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In situ atomic-scale observation of dislocation behaviors in twin-structured Pt nanocrystals

查看全文 作　　者：GUO [1]YiZhong;SUN [1]Tao;FU [1]LiBo;HAO [1]LongHu;HUANG [1]Ming;WEI [1]RuJian;LUO [2]JunFeng;HE [2]Xin;WANG [2]XingQuan;XIONG [2]XiaoDong;WANG [1]LiHua;HAN [1]XiaoDong 高影响力作者 机构地区：[1]Beijing Key Lab of Microstructure and Property of Advanced Materials,Institute of Microstructure and Properties of Advanced Materials,Beijing University of Technology,Beijing 100124,China;[2]Grikin Advanced Materials CO.,LTD.,Beijing 102200,China高影响力机构 出　　处：《Science China(Technological Sciences)》索引2021年第64卷第3期,共6页高影响力期刊 基　　金：the National Key R&D Program of China(Grant No.2017YFB0305501);the Beijing Outstanding Young Scientist Projects(Grant No.BJJWZYJH01201910005018);the National Natural Science Foundation of China(Grant Nos.11722429,51771104,91860202);“111”Project(Grant No.DB18015);the Beijing Natural Science Foundation(Grant No.Z180014);the Fok Ying-Tong Education Foundation of China(Grant No.151006)。 摘　　要：The deformation mechanisms of twin-structured metallic materials have attracted great interest.Though previous theoretical predictions have suggested that the repulsive force of the twin boundary(TB)can significantly affect the deformation of twinstructured metals,it remains unclear whether this prediction applies to experimental conditions.In this paper,the atomic-scaled deformation process of twin-structured Pt nanocrystals was in situ observed using our home-made device in a high-resolution transmission electron microscope.We have shown that the plastic deformation of the twin-structured Pt nanocrystals was governed by full dislocation generation as well as Lomer dislocation(LD)lock formation and destruction.After LD locks were destructed,these full dislocations tended to move towards the surface of the nanocrystals.The findings revealed that due to the ultra-high repulsive force of TB on dislocation,there was no dislocation-TB reaction during the deformation.These findings can enrich our understanding of the dislocation behaviors of twin-structured nanocrystals. 关 键 词：deformation mechanism repulsive force twin boundary dislocations in situ
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