In-situ TEM Observation of Brittle Microcrack Nucleation  

作　　者：张跃 王燕斌 褚武扬 肖纪美 

机构地区：[1]Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, PRC

出　　处：《Chinese Science Bulletin》1994年第12期980-982,共3页

基　　金：Project supported by the National Natural Science Foundation of China.

摘　　要：Rice and Thomson assumed that no dislocation emission takes place from thecrack tip during brittle crack propagation. Experimental observations for Si andFe-Si have shown that dislocations are emitted during cleavage crack propagation.Argon suggested that the transformation from brittle fracture to ductile fracture insilicon is controlled by the number of dislocations emitted from the crack tip ratherthan by dislocation nucleation from the tip. However, Chiao assumed that

关 键 词：titanium aluminide nano-microcrack dislocation-free zone. 

分 类 号：O346[理学—固体力学]