摘要
利用Gleeble-3500热模拟试验机对Al-Mg-Si-Sc-Zr合金在真应变为0. 5及不同的应变速率与变形温度的条件下进行热压缩实验,得到了高温下合金的真应力-真应变曲线,分析了应力与应变速率和变形温度之间的关系。通过对实验数据的回归分析,得到合金的本构方程以及含Z的本构方程;此外,建立了真应变为0. 5时合金的热加工图。结果表明:温度为500~540℃、应变速率为0. 05~1 s^-1和温度为440~470℃、应变速率为0. 01~0. 02 s^-1时是合金的最佳加工区域;高温高应变速率区(480~540℃,应变速率:1. 65~10 s^-1)为合金的失稳区域,在实际加工过程应尽量避免。
The hot compression experiments of Al-Mg-Si-Sc-Zr alloy under the condition of real strain of 0. 5 and different strain rates and deformation temperatures were carried out by using Gleeble-3500 thermal simulation tester,and the true stress-true strain curves of the Al-Mg-Si-Sc-Zr alloy at high temperature were obtained. The relationship between the stress and strain rate and the deformation temperature was analyzed. Through the regression analysis of the experimental data,the constitutive equation of the alloy and the constitutive equation containing Z were obtained,and the hot processing map of the alloy was established when the true strain was 0. 5. The results show that the optimum processing zone of the alloy is that the temperature is 500-540 ℃,the strain rate is 0. 05-1 s^-1,and the temperature is 440- 470 ℃,the strain rate is 0. 01-0. 02 s^-1 . The high temperature( 480-540 ℃) and high strain rate( 1. 65-10 s^-1 ) zone is the unstable zone of the alloy,which should be avoided as far as possible in the actual processing process.
作者
李明
李亨
徐圆义
罗志勇
石文超
吴玉程
LI Ming;LI Heng;XU Yuan-yi;LUO Zhi-yong;SHI Wen-chao;WU Yu-cheng(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009, China;Institute of Industry and Equipment Technology,Hefei University of Technology, Hefei 230009,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第10期143-150,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金青年基金(51605128)
