Elaboration and Characterization of WMoTaNb High Entropy Alloy Prepared by Powder Metallurgy Processes

Abstract

This work concerns the sintering of tungsten-based (i.e WMoTaNb) high entropy alloy (HEA) powders using the spark plasma sintering (SPS) technique and their mechanical properties. The synthesis was performed by a self-propagating high-temperature synthesis (SHS) type reaction in which the mixture of metallic oxides (WO3, MoO3 …) is reduced by magnesium. For this, a specific reactor has been developed. Different conditions including the addition of a moderator were tested. These powders are then densified by SPS technology which allows for keeping the initial microstructure of the powder. The optimization of sintering conditions was performed with the objective to control simultaneously the chemical composition, the grain growth and the densification stages.

Powder Metallurgy: Materials and Processing

“…The SI consists of 16 papers (published between 2022 and 2023): a review article [ 1 ], a viewpoint paper [ 2 ], a communication [ 3 ], and thirteen research articles [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. The papers reflect the current trends in the field: the search for new compositions (not investigated previously) of materials and the development of new processing approaches enabling better control and flexibility of the materials’ microstructures, shapes, and architectures.…”

“…The research papers report recent findings in metallic [ 4 , 5 , 6 , 7 , 8 , 9 ], ceramic [ 10 , 11 , 12 ], polymer [ 3 ], and composite materials [ 3 , 13 , 14 , 15 , 16 ].…”

“…The preparation of powders of metallic alloys has been addressed by Petrov et al [ 7 ] and Tikhov et al [ 9 ]. The fabrication of high-entropy alloys via powder metallurgy methods has been presented by Moser et al [ 5 ] and Batraev et al [ 6 ]. The problem of producing parts from 17-4 PH stainless steel by pressing and sintering has been addressed by Kazior [ 4 ].…”

“…The problem of producing parts from 17-4 PH stainless steel by pressing and sintering has been addressed by Kazior [ 4 ]. Noteworthy is the increasing attention to the possibilities of field-assisted sintering for the production of metallic alloys and composites, as seen in articles [ 5 , 8 , 14 ].…”