Effects of Modification on Mechanical Properties and Microstructure of Al-Cu Alloy

Liu Xu; Yang Yafeng

doi:10.15980/j.tzzz.2017.09.026

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Effects of Modification on Mechanical Properties and Microstructure of Al-Cu Alloy
Vol. 37, Issue 9, Pages: 1026-1029(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.09.026

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[1]刘旭,杨亚峰.变质处理对Al-Cu合金力学性能与组织的影响[J].特种铸造及有色合金,2017,37(09):1026-1029.

Liu Xu, Yang Yafeng. Effects of Modification on Mechanical Properties and Microstructure of Al-Cu Alloy. [J]. Special Casting & Nonferrous Alloys 37(9):1026-1029(2017)
[1]刘旭,杨亚峰.变质处理对Al-Cu合金力学性能与组织的影响[J].特种铸造及有色合金,2017,37(09):1026-1029. DOI： 10.15980/j.tzzz.2017.09.026.

Liu Xu, Yang Yafeng. Effects of Modification on Mechanical Properties and Microstructure of Al-Cu Alloy. [J]. Special Casting & Nonferrous Alloys 37(9):1026-1029(2017) DOI： 10.15980/j.tzzz.2017.09.026.

摘要

采用金相显微镜（OM）、透射电镜（TEM）和拉伸力学性能测试等手段

研究了La和Pr复合变质对Al-Cu合金力学性能以及显微组织的影响

并分析了La和Pr的存在形式与作用机理。结果表明

不同时效温度下La+Pr复合变质AlCu合金的峰值硬度都要高于未变质Al-Cu合金

165℃×10h为适宜的时效热处理制度;La+Pr复合变质Al-Cu合金的常温抗拉强度和伸长率都要明显高于未变质Al-Cu合金

且0.2%的La+0.1%的Pr复合变质Al-Cu合金的室温抗拉强度和伸长率取得最大值

高温抗拉强度和伸长率都要高于相同温度下未变质Al-Cu合金

其主要强化机制为细晶强化和第二相强化。

Abstract

The effects of La and Pr composite modification on the mechanical properties and microstructure of Al-Cu alloy were investigated by OM

TEM and tensile testing

and the existing forms and mechanism of La and Pr were described.The results reveal that the peak hardness of 0.3%（La+Pr）composite modified Al-Cu alloy at different aging temperature is the higher than that of unmodified AlCu alloy

and the suitable aging treatment process is at 165℃for 10 h.The tensile strength and elongation at room temperature of La+Pr composite modified Al-Cu alloy are significantly higher than those of unmodified Al-Cu alloy

and the tensile strength and elongation reach the maximum value with 0.2%La+0.1%Pr composite modification on Al-Cu alloy

In addition

the tensile strength and elongation at high temperature are the higher than that of unmodified Al-Cu alloy at the same temperature.The main strengthening mechanism of 0.2%La+0.1%Pr composite modified Al-Cu alloy belongs to fine grain strengthening and second phase strengthening.