A General Thermodynamic Model for the Long-Period Stacking Ordered Phases in Magnesium Alloys

29 Pages Posted: 7 Aug 2019

See all articles by Kai Xu

Kai Xu

Chinese Academy of Sciences (CAS) - Ningbo Institute of Material Technology and Engineering; Central South University - Science and Technology on High Strength Structural Materials Laboratory

Shuhong Liu

Central South University - Science and Technology on High Strength Structural Materials Laboratory

Keke Chang

Chinese Academy of Sciences (CAS) - Ningbo Institute of Material Technology and Engineering

Yongpeng Liang

Central South University - Science and Technology on High Strength Structural Materials Laboratory

Yong Du

Central South University - Science and Technology on High Strength Structural Materials Laboratory

Zhanpeng Jin

Central South University - School of Material Science and Engineering

Abstract

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.

Keywords: LPSOs, Thermodynamic model, Formation enthalpy, CALPHAD, solidification

Suggested Citation

Xu, Kai and Liu, Shuhong and Chang, Keke and Liang, Yongpeng and Du, Yong and Jin, Zhanpeng, A General Thermodynamic Model for the Long-Period Stacking Ordered Phases in Magnesium Alloys. Available at SSRN: https://ssrn.com/abstract=3431837 or http://dx.doi.org/10.2139/ssrn.3431837

Kai Xu (Contact Author)

Chinese Academy of Sciences (CAS) - Ningbo Institute of Material Technology and Engineering

Ningbo, 315201
China

Central South University - Science and Technology on High Strength Structural Materials Laboratory

China

Shuhong Liu

Central South University - Science and Technology on High Strength Structural Materials Laboratory

China

Keke Chang

Chinese Academy of Sciences (CAS) - Ningbo Institute of Material Technology and Engineering

Ningbo, 315201
China

Yongpeng Liang

Central South University - Science and Technology on High Strength Structural Materials Laboratory

China

Yong Du

Central South University - Science and Technology on High Strength Structural Materials Laboratory

China

Zhanpeng Jin

Central South University - School of Material Science and Engineering

Changsha, Hunan 410083
China

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