期刊
MATERIALS RESEARCH LETTERS
卷 11, 期 10, 页码 863-871出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2023.2252858
关键词
Metal matrix composites; heterostructures; strength-ductility; dislocation
A novel and controllable strategy of simple powder assembly is proposed to fabricate heterostructured metal matrix composites, which breaks the strength-ductility trade-off dilemma and enhances < c+a > dislocation activity.
Constructing heterostructures in particulate reinforced titanium matrix composites (PRTMCs) to evade the strength-ductility trade-off dilemma is much more difficult than in metals. Here, we proposed a novel and controllable strategy of simple powder assembly to fabricate bimodal-grained PRTMCs, this customized strategy makes coarse grains (CGs) surrounded by ultrafine-grained (UFG) matrices, conferring a superior strength-ductility combination not achievable by their traditional homogeneous counterparts. We found that such heterostructures appear to promote storage of mostly < c+a > dislocations in CGs and accumulation near the CG/UFG boundaries. Moreover, hybrid reinforcements also activate multiple hardening mechanisms, inducing high ductility. STATEMENT We proposed a novel and controllable strategy of simple powder assembly to fabricate heterostructured metal matrix composites for breaking the strength-ductility trade-off dilemma and revealed the enhanced < c+a > dislocation activity.
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