摘要
基于Gleeble-3500热模拟试验机,以AA6111铝合金板材为试验材料,在变形温度为425℃~525℃范围内、应变速率为0.01/s~1.0/s范围内进行了的高温拉伸测试,获得了材料在高温下的真应力-应变曲线.对拉断后的试样进行组织分析,阐述了不同变形条件下AA6111铝合金的组织对其高温流变行为的影响.研究结果表明:在高温下,AA6111铝合金的成形性随温度的升高而降低,随应变速率的增大而增大;采用改进的Arrhenius方程及Zerilli-Armstrong模型构建以温度、应变、应变速率为变量的AA6111铝合金流变应力本构模型,通过参数拟合计算,实验数据与模型计算结果吻合较好.
Based on Gleeble-3500 thermal simulation testing machine,AA6111 aluminum alloy plate was used as the test material. The high temperature tensile test was carried out in the deformation temperature range of 425 ℃-525 ℃ and the strain rate range of 0. 01/s-1. 0/s,the true stress-strain curve of the material at high temperature was obtained. The microstructures of the samples after fracture were analyzed. The effect of microstructure on high temperature rheological behavior of AA6111 aluminum alloy under different deformation conditions was described. The results show that the formability of AA6111 aluminum alloy decreases with the increase of temperature and increases with the increase of strain rate at high temperature. The improved Arrhenius equation and Zerilli-Armstrong model are used to construct the flow stress constitutive model of AA6111 aluminum alloy with temperature,strain and strain rate as variables. Through parameter fitting calculation,the test data are in good agreement with the model calculation results.
作者
黄鸣东
吴浩
王立娟
刘成
HUANG Ming-dong;WU Hao;WANG Li-juan;LIU Cheng(Chinalco Materials&Application Research Institute Co.,Ltd,Beijing 102200,China)
出处
《轻合金加工技术》
CAS
2021年第2期45-50,54,共7页
Light Alloy Fabrication Technology
基金
北京市科委项目(Z191100004619005)
关键词
AA6111铝合金
热冲压
热拉伸
流变行为
高温本构模型
AA6111 aluminum alloy
hot stamping
hot drawing
rheological behavior
high temperature constitutive model
作者简介
第一作者:黄鸣东(1988-),男,安徽人,工程师,博士。
