Journal
SCRIPTA MATERIALIA
Volume 162, Issue -, Pages 316-320Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.11.038
Keywords
Dislocation density; Composite; Strain-hardening; Plastic deformation; Microstructure
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Funding
- National Key R&D Program of China [2017YFA0204403]
- National Natural Science Foundation of China [51601094, 51501092, 51731007]
- Australian Research Council [DP150101121]
- U.S. Army Research Office [W911 NF-17-1-0350]
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During the plastic deformation of a metal matrix composite (MMC) containing non-deformable particles, high dislocation density and strong back stresses are expected because the particles help with blocking and accumulating dislocations. Here we report that the MMC has lower, instead of higher, dislocation density than the corresponding monolithic matrix material when they are deformed to high plastic strains, because smaller sub-grains in the MMC lowered dislocation generation rate and meanwhile promoted the dislocation interaction and annihilation in the matrix. This unique defect density evolution is a hitherto unknown but important factor affecting the mechanical properties of MMCs. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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