Abstract
The microstructures and mechanical properties of the Mg88.5Zn5Y6.5-XREX (RE = Yb and Ce, X = 0, 1.5, 3.0, and 4.5) (wt.%) alloys were investigated in the present study. Mg88.5Zn5Y6.5 is composed of three phases, namely, α-Mg, long-period stacking ordered (LPSO) phases, and intermetallic compounds. The content of the LPSO phases decreased with the addition of Ce and Yb, and no LPSO phases were detected in Mg88.5Zn5Y2.0Yb4.5. The alloys containing the LPSO phases possessed a stratified microstructure and exhibited excellent mechanical properties. Mg88.5Zn5Y5.0Ce1.5 exhibited the highest creep resistance and mechanical strength at both room temperature and 200 °C, owing to its suitable microstructure and high thermal stability. The yield strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature was 358 MPa. The ultimate tensile strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature and 200 °C was 453 MPa and 360 MPa, respectively.
Highlights
Microstructures and MechanicalMagnesium alloys are the lightest metallic materials that are commercially utilized in the automotive industry to lower the emission of carbon dioxide that causes global warming [1,2,3]
Mg88.5 Zn5 Y6.5 comsity α-Mg, of theMg peaks of the long-period stacking ordered (LPSO) phases decreased with the increase in the content prised
The microstructures and mechanical properties of the Mg-Zn-Y-RE alloys were inThe microstructures and mechanical properties of the Mg-Zn-Y-RE alloys were invesvestigated in this study
Summary
Magnesium alloys are the lightest metallic materials that are commercially utilized in the automotive industry to lower the emission of carbon dioxide that causes global warming [1,2,3]. These alloys exhibit low mechanical strength at both room temperature and high temperature, which restricts their application [4,5]. There have been extensive studies on the development of techniques to optimize the mechanical properties of Mg alloys. The Mg-RE (RE—rare earth) series alloys have attracted significant attention in recent years owing to their outstanding heat resistance and mechanical properties [8,9,10]. Longperiod stacking ordered (LPSO) phases, which possess a special structure and excellent strengthening ability, in Mg-Zn-Re alloys have become a subject of intense research [11]
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