Abstract
We present a fundamentally different approach to process the bimodal Ti-based alloy (Ti-Nb-Fe-Co-Al) by semi-solid sintering stemmed from hypoeutectic reaction, aiming at achieving ultrafine eutectic structure, β-Ti and micron-sized dispersed phase with strengthening effect. As expected, the microstructure of the processed Ti-Nb-Fe-Co-Al alloy contains local ultrafine eutectic structure (β-Ti and TiFe), residual equiaxed β-Ti and micron-sized dispersed phase Ti2Co. This alloy possesses excellent properties, the yield strength is 1620MPa and large plastic strain is 20%, superior to those of the previous fully eutectic alloy by casting. The novel idea is helpful to fabricate high-performance alloys and metals, which belonging to high temperature alloy systems.
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