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

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Yonghai YueLin Guo

Abstract

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.

References

Aug 18, 2004·Science·Michael D UchicWilliam D Nix
Oct 13, 2005·Nano Letters·Wuwei LiangFujiu Ke
Jan 22, 2010·Nature·Qian YuEvan Ma
Jan 27, 2011·Nature Communications·He ZhengScott X Mao
Jul 16, 2011·Nano Letters·Jong-Hyun SeoJae-Pyoung Ahn
Apr 25, 2013·Nature Communications·Jiangwei WangScott X Mao
Aug 1, 2013·Nano Letters·Yonghai YueXiaodong Han

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