Regular ArticleRadiation induced detwinning in nanotwinned Cu
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An atomistic study of the thermal and anti-thermal behavior of incoherent twin step migration under an elastic energy driving force
2022, Computational Materials ScienceCitation Excerpt :The ITB step mobilities thereby are much larger than that of general GBs, indicating that the migration of Σ3{112} ITB step is much easier than that of general GBs. Because the migration of Σ3{112} ITB step determines the twinning or detwinning processes of nanotwinned metals [13–18], which has a significant impact on the mechanical properties of these metals, particular attention must be paid to the migration of Σ3{112} ITB step when nanotwinned metals are developed. Finally, there is an intriguing and important question to be answered, namely, why are the ITB step migration behavior in the two metals so different?
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2021, MaterialiaCitation Excerpt :Such nanotwin structures provide not only barriers to dislocation glide [3,8,9] but also additional dislocation nucleation sites [10,11], thereby enhancing both strength and ductility. Despite these advantageous mechanical properties, nanotwins are thermodynamically unstable and can be readily eliminated by annealing [5,12], radiation [13–15], and shear deformation [16–19]. However, CTBs can hardly migrate unless disconnections are generated on the boundary plane [20], a process which requires a driving force as high as 1.3 GPa in copper [20].