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Solidification Pathways of Alloys in the Mg-Rich Corner of the Mg-Al-Ba Ternary System

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Abstract

An experimental investigation of the solidification reactions and microstructures of alloys in the Mg-rich corner of the Mg-Al-Ba ternary system has been conducted. Four distinct exothermic reactions involving the formation of α-Mg, Mg17Ba2, Mg17Al12, and a fourth phase designated as τ were observed and their onset temperatures were recorded as functions of composition. Using compositional and microstructural analysis, the Mg17Ba2 intermetallic was found to have significant solubility of Al, up to 20 at. pct. The solidification pathways of the investigated alloys involved both a Class I and Class II equilibrium reaction. A flow block diagram that outlines the observed solidification reactions is presented and discussed in reference to cast microstructures.

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Acknowledgments

The authors would like to acknowledge the financial assistance of the National Science Foundation under award number DMR-0845868 and the Department of Energy Office of Science Graduate Fellowship Program, administered by ORISE-ORAU (Contract #: DE-AC05-06OR23100).

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Authors and Affiliations

  1. Materials Science and Engineering Department, University of Florida, Gainesville, FL, 32611, USA

    Zachary L. Bryan (Graduate Student, Test Design Engineer), Ryan J. Hooper (Graduate Student), Hunter B. Henderson (Post-Doctoral Scholar) & Michele V. Manuel (Associate Professor)

  2. Exactech, Gainesville, FL, USA

    Zachary L. Bryan (Graduate Student, Test Design Engineer)

Authors
  1. Zachary L. Bryan
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  2. Ryan J. Hooper
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  3. Hunter B. Henderson
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  4. Michele V. Manuel
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Correspondence to Michele V. Manuel.

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Manuscript submitted August 3, 2014.

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Bryan, Z.L., Hooper, R.J., Henderson, H.B. et al. Solidification Pathways of Alloys in the Mg-Rich Corner of the Mg-Al-Ba Ternary System. Metall Mater Trans A 46, 1689–1696 (2015). https://doi.org/10.1007/s11661-014-2730-2

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  • DOI: https://doi.org/10.1007/s11661-014-2730-2

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