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Modified A356 aluminum alloy and multi-time aging heat treatment method thereof

An aluminum alloy and modification technology, which is applied in the field of modified A356 aluminum alloy and its multiple aging heat treatment, can solve the problems of limited performance indicators, difficulty in meeting the increasingly high requirements of material performance, etc., and achieves improved strength and production cost. low cost effect

Pending Publication Date: 2018-09-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at present, the strength and other performance indicators of A356 aluminum alloy are limited, and the tensile strength after heat treatment is generally less than 240MPa, and it is difficult to effectively improve its performance by conventional means, and it is difficult to meet the increasingly high requirements of automobile lightweight for material performance

Method used

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  • Modified A356 aluminum alloy and multi-time aging heat treatment method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation process of high-performance A356 aluminum alloy is as follows:

[0050] 1. Allocation of raw materials according to the target composition;

[0051]Weigh pure Al according to the mass percentage of 6.5% Si, 0.25% Mg, 0.10% Ti, 0.10% Zr, and 0.02% Sr in the alloy, Al-Si master alloy, Al-Mg master alloy, Al-Zr Master alloy, Al-Ti master alloy and Al-Sr master alloy.

[0052] 2. Melting and casting

[0053] (1) Add the Al-Si master alloy prepared and weighed in step 1 into a crucible preheated at 300°C, then raise the temperature to 730°C with the furnace, wait for it to completely melt, let it stand and keep it warm for 25 minutes.

[0054] (2) Add the Al-Mg master alloy, Al-Ti master alloy and Al-Zr master alloy prepared in step 1 into the melted alloy melt, wait until they are all melted, let stand and keep warm at 720°C for 15min, let stand After the end, add the weighed Al-Sr master alloy for modification treatment, fully stir and keep the heat for ...

Embodiment 2

[0064] In Examples 2 and 3, the content of Si element is increased to 7%, and the content of Mg element is increased to 0.25% and 0.30%, forming more finely dispersed Mg 2 Si phase, Zr element content and Ti element content are increased to 0.15%, 0.20% and 0.30% respectively, and grain refinement effect is obvious, therefore adopt " CZ-8000A electronic universal testing machine " to measure the resistance of the sample that embodiment 2 makes The tensile strength reached 302MPa, and the hardness of the sample was tested with a THBS-3000DS Brinell hardness tester, and the Brinell hardness was 101HBW. The tensile strength of the sample obtained in Example 3 reached 319MPa, and the Brinell hardness reached 105HBW. In Examples 2 and 3, the content of Sr element is increased to 0.04% and 0.06% respectively, and the effect of changing the distribution of the eutectic silicon phase is more obvious. Therefore, the elongation of the alloy after fracture is increased to 10% and 12%, res...

Embodiment 4

[0065] In Example 4, the Si element content is increased to 7.5%, the Mg element content is increased to 0.3%, the Ti element content is increased to 0.20%, the Sr element content is increased to 0.10%, and the Zr element content is increased to 0.45%. "CZ-8000A Electronic universal testing machine "measures the tensile strength of the sample obtained in Example 2 to reach 307MPa, and uses the THBS-3000DS type Brinell hardness tester to test the sample hardness, and the Brinell hardness is 99HBW, although Si, Mg, Ti, Sr elements in the alloy However, due to the increase of Zr element content to 0.45%, a large number of coarse primary Al3Zr phases are produced in the as-cast structure of the alloy, and the strength, hardness and elongation of the alloy decrease.

[0066] The highest tensile strength of the high-performance Al-Si alloy prepared by the present invention can reach 319MPa, and the Brinell hardness generally exceeds 100HBW, obviously exceeding the mechanical properti...

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Abstract

The invention discloses modified A356 aluminum alloy and a multi-time aging heat treatment method thereof. On the basis of components of traditional A356 aluminum alloy, microscale Zr and Sr elementsare added during smelting for conducting grain refinement and modification on a melt, an ingot is obtained through smelting and casting, and then the ingot is subjected to solid solution treatment andmulti-time aging T6 heat treatment to prepare the high-performance A356 aluminum alloy. Compared with A356 aluminum alloy produced by an existing traditional technology, the high-performance A356 aluminum alloy prepared by the technology has the advantages that the mechanical property is remarkably improved, the preparation method is simple, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of metal materials and preparation, and in particular relates to a modified A356 aluminum alloy and a multiple aging heat treatment method thereof. Background technique [0002] As my country's basic national conditions have gradually changed from backward productivity to unbalanced and insufficient development, people's research direction on science and technology has gradually changed to more economical and efficient aspects. Cars, airplanes and other means of transportation commonly used in our daily life are developing in the direction of lightweight. [0003] Among the few lightweight materials, aluminum has gradually become the most widely used lightweight metal material in various industries due to its unique performance characteristics. As a typical Al-Si-Mg cast aluminum alloy, A356 aluminum alloy will not tend to crack or break due to the high temperature environment during the casting process. It...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03C22C1/06C22F1/043
Inventor 杜晓东葛海涛陆雨雷璇璇董浩
Owner HEFEI UNIV OF TECH
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