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Erschienen in:
01.11.2012 | Symposium: Approaches for Investigating Phase Transformations at the Atomic Scale
Microalloying Effect on the Precipitation Processes of Mg-Ca Alloys
Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 11/2012
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Abstract
The Mg-Ca binary alloys in the Mg-Mg2Ca two-phase region show little precipitation hardening by aging. However, the Mg-Ca alloys microalloyed with Al and Zn result in notable age hardening because of the formation of metastable, internally ordered, plate-like Guinier–Preston (GP) zones on the basal plane. To enhance the age-hardening response, we explored microalloying elements that can alter the habit plane from basal to prismatic. We found that an indium addition causes the homogeneous precipitation of thin plates on prismatic planes, resulting in a pronounced age-hardening response. Based on transmission electron microscopy and atom probe analysis results, we discuss the structure of the GP zones and the possible origin of the habit plane alternation.