Investigation on the temperature-dependent diffusion growth of intermetallic compounds in the Mg-Al-Zn system:Experiment and modeling  

作　　者：Kaiming Cheng Yan Zheng Jiaxing Sun Yafei Zhao Jin Wang Huan Yu Dongqing Zhao Hang Li Jixue Zhou Zhenyu Ma Junmin Wang Cuiping Guo Xitao Wang Lijun Zhang Yong Du 

机构地区：[1]Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials,Advanced Materials Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan,250014,China [2]Laboratory of Materials Phase Equilibria and New Materials Design,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]Technology R&D Center,Shandong Qiangang Metal Technology Co.,Ltd,Jining,272000,China [4]State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,China

出　　处：《Journal of Magnesium and Alloys》2024年第8期3394-3408,共15页镁合金学报（英文）

基　　金：funded by the National Natural Science Foundation of China(No.51801116 and 52001176);the Shandong Province Key Research and Development Plan(No.2019GHZ019 and 2021SFGC1001);the Youth Innovation and Technology Support Program of Shandong Provincial Colleges and Universities(No.2020KJA002).

摘　　要：With the rapid development of Mg alloys,deeper understanding to the thermodynamic and diffusional kinetic behavior of intermetallic compounds(IMCs)is important for studying the effect of alloying elements to the microstructure evolution.Specially,a systematic quantitative investigation on the diffusional growth of IMCs is of great necessity.However,the works studying the elemental diffusion behaviors of multiple-element IMCs are rare in magnesium alloy systems.The current work takes the ternary Mg-Al-Zn system as research target,and combines the diffusion couple technique,phase stability diagrams,in-situ observation technique and numerical inverse method to investigate the temperature-dependent kinetic coefficients.The parabolic growth constant(PGC)and interdiffusion coefficients for Mg solid-solution phase andγ-Mg_(17)Al_(12),β-Mg_(2)Al_(3),ε-Mg_(23)Al_(30),MgZn_(2),Mg_(2)Zn_(3),τ-Mg_(32)(Zn,Al)49 andφ-Mg_(5)Zn_(2)Al_(2) IMCs in the Mg-Al-Zn alloy system are determined.By comparing the current experimental with calculation results,the rate-controlling factor of the temperature-dependent diffusion growth ofφ,τandεternary IMCs in the Mg-Al-Zn system is further discussed in detail.

关 键 词：Diffusion couple Phase stability diagram Numerical inverse method(NIM) Interface migration High-temperature laser-scanning confocal microscopy(HTLSCM) 

分 类 号：TG146.22[一般工业技术—材料科学与工程]