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Al-Er-Zr-Si aluminum alloy and heat treatment process

An alloy and process technology, which is applied in the field of Si-containing Al-Er-Zr alloy and heat treatment process, can solve the problem of high price, achieve the effects of increasing strength, reducing cost, and improving the effect of aging strengthening

Active Publication Date: 2013-08-07
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the price of Er is cheaper than Sc, Er is a rare earth element, and its price is still higher than that of general alloying elements.

Method used

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  • Al-Er-Zr-Si aluminum alloy and heat treatment process
  • Al-Er-Zr-Si aluminum alloy and heat treatment process
  • Al-Er-Zr-Si aluminum alloy and heat treatment process

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Embodiment

[0011] Example: Al99.99 high-purity aluminum is selected, and the contents of Al-Zr, Al-Er and Al-Si master alloys are 4%, 6% and 40% (mass ratio) respectively. First melt pure aluminum, after the pure aluminum is melted, put into the intermediate alloy, the melting temperature is 780 ℃ ~ 800 ℃, let it stand for 30 minutes after reaching the melting temperature, and then cast in an iron mold. The composition of the prepared alloy elements is shown in Table 1.

[0012] The ingot of the alloy with the above composition was cold-rolled, then kept at 640±10°C for 48 hours, water quenched to room temperature, aged at 150-500°C at intervals of 25°C for 2 hours, and then tested for microhardness. figure 1 is the change curve of microhardness with temperature in the isochronous process of Al-0.05Er-0.3Zr-xSi alloy; figure 2 is the change curve of microhardness with temperature in the isochronous process of Al-0.07Er-0.2Zr-xSi alloy;

[0013] Table 1 example experimental alloy compos...

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Abstract

The invention relates to an Al-Er-Zr-Si aluminum alloy and a heat treatment process and belongs to the technical field of metal alloys. The Al-Er-Zr-Si aluminum alloy contains the following components in percentage by weight: 0.05-0.07 percent of Er, 0.2-0.3 percent of Zr and 0.062-0.16 percent of Si. The heat treatment process comprises the following steps of: carrying out solid solution for 48 hours at 640+ / -10 DEG C, then carrying out water quenching to room temperature, then carrying out isochronous aging between 150 DEG C and 550 DEG C, wherein the time interval is 2 hours. Relative to a Si-free Al-Er-Zr alloy, the Al-Er-Zr-Si aluminum alloy has the peak hardness improved by about 25 percent.

Description

technical field [0001] The invention belongs to the technical field of metal alloys, and in particular relates to a Si-containing Al-Er-Zr alloy and a heat treatment process. Background technique [0002] Microalloying is a way to improve the comprehensive properties of aluminum alloys. Although the addition of microalloying elements is generally less than 0.5wt.%, this also greatly improves the overall performance of the aluminum alloy. Among them, the micro-alloying effect of Sc element is the most significant, and Sc can form nano-phase Al with Al. 3 Sc, when compounded with Zr, can also form a nanophase Al with better thermal stability 3 (Sc, Zr), they can effectively improve the strength, recrystallization temperature, creep resistance and other properties of aluminum alloy. However, Sc is expensive, which limits its industrial application. Er element is another effective microalloying element discovered in recent years, similar to Sc, it can form Al with Al 3 Er, ...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22F1/04
Inventor 聂祚仁张义高坤元黄晖文胜平朱兆玮
Owner BEIJING UNIV OF TECH
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