期刊
SCIENCE
卷 375, 期 6586, 页码 1261-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abm2612
关键词
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资金
- Beijing Outstanding Young Scientists Projects [BJJWZYJH01201910005018]
- Basic Science Center Program for Multiphase Evolution in Hypergravity of the National Natural Science Foundation of China [51988101]
- Beijing Natural Science Foundation [Z180014]
- Natural Science Foundation of China [51988101, 51771004, 91860202]
Grain boundaries (GBs) are crucial for the mechanical behavior of polycrystalline materials, yet the atomic-scale dynamic processes of GB deformation remain unclear. This study presents an in situ atomic-resolution investigation on how sliding-dominant deformation occurs at general tilt GBs in platinum bicrystals, involving direct atomic-scale sliding and sliding with atom transfer across the boundary plane.
Grain boundaries (GBs) play an important role in the mechanical behavior of polycrystalline materials. Despite decades of investigation, the atomic-scale dynamic processes of GB deformation remain elusive, particularly for the GBs in polycrystals, which are commonly of the asymmetric and general type. We conducted an in situ atomic-resolution study to reveal how sliding-dominant deformation is accomplished at general tilt GBs in platinum bicrystals. We observed either direct atomic-scale sliding along the GB or sliding with atom transfer across the boundary plane. The latter sliding process was mediated by movements of disconnections that enabled the transport of GB atoms, leading to a previously unrecognized mode of coupled GB sliding and atomic plane transfer. These results enable an atomic-scale understanding of how general GBs slide in polycrystalline materials.
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