Nano-phase formation accompanying phase separation in undercooled CoCrCuFeNi-3 at.% Sn high entropy alloy

作者：Wang, S.; Chen, Z.^*; Feng, L. C.; Liu, Y. Y.; Zhang, P.^*; He, Y. Z.; Meng, Q. Q.; Zhang, J. Y.

来源：Materials Characterization, 2018, 144: 516-521.

DOI：10.1016/j.matchar.2018.08.008

• Undercooled solidification
• High-entropy alloy
• Liquid-phase separation
• Nano-precipitation

Highly undercooled multi-component CoCrCuFeNi-3 at.% Sn high-entropy alloy was studied by adopting molten glass purification combined with cycle superheating methods. Based on the critical undercooling Delta T*, the characteristic of liquid-phase separation was researched at different undercoolings. Accompanying phase separation, two phases (CoCrFeNi-rich and CuNi-rich) and three kinds of nano-precipitates (CrCo-rich, CrSn-rich and Sn-rich nano-precipitates) were detected. The microhardness of undercooled CoCrCuFeNi-3 at.% Sn high entropy alloys increased markedly with the increase of undercooling. The effect of Sn on the microstructure evolution and properties in the process of phase separation was clarified with the aid of nano-precipitates.

• 出版日期2018-10
• 单位中国矿业大学（北京）