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Development of Very High Strength and Ductile Dilute Magnesium Alloys by Dispersion of Quasicrystal Phase

  • Symposium: Processing-Microstructure-PropertyRelationships & Deformation Mechanisms of Magnesium Alloys
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Abstract

Very high strengths, with tensile yield strength from 377 to 405 MPa, combined with elongation to failure of over 12 pct, have been achieved in Mg-Zn-Y dilute alloys by direct extrusion. Alloys Mg-6xZn-xY, where x = 0.2, 0.35, and 0.5 (at. pct) were chill cast in a steel mold and direct extruded at a temperature in the range 508 K to 528 K (235 °C to 255 °C), which produced an average grain size of about 1 μm. Quasicrystalline i-phase particles were dispersed in the matrix with size ranging from 50 nm to 1 μm. In addition, high density of nano-precipitates of average size 15 nm was dispersed in matrix. Thus we have developed magnesium alloys of very high strength combined with ductility by a simple process using extrusion with very little addition of yttrium.

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Acknowledgments

The authors thank Ms. Reiko Komatsu for technical support.

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Authors and Affiliations

  1. Microstructure Design Group, Structure Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    Alok Singh (Chief Researcher)

  2. Structure Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    Yoshiaki Osawa (Chief Researcher)

  3. Toughness Design Group, Structure Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    Hidetoshi Somekawa (Senior Researcher)

  4. Department of Mechanical Engineering, Kobe University, 1-1 Rokkadai, Kobe, Kobe

    Toshiji Mukai (Professor)

  5. Materials and Processes, Boeing Research and Technology, The Boeing Company, Huntington Beach, CA, USA

    Catherine J. Parrish (Engineer)

  6. Boeing Research and Technology, The Boeing Company, St. Louis, MO, USA

    Donald S. Shih (Technical Fellow)

Authors
  1. Alok Singh
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  2. Yoshiaki Osawa
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  3. Hidetoshi Somekawa
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  4. Toshiji Mukai
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  5. Catherine J. Parrish
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  6. Donald S. Shih
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Corresponding author

Correspondence to Alok Singh.

Additional information

Manuscript submitted June 27, 2013.

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Singh, A., Osawa, Y., Somekawa, H. et al. Development of Very High Strength and Ductile Dilute Magnesium Alloys by Dispersion of Quasicrystal Phase. Metall Mater Trans A 45, 3232–3240 (2014). https://doi.org/10.1007/s11661-013-2056-5

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  • DOI: https://doi.org/10.1007/s11661-013-2056-5

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