کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1448491 | 988675 | 2009 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Phase-field simulations of α → γ precipitations and transition to massive transformation in the Ti–Al alloy Phase-field simulations of α → γ precipitations and transition to massive transformation in the Ti–Al alloy](/preview/png/1448491.png)
A phase-field model for the solid–solid α → γ transition of Ti–Al binary alloys is presented based on analytical Gibbs free energies and couplings to the thermodynamical database ThermoCalc. The equilibrium values recover the α + γ phase boundaries. Morphological transitions from diffusive to massive (partitionless) growth are observed on increasing the initial mole fraction of aluminum. Temporal evolution of the interface shows a t behavior for diffusive and a linear behavior for massive growth, which is in accordance with theoretical predictions. An estimate of the interfacial mobility of Ti–Al based on the Burke–Turnbull equation is calculated. The expression of the mobility follows an Arrhenius law. Using the derived interfacial mobility, the calculated interfacial velocities of the massive transformation are in quantitative agreement with those observed in experiments.
Journal: Acta Materialia - Volume 57, Issue 1, January 2009, Pages 116–124