Heterostructured Titanium Composites with Superior Strength-Ductility Synergy Via Controllable Bimodal Grains and <c Plus A> Dislocation Activity
Materials research letters(2023)
Abstract
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 dislocations in CGs and accumulation near the CG/UFG boundaries. Moreover, hybrid reinforcements also activate multiple hardening mechanisms, inducing high ductility.
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Key words
Metal matrix composites,heterostructures,strength-ductility,dislocation
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