Abstract
Hardness and wear resistance of Mg–B4C nanocomposites produced using dynamic and quasi-static compaction method were investigated. Micron-sized Mg particles were mixed with 1.5%, 3%, 5% and 10% volume fractions of nano-sized B4C. High rate compactions were conducted at 723 °K and at strain rates of and using Split Hopkinson Bar (SHB) and Drop Hammer (DH), respectively and low rate were conducted at strain rate of The results revealed that the hardness was increased by 25% at high rate loading compactions with respect to the low rate compactions. The results also indicated that the hardness of Mg-10 vol%B4C nanocomposites fabricated by SHB was around 50% higher than that of the as-received Mg. The same trend was observed in wear resistance of the high and low rate compacted specimens so that the wear resistance of Mg-10 vol%B4C nanocomposites fabricated by SHB was around 70% higher than that of the as-received Mg. Finally, the friction coefficient of the samples was 43% lower than the dynamically produced samples.
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