Metals and Materials International

, Volume 24, Issue 2, pp 391–399 | Cite as

Enhancement of Mechanical Properties of Extruded Mg–9Al–1Zn–1MM–0.7CaO–0.3Mn Alloy Through Pre-aging Treatment

  • Seok Hoan Jeong
  • Yong Joo Kim
  • Kyung Ho Kong
  • Tae Hee Cho
  • Young Kyun Kim
  • Hyun Kyu Lim
  • Won Tae Kim
  • Do Hyang Kim


The effect of pre-aging treatment before extrusion has been investigated in Mg–9.0Al–1.0Zn–1MM–0.7CaO–0.3Mn alloy. The as-cast microstructure consists of α-Mg dendrite with secondary solidification phase particles, (Mg, Al)2Ca, β-Mg17Al12 and Al11RE3 at the inter-dendritic region. After extrusion, β-Mg17Al12 precipitates are present, but higher density and more homogeneous distribution in pre-aged alloy. In addition, μm-scale banded bulk β-Mg17Al12 particles are generated during extrusion. Al11RE3 particles are broken into small particles, and are aligned along the extrusion direction. (Mg, Al)2Ca particles are only slightly elongated along the extrusion direction, providing stronger particle stimulated nucleation (PSN) effect by severe deformation during extrusion. The mechanical properties can be significantly enhanced by introducing pre-aging treatment, i.e. β-Mg17Al12 precipitates provide grain refining and strengthening effects and (Mg, Al)2Ca particles provide PSN effect.


Magnesium alloy Extrusion Pre-aging Dynamic recrystallization 



This study was financially supported by the Important Defense Materials Technology Development project funded by the Korea Ministry of Industrial, Trade and Energy (Project No. NRF 10043821), Korea Government.


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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  • Seok Hoan Jeong
    • 1
  • Yong Joo Kim
    • 1
  • Kyung Ho Kong
    • 1
  • Tae Hee Cho
    • 1
  • Young Kyun Kim
    • 3
  • Hyun Kyu Lim
    • 3
  • Won Tae Kim
    • 2
  • Do Hyang Kim
    • 1
  1. 1.Department of Materials Science and Engineering, Center for Non-Crystalline MaterialsYonsei UniversitySeoulRepublic of Korea
  2. 2.Department of Optical EngineeringCheongju UniversityCheongjuRepublic of Korea
  3. 3.Rare Metal R&BD GroupKorea Institute of Industrial TechnologyIncheonRepublic of Korea

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