Thermodynamic analysis of as-cast and heat treated microstructures of Mg-Ce-Nd alloys

Mark A. Easton, Suming Zhu, Mark A. Gibson, Jian-Feng Nie, Joachim Gröbner, Artem Kozlov, Rainer Schmid-Fetzer

Research output: Chapter in Book/Report/Conference proceedingConference PaperOtherpeer-review

Abstract

The phase relationships in the Mg-rich corner of the Mg-Ce-Nd system have been investigated through the evaluation of selected compositions in the as-cast and heat-treated condition. Consistent thermodynamic CALPHAD-type assessments have also been generated for the Mg-Ce-Nd system [1]. It is shown that this system reveals a significant degree of meta-stability under technologically relevant solidification conditions (i.e., permanent-mould or high pressure die casting). This is simulated in thermodynamic calculations by suppression of the RE5Mg41 phase and reasonable agreement is found with the as-cast microstructures. After heat treatment these microstructures transform, depending on alloy composition, into phase assemblies consistent with the calculated stable equilibrium phase diagram. It is the elucidation of such meta-stable phase formation and the subsequent transformation from the as-cast to the heat treated state that is a particular strength of the thermodynamic approach and which makes it a powerful tool for alloy development.

Original languageEnglish
Title of host publicationMagnesium Technology 2011
Subtitle of host publicationHeld during TMS 2011 Annual Meeting & Exhibition, San Diego, California, USA, February 27-March 3, 2011
EditorsWim H. Silleken, Sean R Agnew, Neale R. Neelameggham, Suveen N. Mathaudhu
Place of PublicationHoboken NJ USA
PublisherJohn Wiley & Sons
Pages167
Number of pages1
ISBN (Print)9781118029367
DOIs
Publication statusPublished - 26 Apr 2011
EventMagnesium Technology Symposium 2011 - San Diego, United States of America
Duration: 27 Feb 20113 Mar 2011
https://onlinelibrary.wiley.com/doi/book/10.1002/9781118062029 (Proceedings)

Conference

ConferenceMagnesium Technology Symposium 2011
CountryUnited States of America
CitySan Diego
Period27/02/113/03/11
Internet address

Keywords

  • CALPHAD
  • Casting
  • Isothermal heat treatments
  • Rare earth

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