Calculation of activity coefficients for components in ternary Ti alloys and intermetallics as matrix of composites

来源期刊：中国有色金属学报(英文版)2004年第5期

论文作者：朱艳 杨延清 孙军

文章页码：875 - 879

Key words：activity coefficient; thermodynamics; Ti-alloy; intermetallics; interfacial reaction

Abstract: Based on Kohler’s ternary solution model and Miedema’s model for calculating the formation heat of binary solution, the integral equation was established for calculating the activity coefficients in ternary alloys and intermetallics. The activity coefficients for components in alloy Ti-5Al-2.5Sn, Ti-6Al-4V and intermetallics TiAl, Ti₃Al and Ti₂AlNb were calculated with the equations. The calculated data coincide well with the experimental ones found in literatures. According to the calculated activity coefficients and activities, it can be predicted that the interfacial reaction in SiC/Ti₃Al composite is more severe than that in composites SiC/Ti₂AlNb and SiC/TiAl.