| METALS AND METAL MATRIX COMPOSITES |
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| Mg-4Sm-Al-0.3Mn-xZn Alloys |
| ZHENG Yuan1,2, CAI Zhongyi1,2, CHENG Liren3, CHE Chaojie1,2, ZHANG Hongjie3
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1 Roll Forging Research Institute, Jilin University, Changchun 130025
2 College of Materials Science and Engineering, Jilin University, Changchun 130025
3 State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 |
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Abstract Microstructures and mechanical properties of as-cast and as-extruded Mg-4Sm-Al-0.3Mn-xZn(x=0, 1, 2, 3) (mass fraction) alloys were investigated by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and tensile testing machine. The Mg-Al-Sm ternary precipitated phase were observed in as-cast and solution-treated alloys. It is a precipitation phase with hexagonal structure with a=0.556 nm, c=0.521 nm. The orientation relationship between the phase and the magnesium matrix is [0001]Mg-Al-Sm‖[0001]α-Mg,[1010]Mg-Al-Sm‖[1120]α-Mg.The atomic ratio for Mg∶Al∶Sm is 98.73∶0.71∶0.56. The as-cast Mg-4Sm-Al-0.3Mn-3Zn alloy exhibits the best tensile properties with yield strength of 96 MPa, tensile strength of 138 MPa and elongation of 7.2%. The as-extruded Mg-4Sm-Al-0.3Mn-2Zn alloy exhibits the best tensile properties. The yield strength, tensile strength and elongation are 269 MPa, 298 MPa and 16%, respectively.
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Published: 28 April 2019
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| About author:: Yuan Zheng, master student of Jilin University, the main research direction is rare earth magnesium alloy.; Zhongyi Cai, professor of Jilin University. Research directions are materials plastic forming and finite element theory. |
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2019, Vol. 33 
