Abstract
The ultrafine-grained Mg–3Al–Zn alloys were successfully fabricated by the method of mechanical milling, cold press consolidation and warm extrusion. The effect of extrusion temperature on the microstructure and compression properties of the as-extruded samples has been investigated. The results indicate that with the increase of extrusion temperature from 423K to 473K, full dynamic recrystallization (DRX) behavior replaces partial DRX, while the average grain size increases from 246nm to 499nm. The uniformly dispersioned nano-MgO particles derived from mechanical milling could significantly enhance the compressive properties of as-extruded samples. The yield strength, ultimate compression strength, and fracture strain of the as-extruded alloy with an average grain size of 246nm are, respectively, 508.0MPa, 512.8MPa and 9.2%. The high strength of the alloy is principally ascribed to ultra-fine grained structure and nano-MgO dispersion strengthening, and the contribution ratios are 23.58% and 62.36%, respectively.
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