循环形变下纯钛中两种γ氢化物的不同变形行为  

THE DIFFERENT DEFORMATION BEHAVIORS OF THE TWO TYPES OF 7 HYDRIDES IN PURE TITANIUM UNDER CYCLIC STRAINING

作　　者：陈常强[1] 李守新[1] 卢柯[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家实验室,110016

出　　处：《金属学报》2003年第2期120-125,共6页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划G19990650;国家自然科学基金资助项目59931020

摘　　要：在含氢量(质量分数)为0.0077％的工业纯钛中,观察了两种具有同样结构的γ氢化物的变形行为,利用扫描电镜(SEM)和透射电镜(TEM)对循环载荷下滑移、孪生对两种γ氢化物的相互作用进行了观察.发现在循环形变下Ⅰ型氢化物能够通过滑移机制发生塑性变形,甚至完全碎化,而不会形成孔洞,而Ⅱ型氢化物则难以发生塑性变形.Two types of 7 hydride precipitates with the same structure were observed in coarse grained commercially pure titanium containing about 77×10-6 hydrogen. The interactions of slipping and twinning with both types of hydrides under cyclic straining were analyzed using SEM and TEM. It was found that the type-Ⅰγ hydrides can be plastically deformed and even ultimately fragmented by a slip mechanism with no voids formed under cyclic plastic deformation. While type-Ⅱγ 7 hydrides are difficult to be plastically deformed. The crystallographic mechanisms for the plastic deformation of hydrides were discussed.

关 键 词：纯钛 氢化物 循环形变 滑移 孪生 

分 类 号：TG146.23[一般工业技术—材料科学与工程]