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5083合金高温变形行为及加工图

Journal of Central South University(Science and Technology)(2017)

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Abstract
采用Gleeble-3800热模拟机对5083铝合金进行高温等温压缩实验,研究该合金在变形温度为300~500℃、应变速率为0.01~10.0 s-1条件下的流变行为,建立合金高温变形的本构方程和加工图,采用电子背散射衍射(EBSD)分析变形过程中合金的组织特征.研究结果表明;流变应力随变形温度升高而降低,随应变速率增大而升高;当变形温度为400~500℃时,合金发生动态再结晶;5083铝合金的高温流变行为可用Zener-Hollomon参数描述,该合金在真应变为0.6时的加工图中存在2个失稳区域,其优选的加工条件是变形温度为420~500℃,应变速率为0.01~0.10 s1.
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Key words
5083 aluminum alloy,hot deformation,constitutive equations,processing map
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