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材料工程  2013 

新型高强Al-Zn-Mg-Cu合金的热变形行为和热加工图

DOI: 10.3969/j.issn.1001-4381.2013.01.004, PP. 16-20

Keywords: Al-Zn-Mg-Cu合金,流变应力,动态回复,热加工图

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Abstract:

采用热力模拟实验方法进行热压缩变形实验,研究了一种新型Al-Zn-Mg-Cu高强铝合金铸态组织在变形温度为300~450℃,应变速率为10-3~10s-1,压缩变形量为50%条件下的热变形行为,建立了该合金的热加工图。变形温度和应变速率对该合金流变应力的影响显著;实验参数条件下,该合金流变应力曲线呈现稳态动态回复型曲线特征。热加工图和组织分析表明当应变较小时(ε=0.1),合金具备铸态组织特征,合适的热加工参数350~450℃,应变速率10-3~10-2s-1;当应变较大时(ε=0.5),合金具备锻态组织特征,较佳的热加工参数300~450℃,应变速率10-3~10-1s-1。

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