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利用CALPHAD技术,分别采用Turnbull和Thompson-Spaepen(TS)两种近似公式计算了Cu-Zr-Ti三元系合金过冷熔体转变为晶体相的结晶驱动力。以连续形核理论为基础,利用Davies-Uhlmann公式计算了13种成分合金的两组温度-时间-转变曲线(TTT)和临界冷却速度。计算的Cu-Zr-Ti合金的两组临界冷却速度分别为1.38×102~7.34×105K/s和0.64~1.36×104K/s。结果表明:两组计算值与实验值都定性吻合,利用TS公式计算得到的临界冷却速度更接近实验值。因此利用CALPHAD和动力学结合的方法能很好地预测Cu-Zr-Ti三元体系的玻璃形成能力(GFA)。
The CALPHAD technique was used to calculate the crystallization driving force of Cu-Zr-Ti ternary alloy undercooled melt into crystalline phase by using two approximate formulas of Turnbull and Thompson-Spaepen (TS) respectively. Based on the theory of continuous nucleation, two sets of temperature-time-transformation curves (TTTs) and critical cooling rates of 13 constituent alloys were calculated by Davies-Uhlmann formula. The calculated critical cooling rates of Cu-Zr-Ti alloy are 1.38 × 102 ~ 7.34 × 105K / s and 0.64 ~ 1.36 × 104K / s, respectively. The results show that the calculated values agree well with the experimental values, and the critical cooling rate calculated by TS formula is closer to the experimental value. Therefore, the combination of CALPHAD and kinetics can predict the glass forming ability (GFA) of Cu-Zr-Ti ternary system well.