Investigation on the Microstructure Characterization and Aging Response of Rapidly Solidified Mg-6wt%Zn-5wt%Ca Alloy Produced by Atomization-Twin Roll Quenching Technology

摘要

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.View full textDownload full textKeywordsAge hardening behavior, Hardness, Magnesium alloy, Microstructure, Rapid solidificationRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/10426914.2011.557129