Journal
SCIENCE CHINA-MATERIALS
Volume 65, Issue 3, Pages 820-826Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-021-1776-y
Keywords
twin-structured; detwinning; in situ; transmission electron microscopy; atomic scale
Categories
Funding
- Beijing Natural Science Foundation [Z180014]
- Beijing Outstanding Young Scientists Projects [BJJWZYJH01201910005018]
- National Natural Science Foundation of China [51771104]
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The study found that there are three different types of detwinning mechanisms in nanocrystalline AuAg alloys, which are caused by grain boundary migration, combined layer-by-layer thinning and incoherent twin boundary migration, and collective motion of partial dislocations in an array.
Detwinning is an important plastic deformation mechanism that can significantly affect the mechanical properties of twin-structured metals. Although many detwinning mechanisms have been proposed for pure metals, it is unclear whether such a deformation model is valid for nanocrystalline alloys because of the lack of direct evidence. Here, the atomic-scale detwinning deformation process of a nanocrystalline AuAg alloy with an average grain size of similar to 15 nm was investigated in situ. The results show that there are three types of detwinning mechanisms in nanocrystalline AuAg alloys. The first type of detwinning results from grain boundary migration. The second type of detwinning occurs through combined layer-by-layer thinning and incoherent twin boundary migration. The last one occurs through incoherent twin boundary migration, which results from the collective motion of partial dislocations in an array.
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