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Journal of Materials Science

, Volume 45, Issue 3, pp 719–724 | Cite as

Effect of initial microstructures on hot forging of Ca-containing cast Mg alloys

  • Masataka HakamadaEmail author
  • Kazunori Shimizu
  • Tomokazu Yamashita
  • Akira Watazu
  • Naobumi Saito
  • Hajime Iwasaki
Article

Abstract

Two cast noncombustible Mg–9Al–1Zn–1Ca alloys (composition in mass%) with coarse and fine initial microstructures were hot forged by compression at temperatures of 523–603 K and a true strain rate of 1–10−2 s−1. The compressive stress–strain curves for the two alloys were similar and typical of metals undergoing dynamic recrystallization (DRX). The alloy with the coarse initial microstructure suffered from edge crack formation during hot forging, while the alloy with the fine initial microstructure exhibited smooth peripheral surfaces after hot forging at temperatures of 573 K and above. The reduction of grain size by DRX was similar in the two hot-forged alloys, but the recrystallized volume fraction was lower in the alloy with the coarse initial microstructure. Insoluble second phases (seemingly Al2Ca) provide additional DRX sites, and thus it is expected that the finer initial cast microstructure will improve the microstructure in the resulting hot-forged Mg parts.

Keywords

Initial Microstructure True Strain Rate Alloy Part Microstructural Length Constant True Strain Rate 

Notes

Acknowledgement

This study was conducted with the financial support of the Forged Magnesium Parts Technological Development Project, which is organized by New Energy and Industrial Technology Development Organization (NEDO), Japan.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Masataka Hakamada
    • 1
    Email author
  • Kazunori Shimizu
    • 2
  • Tomokazu Yamashita
    • 2
  • Akira Watazu
    • 1
  • Naobumi Saito
    • 1
  • Hajime Iwasaki
    • 3
  1. 1.Materials Research Institute for Sustainable DevelopmentNational Institute of Advanced Industrial Science and Technology (AIST)NagoyaJapan
  2. 2.Magnesium Coordination DepartmentSankyo Material, Inc.TakaokaJapan
  3. 3.The Materials Process Technology CenterTokyoJapan

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