Abstract
We have investigated the age-hardening responses and corresponding microstructures of Mg–0.3Ca–xZn (x=0.0, 0.1, 0.3, 0.6, 1.0, 1.6at.%) alloys by hardness test, transmission electron microscopy (TEM), and high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). Zn additions up to x=0.6 lead to enhanced age-hardening responses with the highest peak hardness of HV=69 for x=0.6. Further addition of Zn degraded the age-hardening responses. HAADF-STEM images revealed that the finely dispersed monolayer G.P. zones with internal ordered structure are the major contributor to the age-hardening. Excess addition of Zn resulted in the formation of Ca2Mg6Zn3 precipitates suppressing the formation of the ordered G.P. zones.
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