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

作　　者：Kai Xu Shuhong Liu Keke Chang Yongpeng Liang Yong Du Zhanpeng Jin 

机构地区：[1]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 [2]Science and Technology on High Strength Structural Materials Laboratory,Central South University,Changsha,Hunan 410083,China [3]School of Materials Science and Engineering,Central South University,Changsha,Hunan 410083,China

出　　处：《Journal of Magnesium and Alloys》2021年第1期144-155,共12页镁合金学报（英文）

基　　金：This work was supported by the National Key Research and Development Plan(No.2016YFB0701202).K.Chang ac-knowledges the CAS Pioneer Hundred Talents Program.Pro-fessor Zi-Kui Liu is greatly acknowledged for the discussion about the general thermodynamic model for LPSOs.

摘　　要：A thermodynamic model Mg x(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 Xs 6 Xl 8-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.

关 键 词：LPSOs Thermodynamic model Formation enthalpy CALPHAD SOLIDIFICATION 

分 类 号：TG146.22[一般工业技术—材料科学与工程]