Hot deformation characteristics and dynamic recrystallization of the MoNbHfZrTi refractory high-entropy alloy

Guo, Ning; Wang, Li; Luo, Liangshun; Li, X.Z.; Chen, R.R.; Su, Yanqing; Guo, Jingjie; Fu, Hengzhi

doi:10.1016/j.msea.2015.10.113

Cited by 110 publications

(29 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1,2,5,15,16 Perhaps only the introduction of HEAs based on refractory metals, 29,[118][119][120]156,158,163,164,281,287,[291][292][293][294][295][296][297][298][299][300][301] instigated by Senkov, Miracle et al 27,28,302 have provided a notable step change in this respect. The alloying screening methods discussed above are not limited in terms of potential alloying elements, and are hence to be viewed favourably in this respect.…”

Section: Phase Prediction and Alloy Selection In Heasmentioning

confidence: 99%

High-entropy alloys: a critical assessment of their founding principles and future prospects

Pickering

Jones

2016

International Materials Reviews

697

299

View full text Add to dashboard Cite

High-entropy alloys (HEAs) are a relatively new class of materials that have gained considerable attention from the metallurgical research community over recent years. They are characterised by their unconventional compositions, in that they are not based around a single major component, but rather comprise multiple principal alloying elements. Four core effects have been proposed in HEAs: (1) the entropic stabilisation of solid solutions, (2) the severe distortion of their lattices, (3) sluggish diffusion kinetics and (4) that properties are derived from a cocktail effect. By assessing these claims on the basis of existing experimental evidence in the literature, as well as classical metallurgical understanding, it is concluded that the significance of these effects may not be as great as initially believed. The effect of entropic stabilisation does not appear to be overarching, insufficient evidence exists to establish the strain in the lattices of HEAs, and rapid precipitation observed in some HEAs suggests their diffusion kinetics are not necessarily anomalously slow in comparison to conventional alloys. The meaning and influence of the cocktail effect is also a matter for debate. Nevertheless, it is clear that HEAs represent a stimulating opportunity for the metallurgical research community. The complex nature of their compositions means that the discovery of alloys with unusual and attractive properties is inevitable. It is suggested that future activity regarding these alloys seeks to establish the nature of their physical metallurgy, and develop them for practical applications. Their use as structural materials is one of the most promising and exciting opportunities. To realise this ambition, methods to rapidly predict phase equilibria and select suitable HEA compositions are needed, and this constitutes a significant challenge. However, while this obstacle might be considerable, the rewards associated with its conquest are even more substantial. Similarly, the challenges associated with comprehending the behaviour of alloys with complex compositions are great, but the potential to enhance our fundamental metallurgical understanding is more remarkable. Consequently, HEAs represent one of the most stimulating and promising research fields in materials science at present.

show abstract

Section: Phase Prediction and Alloy Selection In Heasmentioning

confidence: 99%

High-entropy alloys: a critical assessment of their founding principles and future prospects

Pickering

Jones

2016

International Materials Reviews

697

299

View full text Add to dashboard Cite

show abstract

“…allows to fabricate coatings with very high hardness [9][10][11], good wear coefficient and resistance to wear, oxidation [12][13][14][15][16][17] and to corrosion [18,19] as well as with good electrical properties [20,21]. As it was reported in the previous papers [22,23], coatings on the (Ti,Zr)N base have high hardness 42-48 GPa, as well as resistance to oxidation under the influence of high temperatures 1170°С [24][25][26][27][28]. It is also known, that nanoscale multilayer coatings on the base of TiN, CrN, ZrN, and MoN have higher hardness in comparison with single-layer ones with the hardness equal to 24-38 GPa [25,[29][30][31].…”

Section: Introductionmentioning

confidence: 76%

Multilayered vacuum-arc nanocomposite TiN/ZrN coatings before and after annealing: Structure, properties, first-principles calculations

Pogrebnjak

Иващенко

Бондар

et al. 2017

Materials Characterization

View full text Add to dashboard Cite

A B S T R A C TNanoscale multilayered TiN/ZrN films were deposited using sequential vacuum-arc deposition of Ti and Zr targets in a nitrogen atmosphere. Studies of film's properties were carried out using various modern methods of analysis, such as XRD, STEM, HRTEM, SIMS combined with results of nanoindentation and tribological tests. To interpret the mechanical properties of the deposited multilayer films first-principles calculations of TiN(111), ZrN(111) structures and TiN(111)/ZrN(111) multilayer were carried out. To study the influence of thermal annealing, several samples were annealed in air at the temperature 700°C. All deposited samples were highly polycrystalline with quite large 20-25 nm crystals. The crystalline planes were very ordinated and demonstrated an excellent coordinated growth. The nanohardness and elastic modulus of non-annealed coatings reached 42 GPa and 348 GPa, respectively. Annealing in air at the temperature 700°C led to partial oxidation of the multilayered coatings, however hardness of the non-oxidized part of the coatings remained as high, as for initial coatings. All deposited coatings demonstrate good wear resistance.

show abstract

“…Discontinuous and continuous DRXs occurred simultaneously, with reduced effect of CDRX at high deformation temperature and low strain rate. [137] The partial substitution of Al with Hf in HfNbTaTiZr reduced the density by 9% and increased the room temperature yield strength by 98%, but the room temperature ductility reduced to 10% with no significant enhancement in the high-temperature strength. [211] The addition of Mo in place of Hf and reducing the Ta content to half have resulted in the increase of high-temperature strength from %90 to 250 MPa at 1200 C with a perceptible increase in RT ductility in AlMo 0.5 NbTa 0.5 TiZr HEA.…”

Section: à3mentioning

confidence: 98%

“…Refractory HEAs possess very high strength with strength retention at elevated temperatures. [74,[133][134][135][136][137][138] Consequently, in the present article, the microstructural evolutions after heat treatment and mechanical behaviors at high temperatures of Al x CrFeCoNi HEAs, CrMnFeCoNi HEA, and refractory HEAs are summarized. Concurrently, the high-temperature properties of other HEAs and other high-temperature properties such as high-temperature oxidation and hot corrosion resistance cannot be overlooked, and are eventually included at the end of this review article.…”

Section: Commonly Studied Alloysmentioning

confidence: 99%

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

2017

View full text Add to dashboard Cite

Multi-principal elemental alloys, commonly referred to as high-entropy alloys (HEAs), are a new class of emerging advanced materials with novel alloy design concept. Unlike the design of conventional alloys, which is based on one or at most two principal elements, the design of HEA is based on multi-principal elements in equal or near-equal atomic ratio. The advent of HEA has revived the alloy design perception and paved the way to produce an ample number of compositions with different combinations of promising properties for a variety of structural applications. Among the properties possessed by HEAs, sluggish diffusion and strength retention at elevated temperature have caught wide attention. The need to develop new materials for high-temperature applications with superior high-temperature properties over superalloys has been one of the prime concerns of the high-temperature materials research community. The current article shows that HEAs have the potential to replace Ni-base superalloys as the next generation hightemperature materials. This review focuses on the phase stability, microstructural stability, and high-temperature mechanical properties of HEAs. This article will be highly beneficial for materials science and engineering community whose interest is in the development and understanding of HEAs for high-temperature applications.

show abstract

Hot deformation characteristics and dynamic recrystallization of the MoNbHfZrTi refractory high-entropy alloy

Cited by 110 publications

References 37 publications

High-entropy alloys: a critical assessment of their founding principles and future prospects

High-entropy alloys: a critical assessment of their founding principles and future prospects

Multilayered vacuum-arc nanocomposite TiN/ZrN coatings before and after annealing: Structure, properties, first-principles calculations

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

Contact Info

Product

Resources

About