An energy dispersive X-ray diffraction method to observe phase transitions is applied to follow the crystallization of an amorphous alloy (La6Ni5Al89) in isothermal conditions. In this way, the diffraction-based configurational entropy (DCE) of the system undergoing the phase transformations was measured and the curves describing the transitions, qualitatively equivalent to a differential scanning calorimetry (DSC) thermogram, could be drawn. Finally, the analysis of such curves allowed calculation of some points of the alloy pressure-time-temperature transformation (PTTT) diagram. More importantly, the present work shows that the DCE method can be successfully applied even when DSC can no longer be used. As a consequence, regions of the phase diagram that could not be reached up to now become accessible, opening the way to the study of transition phenomena under extreme conditions.
|Journal||Chemistry of Materials|
|Publication status||Published - 2005|
Paci, B., Rossi-Albertini, V., Sikorski, M., Roseker, W., Qian, D., & Jiang, J. (2005). Study of the pressure-time-temperature transformation of amorphous La6Ni5Al89 by the energy dispersive method for phase transition. Chemistry of Materials, 17(25), 6323-6326.