Microstructure and properties of Al0.5NbTi3VxZr2 refractory high entropy alloys combined with high strength and ductility

Wang, Tiantian; Jiang, Wentao; Wang, Xiaohong; Jiang, Bo; Rong, Chuanbing; Wang, Ye; Yang, Jieren; Zhu, Dongdong

doi:10.1016/j.jmrt.2023.03.103

Cited by 24 publications

(4 citation statements)

References 41 publications

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“…These features collectively contribute to their excellent mechanical properties. − Furthermore, the chemical inhomogeneity in HEAs can elicit unique mechanical responses, such as superelongation and a delayed inverse Hall-Petch effect . Refractory high entropy alloys (RHEAs) are a kind of alloy that can maintain excellent mechanical properties at high temperatures. − Taking the NbMoTaW and NbMoTaWV RHEAs produced by Senkov et al via vacuum arc melting as an example, they are composed of refractory metal elements (i.e., Nb, Mo, Ta, W, and V) with equal atomic concentration, which belong to the VB and VIB groups in the periodic table, with similar atomic size and high melting points. It has been found that they can maintain outstanding mechanical, chemical, and physical properties over a wide range of temperatures, such as high yield strength, , high-temperature oxidation resistance, corrosion resistance, and radiation resistance, etc.…”

Section: Introductionmentioning

confidence: 99%

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Pan,

Fu,

Duan

et al. 2024

ACS Appl. Nano Mater.

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In recent years, considerable research efforts have been directed toward addressing the room-temperature brittleness of BCC NbMoTaW refractory high entropy alloys (RHEAs). However, there has been limited investigation of the plastic deformation mechanism at room temperature. In this work, we utilized molecular dynamics simulation to investigate the mechanical behavior and atomistic plastic deformation mechanism of BCC NbMoTaW RHEA nanowires under uniaxial compression/tension. It showed that, under tension, the primary deformation mechanism of the nanowires involves the nucleation and growth of twins from the surface, while under compression, the deformation is predominantly attributed to dislocation slip and twinning, with the twins formed by the dissociation of screw dislocations, differing from the twin nucleation and growth under tension. Furthermore, the tension−compression asymmetry of the nanowires was discussed in detail, considering the atomic arrangement and energy barrier. This work contributes to a deeper understanding of the relationship between the deformation mechanism and mechanical response of NbMoTaW RHEAs, which is significant for their rational design and aerospace applications.

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Section: Introductionmentioning

confidence: 99%

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Pan,

Fu,

Duan

et al. 2024

ACS Appl. Nano Mater.

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“…Design and development of the non-equiatomic HEAs with excellent strength and toughness has been the focus of many studies in recent years. One approach to solving these issues is the adding or variation of alloying elements (e.g., titanium (Ti), aluminum (Al), silicon (Si), and copper (Cu)) to equiatomic or near-equiatomic HEAs, which can effectively improve combination properties, while maintaining simple solid solution phases [13][14][15][16][17][18][19]. Hu et al [15] used the powder metallurgy technique to study microstructure and corrosion properties of AlxCuFeNiCoCr (x = 0.5, 1.0, 1.5, 2.0) high-entropy alloys, and the results confirmed that the microstructure and corrosion properties of these alloys are closely related to its Al content.…”

Section: Introductionmentioning

confidence: 99%

“…Chuang et al [18] showed that the Al x Co 1.5 CrFeNi 1.5 Tiy HEAs with a high Ti/Al ratio showed higher wear resistance compared with the conventional wear-resistant steels. In addition, several studies have demonstrated that the excellent properties are not unique to the equiatomic composition, and there is a high chance that even better properties are obtained at non-equiatomic compositions, such as Al 0.5 NbTi 3 V x Zr 2 , Fe 3 Cr 2 Al 2 CuNi 4 Si 5 , and Ni 6 Cr 4 WFe 9 Ti [5,6,[19][20][21][22][23][24][25]. Although many HEAs have been developed, theoretical predictions and simulations of HEAs are still lacking due to their chemical complexity.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Non-Equiatomic Ni10Cr6WFe9TiAlx High-Entropy Alloys Combined with High Strength and Toughness

Yang

He²,

Li³

et al. 2023

Metals

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High-entropy alloys (HEAs) with excellent mechanical properties have broad application scope and application prospects. However, it is difficult to obtain the optimized element composition, based on the traditional equiatomic or near-equiatomic statistical analysis of the phase selection rules. The non-equiatomic HEAs have abundant constituents combination by optimizing the type and content of elements. In this study, Ni10Cr6WFe9TiAlx (x = 0, 1.0 and 1.5, at.%) HEAs were prepared by vacuum arc melting. The effect of Al content x on microstructure and mechanical properties of HEAs was systematically studied. The results show that the HEAs are composed mainly of face-centered cubic (FCC) with hexagonal Al2W phase. The increase of Al content promotes the formation of the hexagonal Al2W phase. When the Al mole content is 1.0, the Ni10Cr6WFe9TiAl HEA material has achieved superior mechanical properties. The alloy exhibited a high ultimate tensile strength of 741 MPa and a large total elongation of 46%. The improvement in the mechanical properties of the Ni10Cr6WFe9TiAl HEA is mainly attributed to the precipitation strengthening of the high-density Al2W phase. This work provides a reference for the future design of Al2W precipitation-strengthened non-equiatomic HEAs with ideal properties.

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“…[5] Furthermore, the BCC HEA is considered a promising option for aero engines, nuclear reactors, and gas turbines in the future, due to the high melting points employed metals and hysteretic diffusion. [6][7][8][9] The main challenge that limits the application of metallic materials at high temperatures is creep. The creep break is always sudden, and it can be incredibly deadly for hightemperature components, making it even worse.…”

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confidence: 99%

The Studying of high-temperature deformation mechanism in a new light-weight high-strength HEAs from the view of internal fricition

wang,

Chen,

et al. 2024

Preprint

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The BCC high entropy alloy (HEA) has always been considered a promising material for high temperatures, and a novel BCC HEA was developed in this study. The precipitation of a second HCP phase in the grain during the warming process is responsible for the alloy's characteristic high temperature strength. The dynamic modulus of the alloy increased continuously above 550°C, while its internal friction peak exhibited the typical signature of a grain boundary peak. Annealing at 800°C for 3 hours has the potential to slightly enhance ductility and reduce room temperature compression strength to a limited extent. It is believed that the initial decrease and subsequent increase in dynamic modulus can be attributed to the combination of second phase precipitation and thermal relaxation. The TEM and fracture SEM analysis of heat-treated specimens revealed that the modification of high temperature hardening and ductility was attributed to the second phase, which impedes the dislocation's movement.

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Microstructure and properties of Al0.5NbTi3VxZr2 refractory high entropy alloys combined with high strength and ductility

Cited by 24 publications

References 41 publications

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Microstructure and Properties of Non-Equiatomic Ni10Cr6WFe9TiAlx High-Entropy Alloys Combined with High Strength and Toughness

The Studying of high-temperature deformation mechanism in a new light-weight high-strength HEAs from the view of internal fricition

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