Powder Metallurgy Processing of a W x TaTiVCr High-Entropy Alloy and Its Derivative Alloys for Fusion Material Applications
Owais Ahmed Waseem,Ho Jin Ryu +1 more
TLDR
This study explored the potential of powder metallurgy processing for the fabrication of a high-entropy alloy and other derived compositions with enhanced hardness and strength through sintering of reduced-activation alloys for fusion plasma-facing materials.Abstract:
The WxTaTiVCr high-entropy alloy with 32at.% of tungsten (W) and its derivative alloys with 42 to 90at.% of W with in-situ TiC were prepared via the mixing of elemental W, Ta, Ti, V and Cr powders followed by spark plasma sintering for the development of reduced-activation alloys for fusion plasma-facing materials. Characterization of the sintered samples revealed a BCC lattice and a multi-phase structure. The selected-area diffraction patterns confirmed the formation of TiC in the high-entropy alloy and its derivative alloys. It revealed the development of C15 (cubic) Laves phases as well in alloys with 71 to 90at.% W. A mechanical examination of the samples revealed a more than twofold improvement in the hardness and strength due to solid-solution strengthening and dispersion strengthening. This study explored the potential of powder metallurgy processing for the fabrication of a high-entropy alloy and other derived compositions with enhanced hardness and strength.read more
Citations
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Journal ArticleDOI
Science and technology in high-entropy alloys
TL;DR: In this article, the authors review the recent development of high-entropy alloys and summarize their preparation methods, composition design, phase formation and microstructures, various properties, and modeling and simulation calculations.
Journal ArticleDOI
Outstanding radiation resistance of tungsten-based high-entropy alloys.
Osman El-Atwani,Nan Li,Mo Li,Arun Devaraj,Jon K. Baldwin,Matthew M. Schneider,Damian Sobieraj,Jan S. Wróbel,Duc Nguyen-Manh,Stuart A. Maloy,Enrique Martínez +10 more
TL;DR: A body-centered cubic W-based refractory high entropy alloy with outstanding radiation resistance has been developed, grown as thin films showing a bimodal grain size distribution in the nanocrystalline and ultrafine regimes and a unique 4-nm lamella-like structure revealed by atom probe tomography.
Journal ArticleDOI
High-entropy alloys fabricated via powder metallurgy. A critical review
TL;DR: High-entropy alloys (HEAs) have attracted a great deal of interest over the last 14 years and one reason for this level of interest is related to these alloys breaking the alloying principles.
Journal ArticleDOI
High-entropy alloys and metallic nanocomposites: Processing challenges, microstructure development and property enhancement
TL;DR: In this article, the effect of spark plasma sintering (SPS) on the microstructure and properties of high entropy alloys (HEAs) and metallic nanocomposites is analyzed.
Posted Content
Outstanding Radiation Resistance of Tungsten-based High Entropy Alloys
Osman El-Atwani,Nan Li,Mo Li,Arun Devaraj,Matthew M. Schneider,Damian Sobieraj,Jan S. Wróbel,Duc Nguyen-Manh,Stuart A. Maloy,Enrique Martínez +9 more
TL;DR: In this article, a novel W-based refractory high entropy alloy with outstanding radiation resistance has been developed, which was grown as thin films showing a bimodal grain size distribution in the nanocrystalline and ultrafine regimes and a unique 4 nm lamella-like structure revealed by APT.
References
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Journal ArticleDOI
Microstructures and properties of high-entropy alloys
TL;DR: The concept of high entropy introduces a new path of developing advanced materials with unique properties, which cannot be achieved by the conventional micro-alloying approach based on only one dominant element as mentioned in this paper.
Journal ArticleDOI
The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy
F. Otto,F. Otto,Antonín Dlouhý,Christoph Somsen,Hongbin Bei,Gunther Eggeler,Easo P. George,Easo P. George +7 more
TL;DR: In this article, an equiatomic CoCrFeMnNi high-entropy alloy, which crystallizes in the face-centered cubic (fcc) crystal structure, was produced by arc melting and drop casting.
Journal ArticleDOI
Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys
TL;DR: In this paper, two refractory high entropy alloys with compositions near Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20, were produced by vacuum arc-melting.
Journal ArticleDOI
Refractory high-entropy alloys
TL;DR: In this article, two refractory high-entropy alloys with nearequiatomic concentrations, WNB-Mo-Ta and WBMCV, were produced by vacuum arc melting and the lattice parameters were determined with high-energy X-ray diffraction using a scattering vector length range from 0.7 to 20A−1.
Journal ArticleDOI
A precipitation-hardened high-entropy alloy with outstanding tensile properties
Junyang He,Hao Wang,He Huang,Xiandong Xu,Mingwei Chen,Yuan Wu,Xiongjun Liu,T.G. Nieh,Ke An,Zhaoping Lu +9 more
TL;DR: In this paper, the authors demonstrate the possibility to precipitate a coherent reinforcing phase in a fcc-FeCoNiCr HEA matrix using minor additions of Ti and Al, and demonstrate that extraordinary balanced tensile properties at room temperature were achieved, which was due to a well combination of various hardening mechanisms, particularly precipitation hardening.
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