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Cast aluminum alloy of high-strength high-toughness thin-wall structural member and preparation method thereof

A technology for casting aluminum alloys and structural parts, applied in the field of aluminum alloy processing, can solve the problems of high strength and high toughness, easy fatigue cracking, and low toughness.

Active Publication Date: 2019-08-16
ZHUHAI RUNXINGTAI ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, Al-Si-Cu series (domestic YL112, YL113, Japan ADC12, ADC10, US A380, etc.), Al-Si-Mg series (domestic YL104, Japan ADC3, US A360, etc.) are widely used at home and abroad. Conventional non-vacuum die-casting ( Aluminum alloys generally have a tensile strength of 220-240MPa and an elongation of ≤3%, which is far from meeting the performance requirements of high strength and high toughness, especially poor toughness, fatigue cracking during service, and low toughness

Method used

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  • Cast aluminum alloy of high-strength high-toughness thin-wall structural member and preparation method thereof
  • Cast aluminum alloy of high-strength high-toughness thin-wall structural member and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The content of each component of cast aluminum alloy for high-strength and tough thin-walled structural parts is expressed in weight percentage as follows: Al 96.73%, Si 3.00%, Mg 0.10%, Mn 0.10%, Sr 0.01%, B 0.01%, Ti 0.05%. The preparation method of the cast aluminum alloy of the high-strength and tough thin-walled structural part comprises the following steps:

[0047] 1S ingredients: Al-20Si alloy, 99.95% magnesium ingot, 99.8% aluminum ingot, Al-10Ti alloy, Al-40Mn alloy, Al-10Sr alloy, Al-5Ti-1B alloy, iron source are selected according to the above composition 99.95% iron powder or aluminum-iron master alloy;

[0048] 2S smelting and die-casting: Add the raw materials obtained in step 1S into the induction melting furnace, vacuumize, pass argon, and melt at a temperature of 730-760°C to obtain a melt solution; use mechanical stirring method, stir for 8-10min , cast into ingots;

[0049] 3S homogenization: the ingot obtained in step 2S is subjected to homogeniza...

Embodiment 2

[0053] The content of each component of cast aluminum alloy for high-strength and tough thin-walled structural parts is expressed in weight percentage as follows: Al86.98%, Si 10.00%, Mg 1.00%, Mn 1.00%, Sr 0.10%, B 0.12%, Ti 0.20%, Fe 0.60%. The preparation method of the cast aluminum alloy of the high-strength and tough thin-walled structural part comprises the following steps:

[0054] 1S ingredients: Al-20Si alloy, 99.95% magnesium ingot, 99.8% aluminum ingot, Al-10Ti alloy, Al-40Mn alloy, Al-10Sr alloy, Al-5Ti-1B alloy, iron source are selected according to the above composition 99.95% iron powder or aluminum-iron master alloy;

[0055] 2S smelting and die-casting: Add the raw materials obtained in step 1S into the induction melting furnace, vacuumize, flow argon, and melt at a temperature of 730-760°C to obtain a melt solution; use electromagnetic stirring method, stir for 8-10min , cast into ingots;

[0056] 3S homogenization: the ingot obtained in step 2S is subject...

Embodiment 3

[0060] The content of each component of cast aluminum alloy for high-strength and tough thin-walled structural parts is expressed in weight percentage as follows: Al 95.45%, Si 4.00%, Mg 0.25%, Mn 0.20%, Sr 0.01%, B 0.01%, Ti 0.08%. The preparation method of the cast aluminum alloy of the high-strength and tough thin-walled structural part comprises the following steps:

[0061] 1S ingredients: Al-20Si alloy, 99.95% magnesium ingot, 99.8% aluminum ingot, Al-10Ti alloy, Al-40Mn alloy, Al-10Sr alloy, Al-5Ti-1B alloy, iron source are selected according to the above composition 99.95% iron powder or aluminum-iron master alloy;

[0062] 2S smelting and die-casting: Add the raw materials obtained in step 1S into the induction melting furnace, vacuumize, flow argon, and melt at a temperature of 730-760°C to obtain a melt solution; use ultrasonic vibration method and stir for 8-10 minutes , cast into ingots;

[0063] 3S homogenization: the ingot obtained in step 2S is subjected to h...

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Abstract

The invention relates to the technical field of aluminum alloy processing, in particular to a cast aluminum alloy of a high-strength high-toughness thin-wall structural member and a preparation methodthereof. The aluminum alloy comprises the following components of, in percentage by weight, 86.98%-96.73% of Al, 3.00%-10.00% of Si, 0.10%-1.00% of Mg, 0.10%-1.00% of Mn, 0.01%-0.10% of Sr, 0.01%-0.12% of B, 0.05%-0.20% of Ti, and less than or equal to 0.60% of Fe; and the ratio C1 of the weight percentage is equal to B / Sr and greater than or equal to 1.00. According to the high-strength high-toughness aluminum alloy, the Ti and B elements are added to refine alpha-Al crystal grains on the basis of optimizing the main alloy elements of Si, Mg and Mn, the Sr elements are added to refine the modified eutectic Si phase, the contents of the elements and impurity elements are controlled, the elements and the impurity elements are matched with one another, so that the aluminum alloy has high strength, good toughness and excellent die-casting process performance.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to a casting aluminum alloy of a high-strength and tough thin-walled structural part and a preparation method thereof. Background technique [0002] Cast aluminum alloy parts are widely used in electrical instruments, automobiles and motorcycles, communications and other fields. With the increasingly high requirements for thin-walled and lightweight castings in the fields of automobiles and machinery, some workpieces, such as high-load and thin-walled iron structural parts in automobile bodies, are formed by aluminum alloy die casting, which requires alloys not only It should meet the conventional no thermal cracking and segregation phenomenon, and be able to fill and form thin-walled castings. It is also especially required that the castings have high strength, high elongation and high toughness after proper heat treatment. [0003] At present, Al-Si-Cu series (d...

Claims

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Application Information

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IPC IPC(8): C22C21/04B22D17/00C22C1/03C22F1/047
CPCB22D17/007C22C1/026C22C1/03C22C21/04C22F1/047
Inventor 张莹任怀德景佰亨李院斌李凯王继成鲁强冯力陈彦霖彭典明
Owner ZHUHAI RUNXINGTAI ELECTRICAL
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