Nb-Ti-Co三元系1173K等温截面的研究

Determination of Isothermal Sections of the Nb-Ti-Co Ternary System at 1173K

采用三元扩散偶技术测定了Nb-Ti-Co三元系富Co,Ti区域在1173K的等温截面,借助电子探针微区成分分析方法测定了Nb-Ti-Co三元扩散偶的相区成分,并对其相关系进行了研究。测得Nb-Ti-Co三元扩散偶富Co,Ti区域在1173K时存在6个二元中间化合物:NbCo3,NbCo2,TiCo3,TiCo2,TiCo和Ti2Co;Nb和Ti形成连续固溶体;在此温度的扩散偶中不形成三元中间化合物。经分析,Nb-Ti-Co三元系在1173K存在6个三相区:(Co)+TiCo3+NbCo3,NbCo3+TiCo3+NbCo2,NbCo2+TiCo3+TiCo2,TiCo2+NbCo2+TiCo,NbCo2+TiCo+Ti2Co和NbCo2+Ti2Co+(Nb,Ti)。

The isothermal section of Nb-Ti-Co ternary system rich in Co and Ti at 1173 K was determined by means of diffusion triple and electron microprobe analysis. The results indicate that there are six binary intermediate compounds formed： NbCo3, NbCo2, TiCo3, TiCo2, TiCo and Ti2Co. In this diffusion triple, Nb and Ti formed continuous solid solution, and no ternary compound was formed.There are six three-phase regions found at this temperature： （Co）＋TiCo3＋NbCo3, NbCo3＋TiCo3＋NbCo2, NbCo2＋TiCo3＋TiCo2, TiCo2＋NbCo2＋TiCo, NbCo2＋TiCo＋Ti2Co and NbCo2＋Ti2Co＋（Nb, Ti）. N