Journal ArticleDOI
Mechanical properties of low-density, refractory multi-principal element alloys of the Cr–Nb–Ti–V–Zr system
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In this article, the authors investigated the room temperature and elevated temperature mechanical properties of four multi-principal element alloys, NbTiVZr (NbTiZr), NbTIZr, CrNbV2Zr and Cr NbVZR, and showed high yield strength but low ductility (6% and 3% compression strain).Abstract:
Room temperature and elevated temperature mechanical properties of four multi-principal element alloys, NbTiVZr, NbTiV 2 Zr, CrNbTiZr and CrNbTiVZr, are reported. The alloys were prepared by vacuum arc melting followed by hot isostatic pressing and homogenization. Disordered BCC solid solution phases are the major phases in these alloys. The Cr-containing alloys additionally contain an ordered FCC Laves phase. The NbTiVZr and NbTiV 2 Zr alloys showed good compressive ductility at all studied temperatures while the Cr-containing alloys showed brittle-to-ductile transition occurring somewhere between 298 and 873 K. Strong work hardening was observed in the NbTiVZr and NbTiV 2 Zr alloys during deformation at room temperature. The alloys had yield strengths of 1105 MPa and 918 MPa, respectively, and their strength continuously increased, exceeding 2000 MPa after ∼40% compression strain. The CrNbTiZr and CrNbTiVZr alloys showed high yield strength (1260 MPa and 1298 MPa, respectively) but low ductility (6% and 3% compression strain) at room temperature. Strain softening and steady state flow were typical during compression deformation of these alloys at temperatures above 873 K. In these conditions, the alloys survived 50% compression strain without fracture and their yield strength continuously decreased with an increase in temperature. During deformation at 1273 K, the NbTiVZr, NbTiV 2 Zr, CrNbTIZr, and CrNbTiVZr alloys showed yield strengths of 58 MPa, 72 MPa, 115 MPa and 259 MPa, respectively.read more
Citations
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A critical review of high entropy alloys and related concepts
Daniel B. Miracle,Oleg N. Senkov +1 more
TL;DR: High entropy alloys (HEAs) are barely 12 years old as discussed by the authors, and the field has stimulated new ideas and inspired the exploration of the vast composition space offered by multi-principal element alloys.
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High-Entropy Alloys: A Critical Review
Ming-Hung Tsai,Jien-Wei Yeh +1 more
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Development and exploration of refractory high entropy alloys—A review
TL;DR: In this article, the authors reviewed open literature publications on refractory high entropy alloys (RHEAs) and refractor complex concentrated alloys(RCCAs) in the period from 2010 to the end of January 2018.
Journal ArticleDOI
Exploration and Development of High Entropy Alloys for Structural Applications
Daniel B. Miracle,J. D. Miller,Oleg N. Senkov,Christopher Woodward,Michael D. Uchic,Jaimie Tiley +5 more
TL;DR: It is shown that intermetallic phases are consistent with HEA definitions, and the strategy developed here includes both single-phase, solid solution HEAs and HEAs with intentional addition of a 2nd phase for particulate hardening.
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High-Entropy Alloys Fundamentals and Applications
TL;DR: In the last century, significant evolution and progress have led to the invention of special alloys, such as stainless steels, high speed steels and superalloys.
References
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Journal ArticleDOI
Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes
Jien-Wei Yeh,Swe-Kai Chen,Su-Jien Lin,Jon-Yiew Gan,Tsung-Shune Chin,Tsung-Shune Chin,Tao-Tsung Shun,Chun-Huei Tsau,Shou-Yi Chang +8 more
TL;DR: A new approach for the design of alloys is presented in this paper, where high-entropy alloys with multi-principal elements were synthesized using well-developed processing technologies.
Journal ArticleDOI
Solid‐Solution Phase Formation Rules for Multi‐component Alloys
TL;DR: In this article, the factors of the atomic size difference Delta and the enthalpy of mixing ΔH mιx of the multi-component alloys were summarized from the literatures.
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
Microstructure and Room Temperature Properties of a High-Entropy TaNbHfZrTi Alloy (Postprint)
TL;DR: In this article, a refractory alloy, Ta20Nb20Hf20Zr20Ti20, was produced by vacuum arc-melting and the as-solidified alloy had a dendritic structure, which was not affected by hot isostatic pressing.