Co-Ni-W三元系相图的实验测定与热力学计算

Experimental Investigation and Thermodynamic Assessment of the Co-Ni-W Ternary System

本研究采用合金法、电子探针显微分析仪(EPMA)和X射线衍射(XRD)技术,对Co-Ni-W三元系在1 000℃和1 200℃下的等温截面相图进行了实验测定。结合本研究和已报道的相平衡实验信息,基于CALPHAD(Calculation of phase diagrams)方法,对Co-Ni-W三元系相图进行了热力学优化与计算,获得了自洽性良好的热力学参数,计算结果与实验数据取得了良好的一致性。

The phase relations of the Co-Ni-W ternary system have been experimentally established for the isothermal section at 1 000℃,1 200℃.The investigation was based on metallography,X-ray powder diffraction,SEM and EMPA-techniques.Based on the experimental results from this work and literatures,the Co-Ni-W ternary system was thermodynamically assessed by using CALPHAD(Computer coupling of phase diagrams)method.The calculated results agree well the experimental data.