Characterization of Flow Behavior and Microstructural Evolution of 7050 Aluminum Alloy during Hot Compression Process

Chen Xiufan; Peng Xiaoyan; Zhang Huiying; Xiao Dan; Wang Hengyu; Xu Guofu

doi:10.15980/j.tzzz.2015.12.002

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Characterization of Flow Behavior and Microstructural Evolution of 7050 Aluminum Alloy during Hot Compression Process
Vol. 35, Issue 12, Pages: 1237-1242(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.12.002

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[1]陈修梵,彭小燕,张慧颖,肖丹,王恒玉,徐国富.7050铝合金热压缩变形的流变行为及微观组织演变[J].特种铸造及有色合金,2015,35(12):1237-1242.

Chen Xiufan, Peng Xiaoyan, Zhang Huiying, et al. Characterization of Flow Behavior and Microstructural Evolution of 7050 Aluminum Alloy during Hot Compression Process. [J]. Special Casting & Nonferrous Alloys 35(12):1237-1242(2015)
[1]陈修梵,彭小燕,张慧颖,肖丹,王恒玉,徐国富.7050铝合金热压缩变形的流变行为及微观组织演变[J].特种铸造及有色合金,2015,35(12):1237-1242. DOI： 10.15980/j.tzzz.2015.12.002.

Chen Xiufan, Peng Xiaoyan, Zhang Huiying, et al. Characterization of Flow Behavior and Microstructural Evolution of 7050 Aluminum Alloy during Hot Compression Process. [J]. Special Casting & Nonferrous Alloys 35(12):1237-1242(2015) DOI： 10.15980/j.tzzz.2015.12.002.

摘要

利用Gleeble-1500热模拟试验机对均匀化7050铝合金在573

23℃和0.000 5

s-1变形条件下进行热压缩试验。通过线性回归分析计算出均匀化7050铝合金的应变硬化指数以及变形激活能

获得了均匀化7050铝合金热压缩变形条件下的流变应力本构方程。并借助扫描电镜（SEM）、电子背散射衍射（EBSD）和透射电镜（TEM）显微分析

对不同热变形条件下合金的微观组织演变进行研究。结果表明

均匀化7050铝合金在高温压缩变形过程中有动态回复和动态再结晶现象。随着变形温度升高和应变速率下降

合金位错密度降低

流变应力减小。在热变形过程中

合金的主要软化机制由动态回复逐渐演变为动态再结晶

热变形组织由位错亚结构转变为再结晶组织。

Abstract

Hot compression test of homogenized 7050 aluminum alloy was carried out on the Gleed-1500 thermal simulation machine at 573

23℃and 0.000 5

s-1.The strain hardening coefficient and deformation activation energy of 7050 aluminum alloy were evaluated by linear regression analysis.And the flow stress constitutive equation of 7050 aluminum alloy during hot compression process was presenetd.The microstructure evolution of the alloy under different deformation conditions was observed using optical microscope（OM）

electron back scattered diffraction（EBSD）and transmission electron microscope（TEM）.The results reveal that dynamic recovery and dynamic recrystallization phenomenon can be observed during hot compression deformation process.And with increasing in the deformation temperature or decreasing in the strain rates

the flow stress and the dislocation density of homogenized7050 aluminum are decreased.The main softening mechanism of the alloy is characterized by from dynamic recovery to dynamic recrystallization during deformation.Correspondingly

microstructure is transformed from substructure of dislocation to recrystallized structure.