Al-6.1Zn-2.8Mg-1.9Cu-0.25Cr合金的热压缩变形行为Deformation behavior of Al-6.1Zn-2.8Mg-1.9Cu-0.25Cr alloy during hot compression
夏卿坤,刘志义,林亮华,刘煜,许晓嫦,陈旭
摘要(Abstract):
在Gleeble-1500热模拟试验机上对Al-6.1Zn-2.8Mg-1.9Cu-0.25Cr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0.01~1 s-1条件下的流变行为,建立合金高温变形的本构方程,采用TEM分析变形过程中合金的组织特征。结果表明:合金变形抗力随变形温度的升高而下降,随应变速率升高而增大。在360~400℃范围内变形时,合金组织仅发生动态回复,当变形温度高于400℃以后,合金热变形以动态再结晶为主。应变速率在0.01~1 s-1范围内,不影响合金的变形软化机制,但对合金亚结构的影响较大,随应变速率的增加,位错密度增加,亚晶尺寸减少。此合金适宜的变形条件为变形温度380~400℃、应变速率0.1 s-1。
关键词(KeyWords): Al-6.1Zn-2.8Mg-1.9Cu-0.25Cr合金;热压缩变形;本构关系
基金项目(Foundation): 国家“973”重点基础研究发展项目(2005CB623705-04);; 长沙市科技计划项目(K110707-11);; 省重点建设学科资助
作者(Author): 夏卿坤,刘志义,林亮华,刘煜,许晓嫦,陈旭
DOI: 10.13289/j.issn.1009-6264.2013.02.022
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