Thermodynamics of Mg-Zn-Zr: Implication on the effect of Zr on grain refining of Mg-Zn alloys

Raymundo Arroyave, Zi Kui Liu

Research output: Contribution to journalConference article

4 Scopus citations

Abstract

Due to their high specific strength, magnesium alloys have become increasingly attractive for automotive structural applications. It has previously been shown that Zr is a very effective grain refiner of Mg-Zn alloys. In this work, we present a thermodynamic model of the Mg-Zn-Zr system based on the CALPHAD method. Using this model, the influence of Zn additions on the grain size of Mg-Zr alloys is discussed based on the thermodynamic properties of the Mg-Zn-Zr ternary. Calculations of the liquidus surfaces and equilibrium solidification are performed and related to experimental observations. The possible formation of metastable intermetallic phases during solidification and heat treatment is also discussed. Solubility of Zr in Mg-Zn-Zr alloys as well as phase fractions of intermetallic compounds are systematically studied as these parameters greatly affect grain refining.

Original languageEnglish (US)
Pages (from-to)203-208
Number of pages6
JournalMagnesium Technology
StatePublished - Sep 27 2005
Event2005 TMS Annual Meeting - San Francisco, CA, United States
Duration: Feb 13 2005Feb 17 2005

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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