Abstract
In-situ (Ti,Nb)B whiskers ((Ti,Nb)Bw) reinforced Ti-based high-entropy alloy (HEA) matrix composites ((Ti,Nb)Bw/Ti1.5ZrNbAl0.3) with a quasi-continuous network microstructure were successfully fabricated via low energy milling (LEM) and hot-pressed sintering (HPS). The results show that the in-situ (Ti,Nb)Bw reinforcements were distributed around Ti1.5ZrNbAl0.3 matrix particle forming a special network architecture. This microstructure resulted in remarkable grain refinement of Ti-based HEA matrix, which contributed to the superior strength-ductility synergy. Consequently, the as-sintered (Ti,Nb)Bw/Ti1.5ZrNbAl0.3 composites exhibited a high yield strength (σYS = 1015 MPa) while maintaining superior ductility (ϵe = 17.5%), which were simultaneously increased by 11.5% and 96.6% compared with the monolithic Ti1.5ZrNbAl0.3 alloy. The network microstructure design of HEA-based composites could be therefore exploited to overcome the strength-ductility trade-off.
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