Effects of Ce Addition on Mechanical and Corrosion Properties of the As-Extruded Mg-Zn-Ca Alloy
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JMEPEG https://doi.org/10.1007/s11665-020-05318-3
Effects of Ce Addition on Mechanical and Corrosion Properties of the As-Extruded Mg-Zn-Ca Alloy Yuzhou Du
, Dongjie Liu, and Yanfeng Ge
Submitted: 14 May 2020 / Revised: 11 October 2020 / Accepted: 1 November 2020 The microstructure and corrosion properties of the as-extruded Mg-Zn-Ca alloy with and without Ce addition are investigated. The microstructure was characterized by optical microscopy, scanning electron microscopy coupled with electron backscatter diffraction detector. Ce addition retarded dynamic recrystallization during deformation, which resulted in the formation of bimodal microstructure with finely dynamically recrystallized (DRXed) grains and coarsely unDRXed grains. Texture of the DRXed region was weakened after small addition of Ce, mainly attributing to particle stimulated nucleation. The strength enhancement for the Ce containing Mg-Zn-Ca alloy was attributed to the fine microstructure and strong texture. Corrosion results indicated that Ce addition deteriorated corrosion resistance in 3.5 wt.% NaCl solution of the as-extruded Mg-Zn-Ca alloy, which was related to the dispersed second phases, refined microstructure and weak basal texture in DRXed region. Keywords
corrosion behavior, mechanical properties, Mg alloy, Recrystallization, Texture
1. Introduction Mg and its alloys as engineering materials are considered to be the most potential materials in the twenty-first century due to their low density (Ref 1). However, the poor mechanical properties of Mg alloys compared with Al alloys, restrict commercial usage. Therefore, various methods, such as microalloying and thermomechanical processes, have been proposed to improve the mechanical properties of Mg alloys (Ref 2). For example, a high yield strength (360-440 MPa) was achieved for the as-extruded Mg-2Sn-2Ca (wt.%) alloy (Ref 3). Simultaneously, it should be noted that the microstructure optimization aiming to enhance strength also has a significant effect on corrosion behavior (Ref 4), which is another weakness of Mg alloys because of their highly electronegative potential (Ref 5). Therefore, improving corrosion resistance by microalloying reducing the activity of Mg alloys (Ref 6), heat treatment (Ref 7) or surface treatment (Ref 8) has been widely investigated. For instance, the mechanical and corrosion resistance of Mg-5Sn-2Zn-0.1Mn (wt.%) alloy was simultaneously improved by solution treatment (Ref 7). Recently, Mg-Zn-Ca alloys are suggested to be low-cost Mg alloy because of the abundant resources of Zn and Ca (Ref 9), and Ca addition is capable of weakening basal texture intensity of Mg-Zn alloy (Ref 10). Mg-Zn-Ca based alloys, such as MgZn-Ca-Mn (Ref 11), Mg-Zn-Ca-Zr (Ref 12) and Mg-Zn-Ca-RE Yuzhou Du, Dongjie Liu, and Yanfeng Ge, School of Materials Science and Engineering, XiÕan University of Technology, XiÕan 710048, PeopleÕs Republic of China; and Shaanxi Province Engineering Research Center for Magnesium Alloy, XiÕan University of Technology, XiÕan 710048, PeopleÕs Republic of China
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