Abstract
The addition of Ca into Mg-(3–9)wt%Al alloys increased the hardness at the high temperatures up to 350°C. In particular, this was remarkable when the mass ratio of Ca to Al was higher than 0.8, probably owing to the precipitation of the Mg 2 Ca phase in the alloys. Such alloys with the Ca/Al mass ratio higher than 0.8 showed excellent heat resistance at a moderate temperature. Therefore, they were considered to be the new promising light-weight heat-resistant alloys for interior automotive applications.
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