| [Luo Yulun,Zhang Dingfei,Hua Jianrong,Dai Qimin,Zhong Shiyu,Xu Junyao,Hu Guangshan,Jiang Bin and 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.] |
| Effect of High Y Addition on Microstructure and Mechanical Properties of Mg-2Zn-1Mn Alloy |
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| Received:March 05, 2022 Revised:September 04, 2022 |
| DOI： |
| Key words: Mg-Zn-Mn-Y microstructure mechanical properties texture |
| Foundation item: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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| Abstract: |
| 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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