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Effect of High Y Addition on Microstructure and Mechanical Properties of Mg-2Zn-1Mn Alloy

1.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;2.National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing University, Chongqing 400044, China;3.College of Information Science and Engineering, Jiaxing University, Jiaxing 314001 China

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National Key Research and Development Program of China (2019YFC1520303); Natural Science Foundation of Zhejiang Province (LQ18E010003); Chongqing Science and Technology Commission (cstc2019jscx-mbdxX0031)

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    The microstructure and mechanical properties of Mg-2Zn-1Mn-xY (x=0, 1, 3, 5, 7, wt%) alloy were studied by optical microscope (OM), X-ray diffractometer (XRD), X-ray fluorescence spectrometer (XRF), electron probe microanalyzer (EPMA), scanning electron microscope (SEM), electron backscatter diffractometer (EBSD), transmission electron microscope (TEM), and uniaxial tensile tests. Results show that the secondary phases of as-cast alloys are changed from Mg7Zn3 to Mg3Zn3Y2 and finally transformed to Mg12ZnY with the addition of Y element. Although Y addition hinders the dynamic recrystallization process and therefore refines the grains, the excess Y addition cannot further refine the grains. Meanwhile, the ductility of as-extruded Mg-2Zn-1Mn alloy is increased and then decreased with the addition of Y element, which may be attributed to the synergistic effect of texture orientation and grain coarsening. Besides, the strength enhancement is mainly attributed to grain refinement strengthening and secondary phase strengthening. The Mg-2Zn-1Mn-7Y alloy has the optimal mechanical properties: the ultimate tensile strength is 357 MPa, yield strength is 262 MPa, and elongation is 14%.

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[Luo Yulun, Zhang Dingfei, Hua Jianrong, Dai Qimin, Zhong Shiyu, Xu Junyao, Hu Guangshan, Jiang Bin, Pan Fusheng. Effect of High Y Addition on Microstructure and Mechanical Properties of Mg-2Zn-1Mn Alloy[J]. Rare Metal Materials and Engineering,2023,52(1):54~62.]
DOI:10.12442/j. issn.1002-185X.20220172

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  • Received:March 05,2022
  • Revised:September 04,2022
  • Adopted:September 27,2022
  • Online: February 09,2023
  • Published: February 08,2023