Ti-Ni-Nb三元系相图800℃等温截面的实验测定

Experimental Investigation on the 800 ℃ Isothermal Section of the Ti-Ni-Nb Ternary System

应用多元扩散偶—电子探针微区成分分析技术，研究了Ｔｉ－Ｎｉ－Ｎｂ三元系相图８００℃下的相平衡关系，确定了该三元系相图８００℃等温截面的１２个单相区、２２个两相区和９个三相区。首次给出了Ｔｉ－Ｎｉ－Ｎｂ三元系相图的８００℃等温截面。此外，还确定了４种三元化合物（ＸＡ，ＸＢ，ＸＣ和ＸＤ）的存在，其中ＸＢ为作者首次发现，其化学计量式为Ｔｉ３Ｎｉ９Ｎｂ８。

The phase equilibria of the Ti-Ni-Nb ternary system at 800℃have been studied by means of the diffusion couple and electronic microprobe technique. The 12 single-phase regions, 22 two-phase regions and 9 three-phase regions in the 800℃ isothermal section were determined. The 800 ℃ isothermal section of the system is firstly presented. Moreover, XA, XB, XC and XD ternary compounds and their composition range are determined, in which XB  compound has been discovered for the first time. The stoichiometrical formula of XB compound is Ti3Ni9Nb8.