摘要
进行了1Cr18Ni9Ti(奥氏体321型不锈钢)的TEM原位拉伸实验,观察到了位错从裂纹尖端的发射、无位错区形成、纳米裂纹形核及位错塞积等物理现象。其中无位错区形状清楚,和理论计算结果吻合,无位错区中的纳米裂纹形核与长大验证了微孔聚合的裂纹扩展机理。
In-situ TEM observation was carried out on an austenitic stainless steel. Dislocation emission from the crack tip, formation of dislocation-free zones, nucleation of nano-cracks and dislocation pile-ups were all observed. The shape of the dislocation-free zone was clear and consistent with results of theoretical calculations. Nucleation and growth of nano-cracks in the dislocation-free zone verified that the crack growth mechanism involves micro-crack coalescence.
出处
《北京化工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第4期34-36,共3页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家自然科学基金(10272020)
关键词
TEM原位观察
位错发射
无位错区
in-situ TEM
dislocation emission
dislocation-free zone
