NbMoTiVSi  refractory high entropy alloys strengthened by forming BCC phase and silicide eutectic structure

Xu, Qingyu; Chen, Dezhi; Tan, Chongyang; Xiao-qin, BI; Wang, Qi; Cui, Hongzhi; Zhang, Shuyan; Chen, Ruirun

doi:10.1016/j.jmst.2020.04.050

Cited by 41 publications

(7 citation statements)

References 34 publications

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“…As for NbMoTiVWSi x refractory high-entropy alloys in the present study, varies intermetallic silicides such as M 5 Si 3 , M 3 Si, M 3 Si 2 , M 2 Si, MSi 2 may be formed in the alloys according to the binary phase diagrams of Nb, Mo, Ti, V with Si. Actually, only M 5 Si 3 silicide phase form in the NbMoTiVWSi x alloys when the addition of silicon is higher than 0.05, and the same phenomenon was also observed in many other refractory high-entropy alloys, such as NbMoTiVSi x [24,27] ,…”

Section: Formation Of Silicide Phase In Alloyssupporting

confidence: 52%

“…Refractory high-entropy alloys, such as MoNbHfZrTi [8] , MoNbTaTiV [20] , NbTiVZr [21] , ZrNbTiVHf [22] , and HfNbTaTiZr [23] , were reported by many researchers. Some research results also show that addition of Si, Al or rare metals can decrease the density and improve the properties of refractory high-entropy alloys [13,[24][25][26][27][28][29][30][31] .…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al [28] reported that after adding Si, the phase constitutions of NbTaWMoSi x alloys change from single disordered BCC phase to multiphase of disordered BCC phase and silicide phase. Xu's study [24] shows that Si, addition into NbMoTiV can cause formation of BCC+M 5 Si 3 eutectic at inter-dendrite areas, and the yield strength of NbbMoTiVSi 0.4 is improved up to 2,093 MPa. Liu's study [25] shows that multi-component silicide (Hf, Nb, Ti) 5 Si 3 is generated after adding Si element into HfMo 0.5 NbTiV 0.5 , and exhibits a transition from hypoeutectic structure to eutectic structure and then to hypereutectic structure as Si content increases from 0 to 0.7.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure characteristics and mechanical properties of NbMoTiVWSix refractory high-entropy alloys

Wang

Chen

et al. 2022

China Foundry

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Refractory high-entropy alloys are considered as potential structural materials for elevated temperature applications. To obtain refractory high-entropy alloys with high strength, different amounts of Si were added into the NbMoTiVW refractory high-entropy alloys. The effects of Si on the phase constitution, microstructure characteristics and mechanical properties of NbMoTiVWSi x alloys were investigated. Results show that when the addition of Si is 0, 0.025 and 0.05 (molar ratio), the alloys are consisted of primary BCC and secondary BCC in the intergranular area. When the addition of Si is increased to 0.075 and 0.1, eutectic structure including silicide phase and secondary BCC phase is formed. The primary BCC phase shows dendritic morphology, and is refined by adding Si. The volume fraction of intergranular area is increased from 12.22% to 18.13% when the addition of Si increases from 0 to 0.1. The ultimate compressive strength of the NbMoTiVW alloy is improved from 2,242 MPa to 2,532 MPa. Its yield strength is also improved by the addition of Si, and the yield strength of NbMoTiVWSi 0.1 reaches maximum of 2,298 MPa. However, the fracture strain of the alloy is decreased from 15.31% to 12.02%. The fracture mechanism of the alloys is changed from mixed fracture of ductile and quasi-cleavage to cleavage fracture with increasing of Si. The strengthening of alloys is attributed to the refinement of primary BCC phase, volume fraction increment of secondary BCC phase, and formation of eutectic structure by addition of Si.

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Section: Formation Of Silicide Phase In Alloyssupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure characteristics and mechanical properties of NbMoTiVWSix refractory high-entropy alloys

Wang

Chen

et al. 2022

China Foundry

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“…The enhancement of T c and/or the improvement of J c are also expected for eutectic HEA superconductors. Recently, a eutectic phase has been reported [65] in Si-added bcc NbMoTiV. Since bcc HEA superconductors are extensively studied, the report of the eutectic phase in the bcc structure is highly encouraging.…”

Section: Eutectic Hea Superconductormentioning

confidence: 95%

Cutting Edge of High-Entropy Alloy Superconductors from the Perspective of Materials Research

Kitagawa

Hamamoto

Ishizu

2020

Metals

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High-entropy alloys (HEAs) are a new class of materials which are being energetically studied around the world. HEAs are characterized by a multicomponent alloy in which five or more elements randomly occupy a crystallographic site. The conventional HEA concept has developed into simple crystal structures such as face-centered-cubic (fcc), body-centered-cubic (bcc) and hexagonal-closed packing (hcp) structures. The highly atomic-disordered state produces many superior mechanical or thermal properties. Superconductivity has been one of the topics of focus in the field of HEAs since the discovery of the bcc HEA superconductor in 2014. A characteristic of superconductivity is robustness against atomic disorder or extremely high pressure. The materials research on HEA superconductors has just begun, and there are open possibilities for unexpectedly finding new phenomena. The present review updates the research status of HEA superconductors. We survey bcc and hcp HEA superconductors and discuss the simple material design. The concept of HEA is extended to materials possessing multiple crystallographic sites; thus, we also introduce multisite HEA superconductors with the CsCl-type, α-Mn-type, A15, NaCl-type, σ-phase and layered structures and discuss the materials research on multisite HEA superconductors. Finally, we present the new perspectives of eutectic HEA superconductors and gum metal HEA superconductors.

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“…The development of aerospace technology has put forward higher requirements for its high temperature hot end component materials, that is, moderate density, high temperature bearing capacity, excellent mechanical properties at room and high temperatures (toughness, ductility, strength, creep resistance), and good oxidation resistance at high temperature [1]. In recent years, refractory high entropy alloys (RHEAs) with equal or nearly equal atomic ratio, as a potential high temperature structural material, have attracted extensive attention from scholars at home and abroad because of their high temperature resistance and outstanding mechanical properties at room and high temperatures [2].…”

Section: Introductionmentioning

confidence: 99%

Zr alloying effects on the microstructure, compression performance and oxidation resistance of refractory high entropy alloys

Zhang

2022

Mater. Res. Express

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Three refractory high entropy alloys (RHEAs) with nominal compositions of Mo0.5NbHf0.25CrZrxTiAl (x = 0, 0.5, 1, mole ratio) were prepared by vacuum non-consumable arc melting technology. The influences of Zr addition on the microstructure, compressive performance and oxidation resistance at 1473 K of RHEAs were investigated and evaluated integrally. The results show that the three RHEAs are all composed of BCC1, BCC2 and Laves phases. With increasing the Zr content, the microstructure of RHEA has gradually become BCC1+BCC2 eutectics, and also the area fraction of BCC2 phase exhibits a rising trend. Both peak stresses are displayed at the strains of near 0.03 and 0.08 respectively in the compressive stress-strain curves of the three RHEAs. On the whole, the compressive yield strength of RHEA shows an increasing trend with Zr addition. The oxide scales of the three RHEAs all possess good adhesion and obviously layered structures. The different oxidation products are distributed in their oxide scales and internal oxidation zones. The oxidation resistance of RHEA is dramatically degraded due to the decreased compactness of the oxide scale with Zr addition.

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NbMoTiVSi refractory high entropy alloys strengthened by forming BCC phase and silicide eutectic structure

Cited by 41 publications

References 34 publications

Microstructure characteristics and mechanical properties of NbMoTiVWSix refractory high-entropy alloys

Microstructure characteristics and mechanical properties of NbMoTiVWSix refractory high-entropy alloys

Cutting Edge of High-Entropy Alloy Superconductors from the Perspective of Materials Research

Zr alloying effects on the microstructure, compression performance and oxidation resistance of refractory high entropy alloys

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