On the thermodynamics and kinetics of electropulsing induced dissolution of β-Mg17Al12 phase in an aged Mg-9Al-1Zn alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)4797-4808
Journal / PublicationActa Materialia
Volume57
Issue number16
Publication statusPublished - Sep 2009

Abstract

Electropulsing induced dissolution of β-Mg17Al12 phase was investigated using scanning electron microscopy, X-ray diffraction and hardness tests. It was found that compared with conventional heat treatment, electropulsing treatment (EPT) decreased the apparent solid solution temperature of the β phase and accelerated the dissolution of β phase into α-matrix in a very short time of several seconds due to reduction of the nucleation thermodynamic barrier and enhancement of atomic diffusion, respectively. A model for the temperature field of a strip under EPT was established. Based on the contributions of the coupling of the thermal and athermal effects with the free energy and the direct electron-atom interactions, the thermodynamics and kinetics of the electropulsing induced dissolution of β-Mg17Al12 are discussed. © 2009 Acta Materialia Inc.

Research Area(s)

  • Electropulsing treatment, Magnesium alloys, Phase transformation kinetics