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Preparation method of high-strength aluminum alloy and high-strength aluminum alloy

A technology of aluminum alloy and aluminum intermediate alloy, which is applied in the field of metal materials to achieve the effects of mature melting process, reduction of hot cracking tendency and strong versatility

Pending Publication Date: 2022-06-03
WEIHAI WANFENG MAGNESIUM IND DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the shortcomings of the mechanical properties of the existing die-casting AlSi10MnMg aluminum alloy, and provides a high-strength aluminum alloy containing Sr and Ti and its preparation method

Method used

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  • Preparation method of high-strength aluminum alloy and high-strength aluminum alloy
  • Preparation method of high-strength aluminum alloy and high-strength aluminum alloy
  • Preparation method of high-strength aluminum alloy and high-strength aluminum alloy

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preparation example Construction

[0022] A second aspect of the present invention provides a method for preparing a high-strength aluminum alloy, comprising the following steps:

[0023] After the aluminum alloy master alloy ingot is melted in the furnace, the Al10Sr and AlTi5CB master alloy ingots are added into the melt, and the addition amount of the AlTi5CB master alloy is 1-2% of the total weight of the master alloy ingot; stirring, drying and nitrogen blowing for 10 minutes , the temperature is kept at 720-740 ℃; after standing for 10-20 minutes, pour in the metal mold to obtain the casting;

[0024] Wherein, the aluminum alloy master alloy ingot is AlSi10MnMg alloy, and the weight percentage of each constituent element in the AlSi10MnMg alloy is: 9.5-11.5% wt Si, 0.35-0.45% wt% Mg, 0-0.15% wt% % Fe, 0-0.03% wt% Cu, 0-0.05% wt% Zn, 0.5-0.8% wt% Mn, 0.04-0.09% wt% Ti, 0.014-0.02% wt% Sr, rest The amount is Al.

[0025] In the present invention, the preparation method further includes the step of preheat...

Embodiment 1

[0033] As shown in Table 1 below, industrial AlSi10MnMg alloy is selected as the master alloy, the alloy is preheated to 150°C, the temperature is raised to 720°C, and the Al10Sr and Al-5Ti-C-B master alloys are preheated and directly added to the melt, and mixed with stirring. Evenly, let it stand for 10 minutes, and then pour it in a metal mold; the castings after pouring are subjected to solution treatment at 545°C × 3h and aging treatment at 160°C × 6.5h in a resistance furnace.

[0034]The mechanical properties of the obtained castings are shown in Table 2 below:

[0035] The room temperature tensile strength is 289.6MPa, the yield strength is 258.9MPa, and the elongation is 9.5%.

Embodiment 2

[0037] As shown in Table 1 below, industrial AlSi10MnMg alloy is selected as the master alloy, the alloy is preheated to 180°C, the temperature is raised to 720°C, the Al10Sr and Al-5Ti-C-B master alloys are preheated and directly added to the melt, and mixed with stirring. Evenly, let it stand for 15 minutes, and then pour it in a metal mold; the castings after pouring are subjected to solution treatment at 545°C × 4h and aging treatment at 160°C × 6.5h in a resistance furnace.

[0038] The mechanical properties of the obtained castings are shown in Table 2 below:

[0039] The room temperature tensile strength is 295.8MPa, the yield strength is 264.7MPa, and the elongation is 10.8%.

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Abstract

The invention discloses a preparation method of a high-strength aluminum alloy and the high-strength aluminum alloy, after an aluminum alloy master alloy ingot is melted in a smelting furnace, Al10Sr and an AlTi5CB intermediate alloy ingot are added into the melt, and the addition amount of the AlTi5CB intermediate alloy is 1-2% of the total weight of the master alloy ingot; stirring, introducing dry nitrogen, blowing for 10 minutes, and keeping the temperature at 720-740 DEG C; and after standing for 10-20 minutes, pouring in a metal mold to obtain a casting. According to the high-strength aluminum alloy provided by the invention, the strength of the aluminum alloy is improved and the plasticity index of the aluminum alloy is ensured by adding the elements of Sr, Ti, C and B into the alloy, controlling the contents of Fe, Cu and Zn at a low level and properly increasing the content of Mg; the added C and B elements can form dispersed TiBC particles in a melt, heterogeneous nucleation of a matrix can be promoted, an alloy structure is refined, the secondary dendritic crystal spacing in the structure is reduced, the mechanical property index of the alloy is remarkably improved, and the problem that the refining and strengthening effect is affected due to lattice distortion caused by the fact that Si is dissolved in TiAl3 can be effectively solved.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a high-strength aluminum alloy and a preparation method thereof. Background technique [0002] Modern society has higher and higher requirements for low-emission, light-weight and high-efficiency vehicles, which makes the world's major automakers focus a lot of attention on the development and application of high-performance light alloy materials. According to statistics, if A 10% reduction in the car's own weight can reduce fuel consumption by 8% and corresponding emissions by 4%. Therefore, lightweight is an effective way to save energy and reduce harmful gas emissions, and it is an inevitable trend in the development of the automobile industry, and aluminum alloy materials are the preferred materials for lightweight automobiles in today's society. Aluminum alloy has a series of excellent characteristics such as low density, good fluidity, high specific strength, hig...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/10
CPCC22C21/04C22C1/1036C22C1/1073
Inventor 王远峰刘旦朱训明宋文军于日和段军鹏毕丽伟
Owner WEIHAI WANFENG MAGNESIUM IND DEV
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