Abstract
Microstructure, mechanical properties and fracture behaviors of sand-cast Mg-4Y-3Nd-1Gd-0.2Zn-0.5Zr (wt%) alloy in different thermal conditions were investigated. The as-cast alloy was comprised of α-Mg matrix, Mg24Y5, Mg41Nd5 and β1 phases. After solution treatment at 525°C for 6h, the eutectics dissolved into α-Mg matrix, leading to a huge improvement of plasticity. Alloys peak-aged at 200°C and 225°C exhibit high strength due to fine dense β″ and β′ precipitates. Aged at 250°C for 10h, the precipitates in the alloy are coarse sparse coupled β1/β′ phases. A desirable combination of strength and ductility was obtained with 198MPa in yield strength, 276MPa in ultimate tensile strength and 7.6% in elongation when over-aged at 250°C for 10h. Alloys under different thermal conditions show different fracture behaviors, which are closely linked to the structures of both inner grains and grain boundaries.
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