Precipitation strengthening of a Mg-Al-Ca based die-cast alloy with Al 2Ca phase

Akane Suzuki, Nicholas D. Saddock, Jessica R. Terbush, Bob R. Powell, J. Wayne Jones, Tresa M. Pollock

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Precipitation of the Al2Ca (C15) phase and the effect of these precipitates on creep strength were investigated in a die-cast AXJ530 (Mg-5Al-3Ca-0.15Sr, wt%) alloy. The as-die-cast material consists of the a-Mg matrix phase and a eutectic structure, and does not exhibit intra-granular precipitates. However, subsequent isothermal aging treatments result in the formation of finely dispersed Al2Ca precipitates. The Al 2Ca precipitates have a disc-shaped morphology with the close-packed plane parallel to the basal plane of the matrix phase ((0001) hcp//{111}c15). Aging treatments were conducted in a temperature range between 448 and 673 K, and a time-temperature-transformation (TTT) diagram for the precipitation was determined. An increase in hardness due to the precipitation was observed by aging below 573 K. The specimens aged at 523 K for 3.6 ks exhibit improved creep resistance at 448 K compared to the as-die-cast material, and the creep rate in the secondary stage is reduced to 1/2-2/3 of that of the as-die-cast materials.

Original languageEnglish (US)
Title of host publicationMagnesium Technology 2007 - Proceedings of Symposium Sponsored by the Magnesium Committee of the Light Metals Division of TMS
Pages375-380
Number of pages6
StatePublished - 2007
Externally publishedYes
EventTMS 2007 Annual Meeting and Exhibition - Orlando, FL, United States
Duration: Feb 25 2007Mar 1 2007

Publication series

NameMagnesium Technology
ISSN (Print)1545-4150

Conference

ConferenceTMS 2007 Annual Meeting and Exhibition
Country/TerritoryUnited States
CityOrlando, FL
Period2/25/073/1/07

Keywords

  • Creep
  • Precipitation hardening
  • TTT diagram

ASJC Scopus subject areas

  • General Engineering

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