Precipitation strengthening of a Mg-Al-Ca - Based AXJ530 die-cast alloy

A. Suzuki, N. D. Saddock, J. R. TerBush, B. R. Powell, J. W. Jones, T. M. Pollock

Research output: Contribution to journalArticlepeer-review

Abstract

Precipitation of the Al2Ca phase in theα-Mg phase of the Mg-Al-Ca-based AXJ530 die-cast alloy and the effect of precipitation hardening on the creep resistance were studied. Precipitation of the Al2Ca phase is suppressed in the die-casting process due to its high cooling rate, but precipitation was observed during subsequent isothermal heat treatments above 448 K. The precipitate has a disk-shaped morphology parallel to the basal plane of the α-Mg matrix phase and increases hardness by aging in the temperature range of 448 to 573 K. The creep resistance of the die-cast material at 448 K was improved by a factor of 1.5 ∼ 2, by a peak-age heat treatment at 523 K for 1 hour. Improvement in strength is limited by the low volume fraction of the precipitates; however, the precipitates are effective obstacles against dislocations gliding on nonbasal planes during creep deformation.

Original languageEnglish (US)
Pages (from-to)696-702
Number of pages7
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume39 A
Issue number3
DOIs
StatePublished - Mar 2008
Externally publishedYes

ASJC Scopus subject areas

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

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