Ni_3（Al，Zr）单晶循环变形行为的研究  

CYCLIC DEFORMATION BEHAVIOUR OF Ni_3(Al,Zr) SINGLE CRYSTAL AT ROOM TEMPERATURE

作　　者：谷月峰[1] 刘毅[1] 林栋梁[1] 郭建亭[1] 

机构地区：[1]上海交通大学,中国科学院金属研究所

出　　处：《金属学报》1995年第11期A513-A518,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金;材料疲劳与断裂国家重点实验室资助

摘　　要：通过对Ｎｉ_３（Ａｌ，Ｚｒ）单晶在室温下对称拉－压循环变形实验，发现存在拉－压流变应力的不对称性和循环应变硬化现象。应力不对称性随所加循环应变的增大而增大。循环应力响应曲线可分为循环硬化及循环饱和两个阶段。透射电子显微镜（ＴＥＭ）观察表明：疲劳试样中的超结构位错主要以超结构内禀堆垛层错（ＳＩＳＦ）形式存在，这种位错结构是产生应变硬化的主要原因。Fully reversed strain-controlled tension-compression tests were performed at room temperature to study cyclic-deformation properties of Ni_3(Al,Zr) single crystal.Both cyclic strain hardening and a tension-compression flow stress asymmetry were recorded,the stress asymmetry becomes more prominent as the strain amplitude becomes larger;the cyclic hardening can divide into initiation and saturation stages.TEM observation showed that there are a profusion superlattic intrinsic stacking faults(SISFs) in fatigued Ni_3(Al,Zr) single crystal samples.The cyclic strain hardening is explained by the dislocation structure.

关 键 词：金属 循环变形 拉压应力 硬化 单晶 位错 

分 类 号：TG111.7[金属学及工艺—物理冶金]