Isothermal section at 927 ℃ of Cr-Ni-Ti system

来源期刊：中国有色金属学报(英文版)2007年第4期

论文作者：谭永恒 徐洪辉 杜勇

文章页码：711 - 711

Key words：Cr-Ni-Ti ternary system; phase diagram; diffusion; EPMA

Abstract: The isothermal section at 927 ℃ of the Cr-Ni-Ti system was established using a high-efficiency diffusion couple approach, supplemented with eight equilibrated alloys. The alloy compositions were selected on the basis of the experimental results from the diffusion couple. Both the diffusion couple specimens and the alloys were examined by means of optical microscopy, scanning electron microscopy, and electron probe microanalysis. No ternary compound is found at 927 ℃. The following five three-phase equilibria are well determined: TiNi₃+(Cr)+(Ni), TiNi₃+(Cr)+TiNi, TiNi+(Cr)+Cr₂Ti, Ti₂Ni+Cr₂Ti+TiNi and Ti₂Ni+Cr₂Ti+(Ti). The solubilities of Cr in NiTi₂, NiTi, and Ni₃Ti are determined to be 7.5%, 14.5% and 11.4% (molar percent), respectively. α-Cr₂Ti and β-Cr₂Ti dissolve about 9.2% and 13.9% Ni (molar percent), respectively.

基金信息：the National Science Fund for Distinguished Young Scholars of China
the National Natural Science Foundation of China