同位相热机械疲劳形变后γ/γ’相界面上的位错网分析  

ANALYSIS OF DISLOCATION NETWORKS ON THE r/r' INTERFACES AFTER IN PHASE THERMO-MECHANICAL FATIGUE

作　　者：王跃臣[1] 李守新[1] 艾素华[1] 刘峰[1] 周丽[1] 张辉[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2003年第3期237-241,共5页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划资助项目G19990650

摘　　要：DD8单晶镍基高温合金经过同位相热机械疲劳(TMF)后,在垂直于应力轴的γ/γ’相界面上存在着大量的六角形位错网.对位错网中的位错进行的分析表明,六角形位错网中的位错都是刃型位错,而且这些位错的Brugers矢量都不与滑移过程开动的滑移系相对应.利用双交滑移模型说明了位错网的形成机制.A dense hexagonal dislocation network exists on the r/r' interfaces normal to the stress axis in DD8 single crystal nickel base superalloy after in phase (IP) thermo-mechanical fatigue(TMF). The dislocations in the dislocation networks were analysed, it is indicated that the dislocations in the hexagonal networks are edge and their Burgers vectors are not activated by glide processes. The formation mechanism of the dislocation network has been explained in detail by applying the double-cross-slip model.

关 键 词：单晶镍基高温合金 同位相 热机械疲劳 位错网 

分 类 号：TG111.8[金属学及工艺—物理冶金]