多晶金属屈服的非线性不可逆增殖模型  

A YIELD MODEL OF POLYCRYSTALLINE METAL BASED ON NONLINEAR IRREVERSIBLE MULTIPLICATION PROCESS

作　　者：何宗彦[1] 黄克智[1] 

机构地区：[1]清华大学

出　　处：《金属学报》1995年第3期A097-A104,共8页Acta Metallurgica Sinica

基　　金：国家自然科学基金

摘　　要：基于塑性形变晶粒在拉伸过程中不可逆增殖的假定，提出多晶金属的一种屈服模型，导出较为简洁的应力和形变时间关系式．当形变时间较短时还可推出近似的屈服应力表达式．根据初始形变晶粒比、拉伸速度、晶粒直径等参数的不同取值可描述多晶金属的各种典型屈服，定量地解释若干屈服现象，与Ｈａｌｌ－Ｐｅｔｃｈ公式和文献［１，２］的实验结果吻合较好．On the assumption that plastically deformed grains multiply irreversibly during tensile deformation, a yield model of polycrystalline metal and explicit relationships between stress σ and deformation time t were proposed. When t is small enough, the yield stresses can be formulated approximately. According to the different values of the ratio of initially deformed grains, tension rate, grain diameter and other parameters. several typical yield modes can be described. some phenomena can be explained quantitatively, which are in better agreement with Hall-Petch formula and the experiments.

关 键 词：多晶体 屈服 位错 金属学 非线性 增殖模型 

分 类 号：TG111.7[金属学及工艺—物理冶金]