ملخص: The analysis of dilatometric and calorimetric curves, completed by optical microscopy observations, permitted to follow the kinetics and the morphology changes of [beta]′-phase particles during ageing of Al-12 wt.% Mg alloy. It is now well established that [beta]′-phase particles, which are semi-coherent and metastable, appear initially in a globular shape, transform into thin needles, then into particles of the equilibrium [beta]-phase after a long ageing time, as predicted by the phase diagram. In addition, [beta]′ and [beta]-phases are formed and dissolved successively and independently one of the other, during non-isothermal ageing.

لغة: إنجليزية