多晶Au纳米线大塑性变形的原位TEM研究
蒙 月1,王立华1,张 泽1,2,韩晓东1
(1.北京工业大学固体微结构与性能研究所,北京 100124;2.浙江大学电镜中心,材料科学与工程学系,浙江 杭州 310027)
摘 要:本文利用透射电镜‘双倾拉伸实验’技术,原位研究了Au多晶纳米线在拉伸状态下的变形行为。实验发现由纳米晶粒组成的多晶纳米线在室温下具有~48%的大塑性变形能力。这种大塑性变形能力由晶界滑移和晶界的迁移相互协调实现。在滑移的同时,通过晶界原子扩散导致的晶界迁移来协调晶界滑移,避免空洞和裂纹的产生。
关键词: 多晶纳米线;TEM原位拉伸;晶界扩散;晶界滑移;晶界迁移;大塑性变形
中图分类号:TB383;TG115.21+5.3;TG111;TG115.5 文献标识码:A doi:10.3969/j.1000-6281.2014.04.000
In situ TEM studies of the large plastic deformation of nanocrystalline gold nanowire
MENG Yue1,WANG Li-hua1,ZHANG Ze1,2, HAN Xiao-dong1
(1.Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124;2.Department of Materials Science and Engineering, Zhejiang University, Hangzhou Zhejiang 310027, China)
Abstract:In this paper, the deformation behaviors of nanocrystalline gold nanowire werein-situ observed with homemade TEM double tilt tensile device. The nanocrystalline nanowires exhibit approximate 48% of homogeneous elongation ability. Thein-situ TEM observation indicates that the ultra-large plastic deformation is realized through the coordination of grain boundary sliding and grain boundary migration. During the deformation process, the grain boundary sliding provides the large plastic deformation ability, which is at the mean time accommodates by the grain boundary migration.
Keywords:nanocrystalline nanowire; in situ TEM tensile; grain boundary diffusion; grain boundary sliding; grain boundary migration; large plastic deformation
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