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Microstructure and mechanical properties of as-extruded and heat treated Mg-6Zn-1Mn-2Sn-0.5Ca
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    Abstract:

    The microstructures and mechanical properties of as-extruded and peak-aged Mg-6Zn-1Mn-2Sn-0.5Ca(ZMT612-0.5Ca) alloy were studied using optical microscopy (OM), X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), hardness tests and uniaxial tensile tests. The results showed that the as-cast alloy consisted of α-Mg, Mn, Mg7Zn3, Ca2Mg6Zn3 and CaMgSn phases. The as-extruded ZMT612-0.5Ca alloy presented a totally recrystallized microstructure. The average grain size of extruded alloy was ~2.8 μm. After heat treatment, the strength increased obviously, the yield strength and ultimate tensile strength of as-extruded alloy were increased to 320 and 390 MPa, respectively. Strength enhancement was attributed to the grain boundary strengthening, solid solution strengthening and precipitation strengthening.

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[Chen Xia, Zhang Dingfei, Feng JingKai, Zhao Yang, Jiang Bin, Pan Fu Sheng. Microstructure and mechanical properties of as-extruded and heat treated Mg-6Zn-1Mn-2Sn-0.5Ca[J]. Rare Metal Materials and Engineering,2020,49(9):2920~2924.]
DOI:10.12442/j. issn.1002-185X.20190542

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History
  • Received:June 27,2019
  • Revised:August 30,2020
  • Adopted:August 21,2019
  • Online: October 15,2020
  • Published: