Experimental Investigation and Thermodynamic Verification for the Phase Relation around the ε-Mg<sub>23</sub> (Al, Zn)<sub>30</sub> Intermetallic Compound in the Mg-Zn-Al System

The appearance of the ε phase during the welding process can severely weaken the welding strength of dissimilar metals of Mg-Zn-Al alloy systems. An understanding of the accurate phase diagram, especially the equilibrium phase relation around the ε phase, is thus of particular importance. However, t...

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Autores principales: Yan Zheng, Jiaxing Sun, Kaiming Cheng, Jin Wang, Chengwei Zhan, Jingrui Zhao, Xitao Wang, Shouqiu Tang, Jixue Zhou, Lijun Zhang, Yong Du
Formato: article
Lenguaje:EN
Publicado: MDPI AG 2021
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Acceso en línea:https://doaj.org/article/5881e04052a341568b0490926c89df56
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Sumario:The appearance of the ε phase during the welding process can severely weaken the welding strength of dissimilar metals of Mg-Zn-Al alloy systems. An understanding of the accurate phase diagram, especially the equilibrium phase relation around the ε phase, is thus of particular importance. However, the phase interrelation near the <i>ε</i>-Mg<sub>23</sub>(Al, Zn)<sub>30</sub> phase has not yet been fully studied. In this work, the local phase diagrams of the ε phase and its surrounding phases in the Mg-Zn-Al system are systematically determined by experimental investigation and thermodynamic verification. Five Mg-Zn-Al alloys and one diffusion couple were fabricated and analyzed to get accurate phase constituents and relationships adjacent to ε phase. The current experimental data obtained from Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC), and Electron Probe Micro Analysis (EPMA) were further compared with the thermodynamically computed phase relations around ε phase for verification, showing good agreements. Several important conclusions are drawn based on current experimental work, which can provide supporting information for the follow-up studies on ε phase in the Mg-Zn-Al alloy systems.