Dislocation Evolution in Cyclic‐Loaded Cu Nanopillars with Different Configurations
Source abstract
Abstract
Abstract Small‐sized metals generally exhibit unusual deformation responses subjected to cyclic loading, since their limited volume cannot effectively accommodate micro‐sized dislocation patterns typically found in their bulk counterparts. Here, the cyclic behaviors in Cu nanopillars with different configurations are investigated using in situ transmission electron microscopy fatigue test. Dislocation tangles formed in single‐ and twinned‐crystal nanopillars as a result of cycling‐induced operations of multiple slip systems and further unpinning and absorption of pinned dislocations. While, nanopillars configured with low‐angle grain boundary (LAGB) underwent the degradation and eventual decomposition of the LAGB due to the cycling‐induced emission of grain boundary dislocations, which resulted in high‐density mobile dislocations to withstand the cyclic loading. These findings contribute to a systematic and comprehensive understanding of the micro‐mechanics of dislocation‐related phenomena in the cyclic response of nanoscale metals.
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Research context
OpenAlex topics: Microstructure and mechanical properties · Aluminum Alloys Composites Properties · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center of Electron Microscopy State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China
Material Research Institute Henan Academy of Sciences Zhengzhou 450002 China
Longmen Laboratory of Luoyang Luoyang 471000 China
Zhejiang Academy of Special Equipment Science Hangzhou 310020 China
Center for X‐mechanics Department of Engineering Mechanics Zhejiang University Hangzhou 310027 China
Suzhou Laboratory Suzhou 215134 China
School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney Sydney NSW 2006 Australia
Institute of Materials Research and Engineering (IMRE) Agency for Science, Technology and Research (A*STAR) Singapore 138634 Singapore
Funding
National Basic Research Program of China · National Natural Science Foundation of China
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