摘要
在变形温度为440、460和480℃,应变速率为0. 001、0. 01和0. 1 s-1的条件下,依次沿0°、45°和90°的轧制方向,对7075铝合金板材进行热拉伸试验,研究7075铝合金的高温力学性能。结果表明:7075铝合金的力学性能受变形温度、应变速率及轧制方向的影响,7075铝合金的抗拉强度随变形温度的升高而降低,随应变速率的增大而增加,且抗拉强度的增长率比较大;抗拉强度在轧制方向为0°时最高,45°时次之,90°时最低。通过对7075铝合金热拉伸获得的试验数据进行参数拟合,建立了在不同轧制方向上的Arrhenius型本构方程。
The hot tensile tests of 7075 aluminum alloy sheet were conducted with the rolling directions of 0°,45° and 90° under the deformation temperatures of 440,460 and 480 ℃ and the strain rates of 0. 001,0. 01 and 0. 1 s-1 to study the high temperature mechanical properties of 7075 aluminum alloy. The results show that the mechanical properties of 7075 aluminum alloy are affected by the deformation temperature,strain rate and rolling direction. The yield strength and tensile strength of 7075 aluminum alloy decrease with the increase of deformation temperature and increase with the increase of strain rate,and the growth rate of tensile strength is greater. When the rolling direction is 0°,the tensile strength is the highest,followed by 45°,and the least is 90°. The Arrhenius constitutive equations of 7075 aluminum alloy in different rolling directions were established by fitting the experimental data obtained from the hot tensile tests of 7075 aluminum alloy.
作者
倪炀
蔡玉俊
董晓传
袁斌先
李国和
NI Yang;CAI Yu-jun;DONG Xiao-chuan;YUAN Bin-xian;LI Guo-he(National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mould,Tianjin University of Technology&Education,Tianjin 300222,China;Beijing National Innovation Institute of Lightweight Ltd.,China Academy of Machinery Science and Technology Group Co.,Ltd.,Beijing 100044,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第2期128-134,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51875409)
天津市智能制造专项
天津市教委科研计划项目(2017KJ101)。
关键词
7075铝合金
高温变形
本构方程
应变速率
轧制方向
7075 aluminum alloy
high temperature deformation
constitutive equation
strain rate
rolling direction
