Abstract
To conquer the poor ductility of particulate-reinforced metal matrix composites, multiscale and dual-structured (M&D) reinforcing particulates, which consist of nano-/submicro-particulates with monolithic structure (<2 μm) and micro-particulates with core-shell structure (>2 μm), are synthesized in the model material of pure aluminum matrix composites. During plastic deformation, dislocations should be firstly emitted from nano-particulates at grain boundaries and then their motion is blocked by those in grain interior. Subsequently, submicro-particulates should start to act as dislocation sources to accommodate the increase in tensile stress. Finally, microscale spheroidal core-shell structured particulates further delay crack formation and propagation by fracturing successively from hard intermetallic shell to soft titanium core. As a result, the M&D reinforcing particulates exhibit a comparatively good toughening effect among pure aluminum matrix composites, achieving a high strength and enhanced ductility comparable to pure aluminum simultanously.
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