Abstract
We have innovatively achieved bimorphic-bimodal microstructures (BBMs) by semi-solid sintering of TiNbNiCu(Al/Sn) amorphous alloy powders. The BBM contains equiaxed ultrafine-grain matrix, which inherits crystallized equiaxed microstructure after solid sintering, of fcc MTi2 (M = Cu, Ni) embeded into bcc β-Ti, accompanied by isolated regions with coarse β-Ti surrounded by ultrafine-grain fcc MTi2 shell, which originate from fast growth of crystallized β-Ti formed during solid sintering and rapid cooling of fcc MTi2 melt during semi-solid sintering. Resultantly, the BBMs exhibit high an ultimate compressive strength of 2567 MPa and a large plastic strain of 38.1%, superior to those of similar titanium alloys fabricated by melt solidification. The excellent mechanical properties are attributed to the multiplication of slip bands, which are formed in bcc β-Ti phase regions and intercepted by fcc MTi2 phases in the BBM titanium alloys. We anticipate that our work could provide a new strategy for designing lightweight and high-performance materials.
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