Phase stability and formation in Mg–Gd–Zn alloys—key data for ICME of Mg alloys

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

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


Thermodynamic databases of multicomponent alloy systems are the indispensable basis to apply and develop ICME of Mg alloys. Among the multicomponent Mg alloys with rare earths (RE) and Zn the Mg–Gd–Zn system is found to be a prime example of complex phase formation, both under stable and metastable conditions. This alloy system was studied by a combination of dedicated experiments and thermodynamic modeling. Two metastable phases, I and H2, have been identified in as-cast Mg-rich Mg–Gd–Zn alloys by TEM characterization. Quantitative thermodynamic descriptions of the metastable Mg–Gd–Zn phases and metastable phase diagrams are developed, embedded in a complete Calphad modeling of all stable phases. Dedicated thermodynamic calculations using constrained Scheil solidification simulation reveal conditions for I and H2 phase formation and transformation.

Original languageEnglish
Title of host publicationMagnesium Technology 2017
EditorsNeale R. Neelameggham, Alok Singh, Kiran N. Solanki, Dmytro Orlov
Number of pages7
ISBN (Print)9783319523910
Publication statusPublished - 2017
EventMagnesium Technology Symposium 2017 - San Diego, United States of America
Duration: 26 Feb 20172 Mar 2017 (Proceedings)

Publication series

NameMinerals, Metals and Materials Series
VolumePart F8
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696


ConferenceMagnesium Technology Symposium 2017
Country/TerritoryUnited States of America
CitySan Diego
Internet address


  • Constrained scheil simulation
  • Magnesium alloys
  • Stable and metastable phases
  • Thermodynamics

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