Abstract
The Mg-6Zn-5Ca (wt%) alloy flakes were produced via atomization-twin roll quenching technology and analyzed by transmission electron microscopy (TEM)/energy-dispersive spectroscopy (EDS) (selected area diffraction pattern) and microhardness testing. The results showed that the alloy exhibited a relatively high hardness of 97.1 ± 5.3 Hv in the as-quenched state, and a significant age-hardening response and the maximum hardness was 120.8 ± 4.1 Hv after annealing at 200°C for 1 h, which mainly resulted from the precipitation of dispersive Ca2Mg6Zn3 phases that were distributed within the grains according to the transmission electron microscopy/selected area diffraction pattern. The stable Mg2Ca and a few Ca2Mg6Zn3 precipitates with relatively larger size were observed at the grain boundary, which were beneficial for a high hardness (87.9 ± 4.4 Hv) of the alloy experienced aging at 400°C.
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