Effects of Rare Earth Er and Retrogression and Re-Aging Treatment on Microstructure and Properties of 7075 Aluminum Alloy

Zhao Jun; Liu Zhiyong; Liu Qiuping; Zhu Xinbing; Wang Mingxing; Liu Zhongxia

doi:10.15980/j.tzzz.2014.06.032

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Effects of Rare Earth Er and Retrogression and Re-Aging Treatment on Microstructure and Properties of 7075 Aluminum Alloy
Vol. 34, Issue 6, Pages: 666-669(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.06.032

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[1]赵俊,刘志勇,刘秋平,朱心冰,王明星,刘忠侠.稀土Er及回归热处理对7075铝合金组织和性能的影响[J].特种铸造及有色合金,2014,34(06):666-669.

Zhao Jun, Liu Zhiyong, Liu Qiuping, et al. Effects of Rare Earth Er and Retrogression and Re-Aging Treatment on Microstructure and Properties of 7075 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 34(6):666-669(2014)
[1]赵俊,刘志勇,刘秋平,朱心冰,王明星,刘忠侠.稀土Er及回归热处理对7075铝合金组织和性能的影响[J].特种铸造及有色合金,2014,34(06):666-669. DOI： 10.15980/j.tzzz.2014.06.032.

Zhao Jun, Liu Zhiyong, Liu Qiuping, et al. Effects of Rare Earth Er and Retrogression and Re-Aging Treatment on Microstructure and Properties of 7075 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 34(6):666-669(2014) DOI： 10.15980/j.tzzz.2014.06.032.

摘要

采用铸锭冶金法制备了Er含量为0.30%的7075铝合金

用金相显微镜、扫描电镜和能谱分析等分析了Er的加入和回归热处理工艺对合金显微组织的影响

并研究了其力学性能。结果表明

加入Er后合金晶粒明显细化

T6状态下合金抗拉强度为585MPa

屈服强度为528MPa

伸长率为8.5%

质量系数为724

较不含Er的合金分别提高了2.63%、2.33%、21.43%和3.87%;含Er的合金经优化后的回归热处理（120℃×16h+180℃×10min+120℃×16h）后

抗拉强度为645MPa

屈服强度为603MPa

伸长率为11%

质量系数为801

较T6状态下含Er合金提高了10.26%、14.20%、29.41%和10.64%。

Abstract

7075 aluminum alloys containing erbium（mass fraction 0.30%）were prepared by ingot metallurgy method.Effects of adding erbium and the retrogression and re-aging（RRA）treatment process on microstructure of the alloy were analyzed by optical microscopy

scanning electron microscopy and spectroscopy

and the mechanical properties were also examined to optimize the heat treatment.The results show that with 0.30% Er addition

the grain sizes of alloy are refined greatly.After T6aging treatment

the tensile strength and yield strength of the alloy reach 585 MPa and 528 MPa

respectively

with 8.5%of elongation and 724of the quality factor.Compared with those of alloy with Er free

the above properties are improved by 2.63%

2.33%

21.43% and by 3.87%

respectively.The tensile strength and yield strength of the 7075alloy with 0.3% Er after optimized retrogression and re-aging（RRA）treatment process at 120℃for 16hand at 180℃for 10min as well as at 120℃for 16h

reach645MPa and 603MPa

respectively

with 11%of elongation and 801of the quality factor.After RRA treatment

the mechanical properties are increased dramatically.Compared with the T6treatment

the above properties are improved by 10.26%

14.20%

29.41%and by 10.64%

respectively.