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Metallurgical and Materials Transactions A

, Volume 46, Issue 4, pp 1689–1696 | Cite as

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

  • Zachary L. Bryan
  • Ryan J. Hooper
  • Hunter B. Henderson
  • Michele V. Manuel
Article

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.

Keywords

Differential Scanning Calorimetry Solidification Reaction Heat Flow Curve Mg17Al12 Phase Cast Microstructure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Zachary L. Bryan
    • 1
    • 2
  • Ryan J. Hooper
    • 1
  • Hunter B. Henderson
    • 1
  • Michele V. Manuel
    • 1
  1. 1.Materials Science and Engineering DepartmentUniversity of FloridaGainesvilleUSA
  2. 2.ExactechGainesvilleUSA

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