Dense nanocrystalline W alloys: Enhancement of hardness and thermal stability by Al addition

Francesco Torre, Teodor Huminiuc, Paolo Barra, Luciano Pilloni, Tomas Polcar, Antonio Rinaldi, Francesco Delogu, Roberto Orrù, Giacomo Cao, Antonio Mario Locci*

*Corresponding author for this work

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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.

Original languageEnglish
Article number106150
Number of pages12
JournalInternational Journal of Refractory Metals and Hard Materials
Volume112
Early online date13 Feb 2023
DOIs
Publication statusPublished - 1 Apr 2023

Keywords

  • Al alloys
  • Hardness
  • Nanocrystalline
  • Spark plasma sintering
  • W alloys

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