Effect of Hot Rolled Reduction on Microstructure and Mechanical Properties of 7055 Aluminium Alloy

Li Zhoubing1; Yan Liangming2; Shen Jian3

doi:10.15980/j.tzzz.2013.01.006

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Effect of Hot Rolled Reduction on Microstructure and Mechanical Properties of 7055 Aluminium Alloy
Vol. 33, Issue 1, Pages: 1-4(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.01.006

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[1]李周兵,闫亮明,沈健.热轧变形量对7055铝合金组织与力学性能的影响[J].特种铸造及有色合金,2013,33(01):1-4.

Li Zhoubing1, Yan Liangming2, Shen Jian3. Effect of Hot Rolled Reduction on Microstructure and Mechanical Properties of 7055 Aluminium Alloy. [J]. Special Casting & Nonferrous Alloys 33(1):1-4(2013)
[1]李周兵,闫亮明,沈健.热轧变形量对7055铝合金组织与力学性能的影响[J].特种铸造及有色合金,2013,33(01):1-4. DOI： 10.15980/j.tzzz.2013.01.006.

Li Zhoubing1, Yan Liangming2, Shen Jian3. Effect of Hot Rolled Reduction on Microstructure and Mechanical Properties of 7055 Aluminium Alloy. [J]. Special Casting & Nonferrous Alloys 33(1):1-4(2013) DOI： 10.15980/j.tzzz.2013.01.006.

摘要

采用Gleeble-1500D热模拟试验机对7055铝合金进行了热压缩试验

利用OM和EBSD方法分析在不同变形量下热压缩试样的组织特征

观察合金在热处理后的金相组织形貌并进行力学性能测试

研究了变形量对7055铝合金显微组织和力学性能的影响。结果表明

变形量显著影响7055铝合金的热变形组织。随着变形量的增加

晶粒被显著拉长

晶界处的粗大第二相沿晶界被拉长

甚至被破碎。7055铝合金局部发生动态再结晶

应变诱发晶界迁移为主要的动态再结晶机制。7055铝合金热处理后的再结晶体积分数越小

包含亚结构的未再结晶组织多时

有利于合金获得较高的力学性能

变形量达到79%时

综合力学性能最佳。

Abstract

The hot compression simulation of 7055 aluminum alloy was carried out on the Gleeble-1500D thermal simulator.The characteristics of hot compressive structure under different reductions was observed by OM and EBSD.The mechanical properties after heat treatment were tested

and the effects of hot deformation reduction on the microstructure and mechanical properties of 7055 aluminum alloy were investigated.The experimental results indicate that with the increase of reduction

the grains are significantly elongated

and the coarse second phase are stretched along the grain boundaries

and even broken up.Dynamic recrystallization locally occurrs in 7055 aluminum alloy

which is attributed to strain-induced grain boundary migration.With the decrease of the volume fraction of recrystallization and the increase of grain contained sub-structure in 7055 aluminum alloy after heat treatment

mechanical properties of the alloys are improved greatly.The optimum mechanical properties can be obtained with the 79%reduction.