材料科学
纳米孔
脆化
原子单位
脆性
纳米孔
位错
透射电子显微镜
延展性(地球科学)
可塑性
复合材料
纳米尺度
冶金
纳米技术
物理
蠕动
量子力学
作者
Mingwei Chen,Xiao Wei,Shuangxi Song,Li Hua Wang,Akihiko Hirata,Takeshi Fujita,Xiao Han,Ze Zhang,Mingwei Chen
标识
DOI:10.1016/j.actamat.2018.11.022
摘要
It has been known for decades that nanopores produced by selective leaching during galvanic corrosion can lead to dramatic loss of materials ductility and strength under tension. However, the underlying atomic mechanisms of the nanopore induced embrittlement remain to be poorly known. Here we report in situ observations of the deformation and failure of dealloyed nanoporous gold by utilizing the state-of-the art aberration-corrected transmission electron microscopy and fast direct electron detection camera. Our time-resolved atomic observations reveal that the brittle failure of the nanoporous gold originates from plastic instability of individual gold ligaments by the interplay between dislocation plasticity and stress-driving surface diffusion.
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