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Precipitation Strengthening of a Mg-Al-Ca–Based AXJ530 Die-cast Alloy
Ist Teil von
Metallurgical and materials transactions. A, Physical metallurgy and materials science, 2008-03, Vol.39 (3), p.696-702
Ort / Verlag
Boston: Springer US
Erscheinungsjahr
2008
Link zum Volltext
Quelle
SpringerNature Journals
Beschreibungen/Notizen
Precipitation of the Al
2
Ca 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 Al
2
Ca 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.