Phase equilibria and liquid phase separation phenomenon in Cu-Ni-Nb system

摘要：

Liquid phase separation phenomenon has been paid widespread attention on developing in-situ amorphous matrix composites.In this study, firstly, we determined the isothermal section of the phase diagrams at 1273, 1373 and 1473 K in the Cu-Ni-Nb ternary system.Thermodynamic assessment of the Cu-Ni-Nb system was also carried out based on experimental data of activity and phase equilibria using the CALPHAD (Calculation of Phase Diagrams) method.The calculated result of vertical section shows a stable liquid miscibility gap (L1+L2) (Fig.1).Secondly, based on this liquid miscibility gap, a new crystalline/amorphous composite with a droplet-type microstructure is fabricated in Cu-Ni-Nb immiscible system by using melt-spinning method.It is found that the Cux(Ni38Nb62)100-x (x=0,10, 20, 30 at.％) alloys undergo liquid-liquid phase separation in the undercooled liquid state,and then solidified into Cu-rich crystalline phase and NiNb-based amorphous phase (see Fig.2).The fcc Cu-fich crystalline droplets are dispersed in the NiN-b-based amorphous matrix.

作者: J.H.Zhu W.W.Xu S.Y.Yang Y.Yu C.P.Wang X.J.Liu

作者单位: Department of Materials Science and Engineering, College of Materials, Xiamen University,Xiamen 3610 Department of Materials Science and Engineering, College of Materials, Xiamen University,Xiamen 3610

会议类型: 国内会议

会议名称: 第十七届全国相图学术会议暨相图与材料设计国际研讨会

会议地点: 桂林

会议语种:英文

页码: 231-231

在线出版日期: 2015-11-03（万方平台首次上网日期，不代表论文的发表时间）