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In Situ Observation of Twin Boundary Sliding in Single Crystalline Cu Nanowires
Author(s) -
Yue Yonghai,
Zhang Qi,
Zhang Xuejiao,
Yang Zhenyu,
Yin Penggang,
Guo Lin
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201604296
Subject(s) - materials science , crystal twinning , necking , nanowire , in situ , dislocation , substructure , transmission electron microscopy , atomic units , tilt (camera) , composite material , crystallography , deformation (meteorology) , nanotechnology , geometry , microstructure , structural engineering , chemistry , physics , organic chemistry , mathematics , quantum mechanics , engineering
Using a homemade, novel, in situ transmission electron microscopy (TEM) double tilt tensile device, plastic behavior of single crystalline Cu nanowires of around 150 nm are studied. Deformation twins occur during the tests as predesigned before the experiments. In situ observation of twin boundary sliding (TBS) caused by full dislocation (extended dislocation) is first revealed at the atomic scale which is confirmed by molecular dynamics (MD) simulation results. Combined with twin boundary migration and multiple dislocations nucleated from surface, TBS causes a superlarge fracture strain which is over 166% and a severe necking which is over 93%, far beyond the typical values for most nanomaterials without twins.