Zhengping Su, Yu Duan, Yusong Tian, Shukuan Guo, Penghui Li, Lin Wang, Yeqiang Bu, Anmin Nie, Hongtao Wang, Yongjun Tian, Wei Yang
The structure of dislocation cores, the fundamental knowledge on crystal plasticity, remains largely unexplored in covalent crystals. Here, we conducted atomically resolved characterizations of dislocation core structures in a plastically deformed diamond anvil cell tip that was unloaded from an exceptionally high pressure of 360 GPa. Our observations unveiled a series of nonequilibrium dislocation cores that deviate from the commonly accepted "five-seven-membered ring" dislocation core model found in FCC-structured covalent crystals...
April 2, 2024: Proceedings of the National Academy of Sciences of the United States of America