One-step consolidation and precipitation hardening of an ultrafine-grained Al-Zn-Mg alloy powder by Spark Plasma Sintering
Abstract In the present work, ultrafine-grained Al-Zn-Mg alloy produced by high energy ball milling and Spark Plasma Sintering was synthesized. The Hall-Petch strengthening due to grain refinement (about 150nm) is preserved and the Orowan's effect attributed to the presence of the hardening phase η ’ is obtained in a single-step during the sintering. Maximum compression stresses as high as 736MPa and 830MPa were reached in quasistatic and dynamic conditions respectively. Hardness was increased from 124HV5 for a consolidated coarse grained material to 196HV for a consolidated ultrafine-grained (UFG) material. The mechanical properties obtained in this study were all superior to the ones of the reference AA7020-T651.
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