developed the A cast aluminum-lithium alloy with better performance obtained by adding different trace elements to the Al-Li-Cu ternary alloy, but its casting performance is poor, the hot cracking tendency of the casting is serious, and some alloy elements added are radioactive; Shandong University Han Jiande et al. (Microstructure and Properties of Cast Al-Li-Cu Alloy, Casting Technology, 2002, 23(4), 245-247) studied the Al-Li-Cu ternary casting alloy by changing the content of Li and Cu Changes in the structure and properties of the alloy, the mechanical properties of the alloy in the aging state reach 350Mpa, but the elongation is only 0.4%, which seriously restricts the practical application of aluminum-lithium alloys

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  • Lightweight high-strength cast aluminum-lithium alloy and preparation method thereof

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Embodiment 1

[0035] This embodiment relates to a light-weight and high-strength cast aluminum-lithium alloy and a preparation method thereof. The preparation method is specifically:

[0036] (1) Prepare the Al-Li master alloy containing 9.8~11wt% Li, the Al-Cu master alloy containing 49~50wt% Cu, the Al-Zr master alloy containing 4~5wt% Zr, containing 4.8~5.2wt% Ti Al-Ti-B master alloys, Al-Mn master alloys containing 8.9-10.6wt% Mn, Al-Ce master alloys containing 28-30wt% Ce, pure zinc with an impurity content of ≤0.4wt%, and the balance being pure Magnesium and pure aluminum;

[0037] (2) Preheat pure aluminum, pure magnesium, pure zinc, intermediate alloys Al-Cu, Al-Zr, Al-Ti, Al-Mn, Al-Ce to 180 °C, and the intermediate alloy Al-Li will be added to the aluminum melt Preheat for 30 minutes in front of the body, and then put pure aluminum into a graphite crucible to melt;

[0038] (3) After the aluminum ingot is melted, add the Al-Cu master alloy at 750°C. After the temperature of the...

Embodiment 2

[0049] This embodiment relates to a light-weight and high-strength cast aluminum-lithium alloy and a preparation method thereof. The preparation method is specifically:

[0050] (1) Prepare the Al-Li master alloy containing 9.8~11wt% Li, the Al-Cu master alloy containing 49~50wt% Cu, the Al-Zr master alloy containing 4~5wt% Zr, containing 4.8~5.2wt% Ti Al-Ti-B master alloys, Al-Mn master alloys containing 8.9-10.6wt% Mn, Al-Ce master alloys containing 28-30wt% Ce, pure zinc with an impurity content of ≤0.4wt%, and the balance being pure Magnesium and pure aluminum;

[0051] (2) Preheat pure aluminum, pure magnesium, pure zinc, and intermediate alloys Al-Cu, Al-Zr, Al-Ti, Al-Mn, Al-Ce to 200°C, and the intermediate alloy Al-Li will be added to the aluminum melt Preheat for 30 minutes in front of the body, and then put pure aluminum into a graphite crucible to melt;

[0052] (3) After the aluminum ingot is melted, add the Al-Cu master alloy at 760°C. After the temperature of ...

Embodiment 3

[0062] This embodiment relates to a light-weight and high-strength cast aluminum-lithium alloy and a preparation method thereof. The preparation method is specifically:

[0063] (1) Prepare the Al-Li master alloy containing 9.8~11wt% Li, the Al-Cu master alloy containing 49~50wt% Cu, the Al-Zr master alloy containing 4~5wt% Zr, containing 4.8~5.2wt% Ti Al-Ti-B master alloys, Al-Mn master alloys containing 8.9-10.6wt% Mn, Al-Ce master alloys containing 28-30wt% Ce, pure zinc with an impurity content of ≤0.4wt%, and the balance being pure Magnesium and pure aluminum;

[0064] (2) Preheat pure aluminum, pure magnesium, pure zinc, and intermediate alloys Al-Cu, Al-Zr, Al-Ti, Al-Mn, Al-Ce to 190°C, and the intermediate alloy Al-Li will be added to the aluminum melt Preheat for 30 minutes in front of the body, and then put pure aluminum into a graphite crucible to melt;

[0065] (3) After the aluminum ingot is melted, add the Al-Cu master alloy at 755°C. After the temperature of ...

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Abstract

The invention discloses a light-weight and high-strength cast aluminum lithium alloy and a preparation method thereof. The alloy consists of Li, Cu, Mg, Zn, Zr, Ti, Mn, Ce and impurity elements in specific percentages by weight as well as the balance of Al. During preparation, an aluminum alloy is obtained by smelting Al-Li, Al-Cu, Al-Zr, Al-Ti-B, Al-Mn, Al-Ce intermediate alloy, pure aluminum, pure Zn and Pure Mg, and then is subjected to two-stage solid solution heat treatment of 400-450 DEG C / 8-10h and 510-540 DEG C / 20-28h, and one-stage aging treatment of (120-190) DEG C* (30-48) h is carried out after hardening treatment to obtain the light-weight and high-strength cast aluminum lithium alloy. The mechanical properties such as room temperature strength, hardness, rigidity and breaking tenacity of the prepared aluminum lithium alloy are superior to those of a traditional business aluminum alloy, and the aluminum lithium alloy is also low in cost.

Description

technical field [0001] The invention belongs to the field of metal materials and metallurgy; in particular, it relates to a light-weight high-strength cast aluminum-lithium alloy and a preparation method thereof. Background technique [0002] Adding lithium to aluminum alloy can increase the elastic modulus of the alloy while reducing the density of the alloy. Studies have shown that adding 1wt% Li to aluminum alloy can reduce the density of the alloy by 3%, while the modulus of elasticity increases by 6%, and the alloy has a good hardening effect after solid solution and aging. Therefore, Al-Li alloy, as an aluminum alloy with low density, high elastic modulus, high specific strength and high specific stiffness, has shown broad application prospects in the aerospace field. Among many types of aluminum-lithium alloys, deformed aluminum-lithium alloys are widely used in aerospace and other fields due to their high strength and good plasticity. However, deformed aluminum-lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C21/18C22C1/03C22C1/06C22F1/04C22F1/057
CPCC22C1/026C22C1/03C22C1/06C22C21/00C22C21/16C22C21/18C22F1/04C22F1/057
Inventor 陈安涛张亮吴国华李艳磊莫文飞魏广玲
Owner SHANGHAI JIAOTONG UNIV
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