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Small. 2017 Jul;13(25). doi: 10.1002/smll.201604296. Epub 2017 May 16.

In Situ Observation of Twin Boundary Sliding in Single Crystalline Cu Nanowires.

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Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry, Beihang University, Beijing, 100191, P. R. China.
Institute of Solid Mechanics, Beihang University, Beijing, 100191, P. R. China.


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.


in situ; single crystalline Cu nanowires; twin boundary sliding


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