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

doi:10.1016/j.ijrmhm.2023.106150

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

School of Mathematics & Physics

Research output: Contribution to journal › Article › peer-review

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Abstract

Nanocrystalline W_100-xAl_x (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 language	English
Article number	106150
Number of pages	12
Journal	International Journal of Refractory Metals and Hard Materials
Volume	112
Early online date	13 Feb 2023
DOIs	https://doi.org/10.1016/j.ijrmhm.2023.106150
Publication status	Published - 1 Apr 2023

Keywords

Al alloys
Hardness
Nanocrystalline
Spark plasma sintering
W alloys

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10.1016/j.ijrmhm.2023.106150

Dense nanocrystalline W alloysFinal published version, 17.8 MBLicence: CC BY

Cite this

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title = "Dense nanocrystalline W alloys: Enhancement of hardness and thermal stability by Al addition",

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.",

keywords = "Al alloys, Hardness, Nanocrystalline, Spark plasma sintering, W alloys",

author = "Francesco Torre and Teodor Huminiuc and Paolo Barra and Luciano Pilloni and Tomas Polcar and Antonio Rinaldi and Francesco Delogu and Roberto Orr{\`u} and Giacomo Cao and Locci, {Antonio Mario}",

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doi = "10.1016/j.ijrmhm.2023.106150",

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T1 - Dense nanocrystalline W alloys

T2 - Enhancement of hardness and thermal stability by Al addition

AU - Torre, Francesco

AU - Huminiuc, Teodor

AU - Barra, Paolo

AU - Pilloni, Luciano

AU - Polcar, Tomas

AU - Rinaldi, Antonio

AU - Delogu, Francesco

AU - Orrù, Roberto

AU - Cao, Giacomo

AU - Locci, Antonio Mario

PY - 2023/4/1

Y1 - 2023/4/1

N2 - 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.

AB - 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.

KW - Al alloys

KW - Hardness

KW - Nanocrystalline

KW - Spark plasma sintering

KW - W alloys

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