Abstract
Nanocrystalline W100-xAlx (x up to 20 at.%) powders obtained by mechanical alloying have been consolidated by spark plasma sintering (SPS). Alloying W with Al significantly improves the sinterability, allowing the fabrication of dense samples. The consolidation process keeps the nanocrystalline microstructure substantially unaffected, which contributes to the hardness of the final W-Al alloys. The room-temperature nano- and micro-hardness of dense W80Al20 alloy sintered at 1100 °C are as high as 18 and 14 GPa, respectively. These values are significantly higher than those previously reported for pure coarse- or submicron-grained W and may be ultimately ascribed to the grain boundary segregation of Al.
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