Precipitation Strengthening of a Mg-Al-Ca Based AXJ530 Die-cast Alloy

Details Precipitation Strengthening of a Mg-Al-Ca Based AXJ530 Die-cast Alloy Precipitation Strengthening of a Mg-Al-Ca Based AXJ530 Die-cast Alloy

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mmta...39..696s&link_type=abstract

Metallurgical and Materials Transactions A, Volume 39, Issue 3, pp.696-702

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Scientific paper

Precipitation of the Al2Ca phase in the α-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.

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