Hexagonal Closed-Packed Precipitation Enhancement in a NbTiHfZr Refractory High-Entropy Alloy

Ma, Yueli; Wu, Shiwei; Jia, Yandong; Hu, Pengfei; Bu, Yeqiang; Chen, Xiangru; Wang, Gang; Liu, Jiabin; Wang, Hongtao; Zhai, Qijie

doi:10.3390/met9050485

Cited by 31 publications

(8 citation statements)

References 33 publications

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“…With changing the alloy √ Table 2 Values of coefficients obtained after fitting the proposed polynomial to the experimental dataset in Table 1 Coefficient The hardest alloy in the Hf-Mo-Nb-Ta-Ti-V-Zr system within the investigated composition range is predicted to be Hf 15 Mo 20 Nb 5 Ta 15 Ti 5 V 20 Zr 20 with the yield stress of 1792 MPa. According to the tensile-ductility data in previous research works [34,[41][42][43][44][45][46][47][48][49][50][51][52], alloys with tensile yield stresses less than 1200 MPa could have tensile ductility higher than 5% (Fig. 8).…”

Section: Alloy Designmentioning

confidence: 99%

“…The hardest alloy in Hf-Mo-Nb-Ta-Ti-V-Zr system within the investigated composition range is predicted to be Hf 15 Mo 20 Nb 5 Ta 15 Ti 5 V 20 Zr 20 with the yield stress of 1792 MPa. According to the tensile-ductility data in previous research works [34,[41][42][43][44][45][46][47][48][49][50][51][52], alloys with tensile yield stresses less than 1200 MPa could have tensile ductility higher than 5% (Figure 8). Therefore, the developed polynomial is used for finding alloys in Hf-Mo-Nb-Ta-Ti-V-Zr system with compressive yield stresses less than 1150 MPa.…”

Section: Figure 6 the Relation Between Valence Electron Concentration...mentioning

confidence: 99%

“…Tensile ductility versus tensile yield stress for single-phase bcc RHEs[34,[41][42][43][44][45][46][47][48][49][50][51][52] …”

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confidence: 99%

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New approach to model the yield strength of body-centered cubic solid solution refractory high-entropy alloys

Shafiei

2020

Tungsten

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A data fitting approach is used in the present work for modeling the yield strength of single-phase body-centered cubic (bcc) refractory high-entropy alloys (RHEAs) in the Al-Hf-Nb-Mo-Ta-Ti-V-Zr system. It is suggested that a polynomial equation could be used for modeling the strength of solid solution alloys where an experimental dataset containing more than 80 data is used for fitting and obtaining optimized polynomial coefficients. The comparison results show that the predictions are in good agreement with experimental data indicating that the proposed polynomial could be used for modeling the strength of RHEAs. To show how the developed polynomial can be applied in designing of RHEAs, the alloy system Hf-Mo-Nb-Ta-Ti-V-Zr is selected as an example and the strength of designed RHEAs within this system is investigated by the developed polynomial. The results show that the strength of alloys within this system increases by increasing the amount of Mo and Zr, while the strength of alloys decreases by increasing the amount of Ti. Moreover, the results indicate that the strength of alloys increases with increasing the values of parameters atomic size difference (ASD) and valence electron concentration (VEC). The developed polynomial can be considered as a straightforward method for assessing the strength of solid solution RHEAs, although it does not explain the mechanisms involved in the strengthening of alloys.

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Section: Alloy Designmentioning

confidence: 99%

Section: Figure 6 the Relation Between Valence Electron Concentration...mentioning

confidence: 99%

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New approach to model the yield strength of body-centered cubic solid solution refractory high-entropy alloys

Shafiei

2020

Tungsten

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“…The different mechanisms of microstructure evolution during heat treatments reported in literature are as follows: recovery 126,137 , precipitation 138,139 , recrystallization 140 -142 , grain growth [143][144][145] , and annealing twins 146,147 , etc. The mechanism in play triggering the microstructural change for HEA is dictated by annealing temperature 148 .…”

Section: Annealing Temperaturementioning

confidence: 99%

Strength–Ductility Synergy in High Entropy Alloys by Tuning the Thermo-Mechanical Process Parameters: A Comprehensive Review

2022

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IntroductionHigh Entropy Alloys (HEA) are the class of alloys having minimum of five principal elements with a concentration of constituent elements between 5 and 35 at% [1][2][3][4] . The microstructure, properties, and performance of HEA are driven by four core effects, i.e., high configurational entropy 1,5 , lattice distortion 3 , sluggish diffusion 6 , and cocktail effect 7 . Owing to these effects, HEA exhibit excellent tensile ductility, fracture toughness, corrosion resistance, and many other important properties of relevance [8][9][10][11][12][13] . The combination of desirable property attributes in HEAs makes these materials a perfect candidate for numerous applications, like in gas storage, in ion irradiation plants, and for biomedical implants [13][14][15] . The lower yield

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“…An NbTiHfZr high-entropy alloy has a BCC crystal structure with a small amount of the HCP phase. After cold working and annealing, the HCP nanoprecipitate volume fraction increased, thus improving strength and ductility [49]. A study was performed on an MoNbRe 0.5 W (TaC) x composite refractory high-entropy alloy with varying TaC contents.…”

Section: Strengthening Mechanismmentioning

confidence: 99%

A Review of the Latest Developments in the Field of Refractory High-Entropy Alloys

et al. 2021

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This review paper provides insight into current developments in refractory high-entropy alloys (RHEAs) based on previous and currently available literature. High-temperature strength, high-temperature oxidation resistance, and corrosion resistance properties make RHEAs unique and stand out from other materials. RHEAs mainly contain refractory elements like W, Ta, Mo, Zr, Hf, V, and Nb (each in the 5–35 at% range), and some low melting elements like Al and Cr at less than 5 at%, which were already developed and in use for the past two decades. These alloys show promise in replacing Ni-based superalloys. In this paper, various manufacturing processes like casting, powder metallurgy, metal forming, thin-film, and coating, as well as the effect of different alloying elements on the microstructure, phase formation, mechanical properties and strengthening mechanism, oxidation resistance, and corrosion resistance, of RHEAs are reviewed.

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Hexagonal Closed-Packed Precipitation Enhancement in a NbTiHfZr Refractory High-Entropy Alloy

Cited by 31 publications

References 33 publications

New approach to model the yield strength of body-centered cubic solid solution refractory high-entropy alloys

New approach to model the yield strength of body-centered cubic solid solution refractory high-entropy alloys

Strength–Ductility Synergy in High Entropy Alloys by Tuning the Thermo-Mechanical Process Parameters: A Comprehensive Review

A Review of the Latest Developments in the Field of Refractory High-Entropy Alloys

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