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Acta Metallurgica Sinica (English Letters)

, Volume 32, Issue 2, pp 205–217 | Cite as

Effect of Partially Substituting Ca with Mischmetal on the Microstructure and Mechanical Properties of Extruded Mg–Al–Ca–Mn-Based Alloys

  • Chao XuEmail author
  • Taiki Nakata
  • Guo-Hua Fan
  • Kosuke Yamanaka
  • Guang-Ze TangEmail author
  • Lin Geng
  • Shigeharu Kamado
Article
  • 44 Downloads

Abstract

Mg-2Al-1.2Ca-0.2Mn (at%)-based alloys with Ce-rich mischmetal (MM) substitution of 0–0.6 at% for Ca were hot extruded at 400 °C. The effect of MM substitution on the microstructure and mechanical properties of the extruded alloys was investigated. The as-cast Mg-2Al-1.2Ca-0.2Mn alloy is mainly composed of α-Mg, Mg2Ca and (Mg,Al)2Ca phases and Al8Mn5 precipitates, whereas the substitution of MM brings about the formation of Al11MM3, Al2MM phases and Al10MM2Mn7 particles with the absence of (Mg,Al)2Ca phase. The volume fraction of MM-containing phases increases with increasing MM contents. All of the extruded alloys exhibit bimodal microstructure comprising fine dynamically recrystallized grains with almost random orientation and coarse deformed grains with strong basal texture. Dense nanosized planar Al2Ca and spherical Al–Mn phases precipitate inside the deformed grains. High tensile yield strengths of ~ 350 MPa and moderate elongations to failure of > 12% are obtained in all extruded alloys; the MM substitution induces negligible difference in the tensile properties at ambient temperature, while the highest MM substitution improves the strength at 180 °C due to the better thermal stability of the fragmented MM-containing phases.

Keywords

Magnesium alloys Extrusion Microstructures Precipitation Mechanical properties 

Notes

Acknowledgements

This work is supported by JSPS Grant-in-Aid for Young Scientists (B), 16K18266, JST Advanced Low Carbon Technology Research and Development Program (ALCA), 12102886.

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Copyright information

© The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Chao Xu
    • 1
    Email author
  • Taiki Nakata
    • 2
  • Guo-Hua Fan
    • 1
  • Kosuke Yamanaka
    • 2
  • Guang-Ze Tang
    • 1
    Email author
  • Lin Geng
    • 1
  • Shigeharu Kamado
    • 2
  1. 1.School of Materials Science and EngineeringHarbin Institute of TechnologyHarbinChina
  2. 2.Department of Mechanical EngineeringNagaoka University of TechnologyNagaokaJapan

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