弥散强化6XXX铝合金热变形行为研究

王孝国; 张孝元; 孙瑞娟; 王斌; 王嘉伟

doi:10.15980/j.tzzz.2021.09.011

研究·合金性能 | 浏览量 : 0 下载量: 34 CSCD: 0

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弥散强化6XXX铝合金热变形行为研究
Hot Deformation Behavior of Dispersion Strengthened 6XXX Al Alloy
2021年41卷第9期页码：1114-1118
纸质出版日期： 2021 ，
DOI： 10.15980/j.tzzz.2021.09.011

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王孝国, 张孝元, 孙瑞娟, 等. 弥散强化6XXX铝合金热变形行为研究[J]. 特种铸造及有色合金杂志, 2021,41(9):1114-1118.

Wang Xiaoguo, Zhang Xiaoyuan, Sun Ruijuan, et al. Hot Deformation Behavior of Dispersion Strengthened 6XXX Al Alloy[J]. Special Casting & Nonferrous Alloys, 2021,41(9):1114-1118.
王孝国, 张孝元, 孙瑞娟, 等. 弥散强化6XXX铝合金热变形行为研究[J]. 特种铸造及有色合金杂志, 2021,41(9):1114-1118. DOI： 10.15980/j.tzzz.2021.09.011.

Wang Xiaoguo, Zhang Xiaoyuan, Sun Ruijuan, et al. Hot Deformation Behavior of Dispersion Strengthened 6XXX Al Alloy[J]. Special Casting & Nonferrous Alloys, 2021,41(9):1114-1118. DOI： 10.15980/j.tzzz.2021.09.011.

摘要

对均匀化态含Mn/Cr弥散强化6XXX铝合金(WQ合金)在不同变形温度和应变速率下进行轴向热压缩试验。应用双曲正弦本构方程求得合金材料参数和激活能;基于动态材料模型获得变形合金热加工图;根据热加工图确定安全加工窗口

优化变形参数;WQ合金安全加工区域动态软化机制主要为动态回复

亚晶旋转和(亚)晶界迁移受阻于α弥散相;加工失稳区微观组织存在裂纹

主要与微孔形成和第二相开裂、脱相有关。

Abstract

The hot deformation behaviors of homogenized Mn/Cr-containing aluminum alloys denoted as WQ were investigated systematically by uniaxial compression tests at various deformation temperature and strain rates. The hyperbolic-sine constitutive equation was employed to determine the parameters and activation energies of materials. Based on dynamic material model

the processing maps of WQ alloys were also constructed to reveal safe processing domain and optimize deformation parameters. Attributed to pinning effect of α-Al（MnCr）Si dispersoids

sub-grain rotation and sub-grain boundaries migration are suppressed. Hence

the softening mechanism in WQ alloy is dominated by dynamic recovery at safe processing domain. Cracks are observed in the microstructure of the machining instability zone

which is related to micro void formation

cracks and debonding of the second phase.