热处理对Al-11Si-2.5Cu-Mg合金组织及性能的影响

上官晶晶; 刘伟; 刘云

doi:10.15980/j.tzzz.2017.03.027

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热处理对Al-11Si-2.5Cu-Mg合金组织及性能的影响
Effect of Heat Treatment on Microstructure and Properties of the Al-11Si-2.5Cu-Mg Aluminum Alloy
2017年37卷第3期页码：335-337
纸质出版日期： 2017 ，
DOI： 10.15980/j.tzzz.2017.03.027

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[1]上官晶晶,刘伟,刘云.热处理对Al-11Si-2.5Cu-Mg合金组织及性能的影响[J].特种铸造及有色合金,2017,37(03):335-337.

Shangguan Jingjing, Liu Wei, Liu Yun. Effect of Heat Treatment on Microstructure and Properties of the Al-11Si-2.5Cu-Mg Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2017,37(3):335-337.
[1]上官晶晶,刘伟,刘云.热处理对Al-11Si-2.5Cu-Mg合金组织及性能的影响[J].特种铸造及有色合金,2017,37(03):335-337. DOI： 10.15980/j.tzzz.2017.03.027.

Shangguan Jingjing, Liu Wei, Liu Yun. Effect of Heat Treatment on Microstructure and Properties of the Al-11Si-2.5Cu-Mg Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2017,37(3):335-337. DOI： 10.15980/j.tzzz.2017.03.027.

摘要

采用金属型铸造制备Al-11Si-2.5Cu-Mg合金

利用金相显微镜及拉伸试验等方法

研究了热处理对Al-11Si-2.5Cu-Mg合金组织及性能的影响。结果表明

最佳热处理工艺为:510℃×7h固溶+160℃×8h时效

此时合金的抗拉强度和伸长率分别达到385 MPa和8.2%。经热处理后

铸态组织的点状共晶Si相被球化

大部分Si质点都比较圆整

并在α固溶体上析出细小而弥散的Al2Cu、Mg2Si中间强化相

使合金强度得到提高。

Abstract

Al-11Si-2.5Cu-Mg aluminum alloy was prepared by metal casting method.Effects of heat treatment on microstructure and properties of the alloy were investigated by means of metallurgical microscope and tensile testing.The results show that the properties of Al-11Si-2.5Cu-Mg aluminum alloy can be further improved by heat treatment.The optimized heat treatment process for the alloy is presented as follows:510 ℃×7hsolid solution+160 ℃×8haging treatment

where tensile strength and elongation of the Al-11Si-2.5Cu-Mg aluminum alloy reach 385 MPa and 8.2%

respectively.After heat treatment

eutectic silicon phase in as-cast microstructure is transformed into spherical ones

and most of fine and dispersedly Al

Cu and Mg

Si strengthening phases are precipitated fromαsolid phase

improving strength of the alloy.