铸造2026，Vol.75Issue(8)：841-848,8.DOI:10.27014/j.cnki.zhuzao.2026.0108
Al/Ti/Ta合金化对CoCrNi中熵合金结构与性能的影响
Effects of Al/Ti/Ta Alloying on the Microstructure and Properties of CoCrNi Medium-Entropy Alloys
摘要
Abstract
Through introducing three kinds of Al/Ti/Ta elements into the CoCrNi medium-entropy alloy,and combining with vacuum arc melting,a series of(CoCrNi)99.5-2x(AlTi)xTa0.5 medium-entropy alloys(MEAs)have been fabricated to investigate the effects of codoping with Al(atomic fraction,at.%)(1,3,5,7),Ti(atomic fraction,at.%)(1,3,5,7),and Ta(0.5at.%)on microstructural evolution and mechanical properties of the CoCrNi medium-entropy alloys.The results indicate that the inducing of Al/Ti/Ta can prompt brittle precipitate phases to generate within the ductile CoCrNi matrix.The precipitation of secondary hard phases can significantly enhance the room-temperature compressive strength and hardness without significantly decreasing the fracture strain of the CoCrNi medium-entropy alloy.Specifically,the(AlTi)7Ta0.5 alloy exhibits an excellent strength-ductility balance,achieving a compressive yield strength of approximate 1.0 GPa and a hardness of HV470,respectively,while maintaining a high fracture strain of 23.6%.Microstructural characterizations reveal that the precipitation strengthening and solid solution strengthening are primary causes of the increment in yield strength and hardness.关键词
中熵合金/析出相/微观组织/力学性能/共合金化/析出强化/抗压屈服强度/强塑性平衡Key words
medium-entropy alloy/precipitated phase/microstructure/mechanical property/co-alloying/precipitation strengthening/compressive yield strength/strength-ductility balance分类
矿业与冶金引用本文复制引用
龚祖荣,李栋,张锐,李傲,王晓红,苏云婷,梁骁,马腾飞..Al/Ti/Ta合金化对CoCrNi中熵合金结构与性能的影响[J].铸造,2026,75(8):841-848,8.基金项目
中央引导地方科技发展资金项目—全省空气动力装备智能制造重点实验室建设(No.2025ZY01027). （No.2025ZY01027）
