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Aluminium matrix tungsten aluminide and tungsten reinforced composites by solid-state diffusion mechanism
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4888-6237
2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, no 1, 12391Article in journal (Refereed) Published
Abstract [en]

In-situ processing of tungsten aluminide and tungsten reinforced aluminium matrix composites from elemental tungsten (W) and aluminium (Al) was investigated by thermal analysis and pulsed current processing (PCP). The formation mechanism of tungsten aluminides in 80 at.% Al-20 at.% W system was controlled by atomic diffusion. The particle size of W and Al in the starting powder mixture regulated the phase formation and microstructure. PCP of micron sized elemental Al and W resulted in formation of particulate reinforcements, W, Al4W and Al12W, dispersed in Al matrix. W particles were surrounded by a ~3 μm thick dual-layer structure of Al12W and Al4W. The hardness of Al matrix, containing Al12W reinforcements, was increased by 50% compared to pure Al, from 0.3 GPa to 0.45 GPa and W reinforcements showed a hardness of 4.35 GPa. On PCP of 80 at.% Al-20 at.% W mixture with particle size of W and Al ~70 nm, resulted in formation of Al4W as major phase along with small fractions of Al5W and unreacted W phase. This suggested strongly that the particle size of the starting elemental Al and W could be the controlling parameter in processing and tailoring of phase evolution, microstructure of particulate reinforced Al matrix composite.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017. Vol. 7, no 1, 12391
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-65925DOI: 10.1038/s41598-017-12302-wISI: 000412000100006PubMedID: 28959027Scopus ID: 2-s2.0-85030115396OAI: oai:DiVA.org:ltu-65925DiVA: diva2:1146484
Note

Validerad;2017;Nivå 2;2017-10-03 (andbra)

Available from: 2017-10-03 Created: 2017-10-03 Last updated: 2017-11-24Bibliographically approved

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