7A85铝合金板材的拉伸应变特征及本构方程  

Tensile Strain Characteristic and Constitutive Equation of 7A85 Aluminum Alloy Sheet

作　　者：袁航 刘艳丽[1] 陆政 樊振中 高文理[1] YUAN Hang;LIU Yanli;LU Zheng;FAN Zhenzhong;GAO Wenli(College of Materials Science and Engineering,Hunan University,Changsha 410082,China;China ACCE Beijing Institute of Aeronautical Materoals,Beijing 100095,China)

机构地区：[1]湖南大学材料学院,湖南长沙410082 [2]中国航发北京航空材料研究院,北京100095

出　　处：《热加工工艺》2023年第20期33-37,共5页Hot Working Technology

基　　金：工信部军品配套项目(2019)。

摘　　要：通过对退火态7A85铝合金挤压板材进行横向热拉伸实验,研究了在不同拉伸温度(200、300、400℃)和不同应变速率(0.001、0.005、0.01 ·s^(-1))下的拉伸应变特征。结果表明,退火态7A85铝合金板材在热拉伸过程中存在着加工硬化和动态回复过程。当应变速率相同时,7A85铝合金板材的抗拉强度随着变形温度的升高而降低,同时当变形温度相同时,板材的抗拉强度随应变速率的增加而增大。通过对热拉伸数据进行线性参数拟合,建立了满足温度和流变应力之间的Arrhenius型本构方程。The tensile strain characteristics of annealed 7A85 aluminum alloy sheet under different tensile temperatures(200,300,400℃)and different strain rates(0.001,0.005,0.01 ·s^(-1))were studied by hot tensile test.The results show that there are work hardening and dynamic recovery processes in the hot tensile process of annealed 7A85 aluminum alloy sheet.When the strain rate is the same,the tensile strength of 7A85 aluminum alloy sheet decreases with the increase of deformation temperature.At the same time,when the deformation temperature is the same,the tensile strength of 7A85 aluminum alloy sheet increases with the increase of strain rate.The Arrhenius type constitutive equation satisfying the relationship between temperature and flow stress is established by fitting the hot tensile data with linear parameters.

关 键 词：7A85铝合金 拉伸实验 流变应力 本构方程 

分 类 号：TG146.21[一般工业技术—材料科学与工程]