Abstract
The age-hardening response of two cast Mg-Zn-RE alloys has been investigated and compared with that of a binary Mg-Zn alloy. The microstructures of the aged specimens were examined by analytical electron microscopy. Formation of a fine dispersion of rodlikeβ ′1 precipitates is the main cause for age hardening, while extensive precipitation of disc-shapedβ ′2 coincides with the onset of overaging. Rare earth additions retard the formation ofβ ′2 precipitates and thus postpone overaging. Four different orientation relationships betweenβ ′2 precipitates and matrix were found and explained in terms of the near-CSL model.
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Wei, L.Y., Dunlop, G.L. & Westengen, H. Precipitation Hardening of Mg-Zn and Mg-Zn-RE alloys. Metall Mater Trans A 26, 1705–1716 (1995). https://doi.org/10.1007/BF02670757
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DOI: https://doi.org/10.1007/BF02670757