摘要
Phase equilibria in Ti?Ni?Pt ternary system have been experimentally determined through diffusion triple technique combined with alloy samples approach.Assisted with electron probe microanalysis(EPMA)and X-ray diffraction(XRD)techniques,isothermal sections at 1073 and 1173 K of this system were constructed and existence of ternary phase Ti2(Ni,Pt)3 was confirmed.In addition,binary compounds Ti3Pt5 and TiPt3-were found to be stable at 1073 and 1173 K,and remarkable ternary solubility in some binary compounds was detected,e.g.,solubility of Pt in TiNi can be up to about 36%(molar fraction)at 1073 K and 40%(molar fraction)at 1173 K.Furthermore,a ternary invariant transition reaction TiNi3+Ti3Pt5→Ti2(Ni,Pt)3+TiPt3+at a temperature between 1073 and 1173 K was deduced.
采用扩散偶辅以平衡合金法的方法,利用电子探针(EPMA)和X射线衍射(XRD)等分析手段对Ti-Ni-Pt三元系的1073和1173 K等温截面的相关系进行实验测定。结果表明,三元化合物Ti_2(Ni,Pt)_3和二元化合物Ti_3Pt_5、TiPt_(3-)在1073和1173 K是稳定的。部分二元化合物具有较大的第三组元固溶度,如在1073和1173 K下,Pt在TiNi中的固溶度分别约为36%和40%(摩尔分数)。此外,在1073~1173 K的温度区间内存在零变量反应TiNi_(3+)Ti_3Pt_5→Ti_2(Ni,Pt)_(3+)TiPt_(3+)。
基金
Project(2016YFB0701404)supported by the National Key Research and Development Program of China
Project(51171210)supported by the National Natural Science Foundation of China
