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Effect of Initial Grain Size on Microstructure and Mechanical Properties of Extruded Mg-9Al-0.6Zn Alloy

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Abstract

The effect of initial grain size on the microstructural evolution and tensile properties of an extruded Mg-9Al-0.6Zn alloy was investigated using homogenized billets with grain sizes of 411 and 87 μm. It is found that although dynamically recrystallized (DRXed) grains remain the same size regardless of the initial grain size, a finer-grained billet results in a significant reduction of the size and area fraction of un-DRXed grains through an increase in grain boundaries capable of acting as nucleation sites for DRX during hot extrusion. This increase in the fraction of DRXed grains, combined with more precipitates, improves the tensile yield strength of the extruded alloy. The elongation is also significantly improved, as the reduction in unDRXed grains suppresses the formation of twins that cause micro-cracks. This increased ductility subsequently results in an increase in ultimate tensile strength through continuous strain hardening.

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This research was supported by a Fundamental Research Program of the Korea Institute of Materials Science (KIMS).

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Authors and Affiliations

  1. Light Metals Team, Korea Institute of Materials Science (KIMS), Changwon, 642-831, Republic of Korea

    Sung Hyuk Park (Senior Researcher), Jun Ho Bae (Senior Researcher), Sang-Hoon Kim (Research Assistant, Master Student) & Bong Sun You (Principal Researcher, Professor)

  2. Advanced Materials Engineering, University of Science and Technology (UST), Daejeon, 305-350, Republic of Korea

    Sang-Hoon Kim (Research Assistant, Master Student) & Bong Sun You (Principal Researcher, Professor)

  3. Department of Mechanical Engineering, Hanyang University, Ansan, 426-791, Republic of Korea

    Jonghun Yoon (Assistant Professor)

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  1. Sung Hyuk Park
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  2. Jun Ho Bae
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  3. Sang-Hoon Kim
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  4. Jonghun Yoon
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  5. Bong Sun You
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Correspondence to Sung Hyuk Park.

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Manuscript submitted July 1, 2015.

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Park, S.H., Bae, J.H., Kim, SH. et al. Effect of Initial Grain Size on Microstructure and Mechanical Properties of Extruded Mg-9Al-0.6Zn Alloy. Metall Mater Trans A 46, 5482–5488 (2015). https://doi.org/10.1007/s11661-015-3164-1

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  • DOI: https://doi.org/10.1007/s11661-015-3164-1

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