A general thermodynamic model for the long-period stacking ordered phases in magnesium alloys

Kai Xu; Shuhong Liu; Keke Chang; Yongpeng Liang; Yong Du; Zhanpeng Jin

Journal of Magnesium and Alloys (Jan 2021)

A general thermodynamic model for the long-period stacking ordered phases in magnesium alloys

Kai Xu,
Shuhong Liu,
Keke Chang,
Yongpeng Liang,
Yong Du,
Zhanpeng Jin

Affiliations

Kai Xu: Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China; Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha, Hunan 410083, China
Shuhong Liu: Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha, Hunan 410083, China; Corresponding authors.
Keke Chang: Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China; Corresponding authors.
Yongpeng Liang: Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha, Hunan 410083, China
Yong Du: Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha, Hunan 410083, China
Zhanpeng Jin: School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China

Journal volume & issue: Vol. 9, no. 1
pp. 144 – 155

Abstract

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A thermodynamic model Mgx(Xs, Mg)6(Xl, Mg)8 (Xs and Xl are elements smaller and larger than Mg) for long-period stacking ordered phases (LPSOs) was proposed based on two key factors: the Xs6Xl8-type L12 clusters and the variation of chemical compositions. In general, all available LPSOs can be described with this model. As a representative system, Mg-Y-Zn with three LPSOs was investigated using the CALPHAD (calculation of phase diagram) approach aided with first-principles calculations. Two new three-phase equilibria were predicted and were validated by key experiments. The model-based descriptions will be the basis for the research and development of magnesium alloys.

Published in Journal of Magnesium and Alloys

ISSN: 2213-9567 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/journal-of-magnesium-and-alloys/

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Abstract

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