Dynamic Balance between Grain Refinement and Grain Growth During High-Pressure Torsion of Cu Powders
Abstract
High-pressure torsion (HPT) was applied to unmilled coarse-grained (CG) Cu powders with low initial dislocation density and cryomilled nanocrystalline (nc) Cu powders with high initial dislocation density, with identical processing parameters. HPT of unmilled CG Cu powders resulted in exceptional grain refinement and increase in dislocation density, whereas significant grain growth and decrease in dislocation density occurred during HPT of cryomilled nc Cu powders. Equilibrium structures were achieved under both conditions, with very similar stable grain sizes and dislocation densities, suggesting dynamic balances between deformation-induced grain refinement and grain growth, and between deformation-induced dislocation accumulation and dislocation annihilation. The equilibrium structures are governed by these two dynamic balances.
Recommended Citation
H. Wen et al., "Dynamic Balance between Grain Refinement and Grain Growth During High-Pressure Torsion of Cu Powders," Philosophical Magazine Letters, vol. 93, no. 8, pp. 481 - 489, Taylor & Francis, Aug 2013.
The definitive version is available at https://doi.org/10.1080/09500839.2013.805268
Department(s)
Materials Science and Engineering
International Standard Serial Number (ISSN)
0950-0839
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2013 Taylor & Francis, All rights reserved.
Publication Date
01 Aug 2013
