Development of high-performance quaternary LPSO Mg–Y–Zn–Al alloys by Disintegrated Melt Deposition technique
作者： Tan XingHe , Winston Chee Keat How , Jimmy Chan Kwok Weng , Richard Kwok Wai Onn , Manoj Gupta
DOI: 10.1016/J.MATDES.2015.06.041
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摘要: Abstract In the present study, new quaternary MgY 1.65 Zn 0.74 Al 0.53 and 3.72 1.96 0.45 alloys (wt.%) were synthesized employing Disintegrated Melt Deposition (DMD) casting technique followed by hot extrusion. Microstructural characterization revealed presence of 14H long-period stacking ordered structure (LPSO) Mg 4 Y 2 ZnAl 3 phases aligned along direction extrusion in both alloys. Refined grains (⩽5 μm) due to effect dynamic recrystallization (DRX) also observed co-exist with larger worked (⩾20 μm) extruded microstructures. Compared monolithic Mg, significant increase microhardness (∼67–88%), tensile yield strength (∼245–290%) ultimate (∼113–144%) Mg–Y–Zn–Al Despite materials, failure strains comparable Mg. Ignition temperatures found outperform commercially available AZ31, AZ80 WE43 (high-temperature) alloys, highest ignition temperature 770 °C was achieved alloy.
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