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Article: Hot Tearing of Ternary Mg-Al-Ca Alloy Castings

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Metallurgical and Materials Transactions
Article date:
December 1, 2006
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Ternary Mg-Al-Ca alloys are the base of a few new creep-resistant, lightweight Mg alloys for automobiles. Hot tearing in Mg-xAl-yCa alloys was studied, including Mg-4Al-0.5Ca, Mg-4Al-1.5Ca, Mg-4Al-2.5Ca, Mg-4Al-3.5Ca, Mg-5Al-2.5Ca, and Mg-6Al-2.5Ca, by constrained rod casting (CRC) in a steel mold-with a movable pouring cup to keep solidification therein from interfering with the rising tension in the rods. The hot tearing susceptibility, based on measured crack widths and crack locations, decreased significantly with increasing Ca content (y) but did not change much with the Al content (x). An instrumented CRC with a steel mold was developed to detect the onset of hot tearing by monitoring ...

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