Effect of Ti additions on mechanical properties of NbMoTaW and VNbMoTaW refractory high entropy alloys

Han, Zhiqiang; Chen, N.; Zhao, Shaofan; Fan, Liu; Yang, Guannan; Shao, Yang; Yao, K.

doi:10.1016/j.intermet.2017.01.007

Cited by 334 publications

(98 citation statements)

References 43 publications

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“…The relative density is calculated to be 96.75%. Furthermore, the microhardness of bulk NbMoTaWVTi HEA is measured to be 786 HV, which is larger than 510 HV of the as-cast NbMoTaWVTi HEA [6]. Figure 4a shows the compressive engineering stress–strain curve of the sintered HEA specimen.…”

Section: Resultsmentioning

confidence: 99%

“…The mechanical properties are compared with other reported refractory HEAs [5,6,20,21,22,23], as shown in Figure 4b. It is apparent that the sintered NbMoTaWVTi HEA possesses the highest yield strength and fair fracture strain.…”

Section: Resultsmentioning

confidence: 99%

“…Han et al have successfully synthesized TiNbMoTaW and TiVNbMoTaW refractory HEAs. It is found that the addition of Ti with the largest atomic size significantly improves the mechanical properties of HEAs at room and elevated temperature [6,7]. …”

Section: Introductionmentioning

confidence: 99%

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Enhanced Strength of a Mechanical Alloyed NbMoTaWVTi Refractory High Entropy Alloy

Long

Zhang

et al. 2018

Materials

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A NbMoTaWVTi refractory high entropy alloy (HEA) has been successfully synthesized by mechanical alloying (MA) and spark plasma sintering (SPS). The microstructure and mechanical properties of this alloy are investigated. It is observed that only two types of body-centered cubic (BCC) solid solutions are formed in the powders after ball milling for 40 h. However, a new face-centered cubic (FCC) precipitated phase is observed in the BCC matrix of bulk material consolidated by SPS. The FCC precipitated phase is identified as TiO, due to the introduction of O during the preparing process of HEA. The compressive yield strength, fracture strength, and total fracture strain of the consolidated bulk HEA are 2709 MPa, 3115 MPa, and 11.4%, respectively. The excellent mechanical properties can be attributed to solid solution strengthening and grain boundary strengthening of the fine-grained BCC matrix, as well as the precipitation strengthening owing to the formation of TiO particles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Enhanced Strength of a Mechanical Alloyed NbMoTaWVTi Refractory High Entropy Alloy

Long

Zhang

et al. 2018

Materials

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“…Recently, high-entropy alloys (HEAs) have attracted considerable attention because of their extraordinary properties [1][2][3][4][5][6][7][8][9][10], and numerous HEAs have been reported with various compositions [1][2][3][4][5][6][7][8][9][10]. Three major HEAs are CoCrFeMnNi alloy which has potential applications in cryogenic environments [5,6], refractory VNbMoTaW alloy for high-temperature structural applications [7,8], and AlCoCrFeNi alloy which maintains high strength up to intermediate temperatures [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Three major HEAs are CoCrFeMnNi alloy which has potential applications in cryogenic environments [5,6], refractory VNbMoTaW alloy for high-temperature structural applications [7,8], and AlCoCrFeNi alloy which maintains high strength up to intermediate temperatures [9,10]. AlCoCrFeNi HEA is relatively lightweight and has excellent specific strength around intermediate temperatures.…”

Section: Introductionmentioning

confidence: 99%

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Kang

Lim

Won

et al. 2018

Entropy

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Abstract:In this study, new high-entropy alloys (HEAs), which contain lightweight elements, namely Al and Ti, have been designed for intermediate temperature applications. Cr, Mo, and V were selected as the elements for the Al-Ti-containing HEAs by elemental screening using their binary phase diagrams. AlCrMoTi and AlCrMoTiV HEAs are confirmed as solid solutions with minor ordered B2 phases and have superb specific hardness when compared to that of commercial alloys. The present work demonstrates the desirable possibility for substitution of traditional materials that are applied at intermediate temperature to Al-Ti-containing lightweight HEAs.

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Room‐Temperature Mechanical Properties of V₂₀Nb₂₀Mo₂₀Ta₂₀W₂₀ High‐Entropy Alloy

Wang

et al. 2018

Adv Eng Mater

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Refractory high‐entropy alloys (HEAs) have shown promising high temperature strengths, while their mechanical behaviors at room temperature are rarely reported. In this work, the room‐temperature mechanical properties of V20Nb20Mo20Ta20W20 refractory HEA under various different loading modes including tension, compression, bending, shear loading, and microhardness are investigated. The results show that this alloy exhibits very high compressive strength but quite low strengths under tension, bending, and shear loading, similar to the conventional brittle materials. However, pronounced plasticity and slip bands are observed in compression samples, and no indentation cracking is observed in low‐load microhardness tests, which indicate the potential ability of plastic deformation in this refractory HEA. The present work suggests that the microstructure or composition of this HEA should be carefully tailored before its practical usage to suppress its large tendency for cracking and eventually improve its ductility and strength under tension.

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Effect of Ti additions on mechanical properties of NbMoTaW and VNbMoTaW refractory high entropy alloys

Cited by 334 publications

References 43 publications

Enhanced Strength of a Mechanical Alloyed NbMoTaWVTi Refractory High Entropy Alloy

Enhanced Strength of a Mechanical Alloyed NbMoTaWVTi Refractory High Entropy Alloy

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Room‐Temperature Mechanical Properties of V₂₀Nb₂₀Mo₂₀Ta₂₀W₂₀ High‐Entropy Alloy

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Effect of Ti additions on mechanical properties of NbMoTaW and VNbMoTaW refractory high entropy alloys

Cited by 334 publications

References 43 publications

Enhanced Strength of a Mechanical Alloyed NbMoTaWVTi Refractory High Entropy Alloy

Enhanced Strength of a Mechanical Alloyed NbMoTaWVTi Refractory High Entropy Alloy

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Room‐Temperature Mechanical Properties of V20Nb20Mo20Ta20W20 High‐Entropy Alloy

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Room‐Temperature Mechanical Properties of V₂₀Nb₂₀Mo₂₀Ta₂₀W₂₀ High‐Entropy Alloy