The dependence of creep behavior on elemental partitioning in Mg-5Al-3Ca-xSn alloys

Jessica R. Terbush, Olivia H. Chen, J. Wayne Jones, Tresa M. Pollock

Research output: Contribution to journalArticlepeer-review


Cast Mg-5Al-3Ca-xSn alloys have been examined to investigate the effect of Sn additions on elemental partitioning during solidification, microstructure development, and compressive creep behavior at 453 K (180 C). Alloys containing 0.25 to 3.0 wt pct Sn were cast with a permanent mold technique. The addition of 0.75 to 1.0 wt pct Sn had a beneficial effect on Ca partitioning to the a-Mg phase. Additions beyond 1 wt pct Sn resulted in the formation of an orthorhombic Mg-Ca-Sn phase, with decreased Ca partitioning to the a-Mg. A lower minimum creep rate was observed for the Mg-5Al-3Ca-xSn alloy with increased Ca partitioning. Consistent with this finding, analyses that consider the influence of solute and precipitation strengthening on creep in Mg-5Al-3Ca-xSn alloys suggest that Ca in the a-Mg contributes to a greater degree than Al in solution to the creep resistance at 453 K (180 C).

Original languageEnglish (US)
Pages (from-to)3120-3134
Number of pages15
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number9
StatePublished - Sep 2012
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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