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Microalloying Effect on the Precipitation Processes of Mg-Ca Alloys

  • Symposium: Approaches for Investigating Phase Transformations at the Atomic Scale
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Abstract

The Mg-Ca binary alloys in the Mg-Mg2Ca two-phase region show little precipitation hardening by aging. However, the Mg-Ca alloys microalloyed with Al and Zn result in notable age hardening because of the formation of metastable, internally ordered, plate-like Guinier–Preston (GP) zones on the basal plane. To enhance the age-hardening response, we explored microalloying elements that can alter the habit plane from basal to prismatic. We found that an indium addition causes the homogeneous precipitation of thin plates on prismatic planes, resulting in a pronounced age-hardening response. Based on transmission electron microscopy and atom probe analysis results, we discuss the structure of the GP zones and the possible origin of the habit plane alternation.

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Acknowledgments

This work was in part supported by the Grant-in-Aid for Scientific Research (B), 21360348, 2009, and by World Premier International Research Center for Materials Nanoarchitectonics, MEXT. The 3DAP work was supported by CREST-JST. This work was also partially supported by the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Industry, Trade and Energy, Center for Nanostructured Materials Technology under the 21st Century Frontier R&D Programs of the Ministry of Science and Technology, Korea through the Korea Institute of Science and Technology.

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  1. Keiichiro Oh-Ishi (Adjunct Associate Professor)

    Present address: Nagaoka University of Technology, Nagaoka, 940-2188, Japan

Authors and Affiliations

  1. National Institute for Materials Science, Tsukuba, 305-0047, Japan

    Chamini L. Mendis (Post Doctoral Researcher), Keiichiro Oh-Ishi (Adjunct Associate Professor) & Kazuhiro Hono (Manager of Magnetic Materials Unit)

Authors
  1. Chamini L. Mendis
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  2. Keiichiro Oh-Ishi
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  3. Kazuhiro Hono
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Correspondence to Chamini L. Mendis.

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Manuscript submitted June 27, 2011.

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Mendis, C.L., Oh-Ishi, K. & Hono, K. Microalloying Effect on the Precipitation Processes of Mg-Ca Alloys. Metall Mater Trans A 43, 3978–3987 (2012). https://doi.org/10.1007/s11661-011-1049-5

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