H62铜合金和T2纯铜不同塑性变形的微结构演变（英文）  

Microstructure Evolution of H62 Copper Alloy and T2 Pure Copper in Different Plastic Deformation under Tensile Loading

作　　者：李磊[1] 史志铭[1] 张丽[1] 

机构地区：[1]内蒙古工业大学,内蒙古呼和浩特010051

出　　处：《稀有金属材料与工程》2017年第12期3589-3594,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(11002065)

摘　　要：对相同退火温度和相同尺寸的T2纯铜板和H62铜合金进行单向拉伸试验,分析2种材料在不同应变状态下对损伤度的影响。结果表明,T2纯铜和H62铜合金的断裂及损伤与其在拉伸作用下的微观组织演变密切相关,微组织的演变对认识2种材料的断裂机理非常重要。2种材料的形状因子随着应变增大具有相似的变化趋势,但不同的是H62铜合金形状因子较大。2种材料相对形状因子的变化非常相似,形状因子的相对增长趋势完全一致。在本研究中,晶粒的形状因子损伤变量被用来定量描述材料的微结构特征,通过对2种材料的显微分析和力学试验,建立了材料随塑性变形的演变规律。通过指数函数对2种材料的归一化形状因子曲线进行了拟合,建立了拟合方程,揭示材料宏观变形与微结构之间的关系。Uniaxial tensile tests were carried out on T2 pure copper plate and H62 copper alloy subjected to identical heat treatment.The influences of different strain states on the damage degree of both materials were analyzed.It is found that the fracture and damage of T2 pure copper and H62 copper alloy are closely related to their microstructure under tensile loading.The shape factor of the studied materials shows a similar variation trend with increasing strain,while shape factor for H62 copper alloy is larger than that for T2 pure copper.Evolution of relative shape factor for the studied materials shows very similar variation.In the present work,a damage variable of shape factor of grains was put forward to quantitatively describe the character of microstructure;its evolution with the plastic deformation was built-up by micro-analytical and mechanical experiments for T2 pure copper plate and H62 copper alloy.By virtue of exponential function,the normalized shape factor curves of the studied materials were fitted and the fitting equations were established,which reveals the relationship between the macroscopic deformation and microstructure of materials.

关 键 词：损伤演变 微结构 塑性变形 单轴拉伸 T2纯铜和H62铜合金 

分 类 号：TG146.11[一般工业技术—材料科学与工程]