Effects of Mo, Nb, Ta, Ti, and Zr on Mechanical Properties of Equiatomic Hf-Mo-Nb-Ta-Ti-Zr Alloys

Tseng, Ko-Kai; Juan, Chien-Chang; Tso, Shuen; Chen, Hsuan-Chu; Tsai, Che-Wei; Yeh, Jien‐Wei

doi:10.3390/e21010015

Cited by 101 publications

(43 citation statements)

References 42 publications

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“…This approach is used in Refs. [8,12,20,29,[54][55][56]. In the second approach, the non-homogeneities of the lattice are considered within the core of dislocations and the solid solution strengthening mechanism is explained by enhanced Peierls-Nabarro stress ( PN ) or friction stress ( f ) of the lattice.…”

Section: Alloy Designmentioning

confidence: 99%

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%

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 CALPHAD method uses a variety of models to explain how the free-energy functions of the different phases are temperature, pressure, and concentration dependence. Three contributions to Gibbs energy from concentration dependency have proved useful for multi-component systems, it is given by G W110 equation ( 33) corresponds to G ex in equation (30). Sundman and Agren 112 introduced this description model at first, which was later modified by Andersson et al 113 Since the Gibbs energy indicates a minimum for a given temperature, pressure, and composition at thermodynamic equilibrium.…”

Section: Prediction Of Solid Solution Phase Via Calphad Approachmentioning

confidence: 99%

“…As a result of their versatility, workability, and environmental safety, HEAs have a wide range of potential applications as structural and functional materials such as thermoelectric materials magnetic materials superconducting. [23][24][25] Contor et al 7 investigated equiatomic multicomponent alloy composition FeCoNiMnCr which exhibited a single FCC solid solution phase while Yeh et al [26][27][28][29][30] additionally explored the different combinations of numerous elements such as Ti, V, Al, Mo, Ta, Zr and Nb which exhibited better mechanical properties compared to the conventional alloy systems. HEAs usually form BCC, FCC solid solution structure, and occasionally HCP structure.…”

Section: Introductionmentioning

confidence: 99%

A review on phase prediction in high entropy alloys

Soni

Sanyal

Rao

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The formation of single phase solid solution in High Entropy Alloys (HEAs) is essential for the properties of the alloys therefore, numerous approach were proposed by many researchers to predict the stability of single phase solid solution in High Entropy Alloy. The present review examines some of the recent developments while using computational intelligence techniques such as parametric approach, CALPHAD, Machine Learning etc. for prediction of various phase formation in multicomponent high entropy alloys. A detail study of this data-driven approaches pertaining to the understanding of structural and phase formation behaviour of a new class of compositionally complex alloys is done in the present investigation. The advantages and drawbacks of the various computational are also discussed. Finally, this review aims at understanding several computational modeling tools complying the thermodynamic criteria for phase formation of novel HEAs which could possibly deliver superior mechanical properties keeping an aim at advanced engineering applications.

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“…Zýka et al [ 44 ] presented investigations of the room-temperature tensile mechanical properties of selected three- and four-element medium entropy alloys derived from the Hf-Nb-Ta-Ti-Zr system, and they found that it is the five-element HEA alloy that exhibits the best combination of strength and elongation. Tseng et al [ 45 ] aimed to reveal the effects of Mo, Nb, Ta, Ti, and Zr on mechanical properties of equiatomic Hf-Mo-Nb-Ta-Ti-Zr alloys. Another VCrFeTa x W x HEA, which has great high-temperature properties and excellent heat-softening resistance, was studied and recommended by Zhang et al [ 46 ].…”

Section: Mechanical Behaviorsmentioning

confidence: 99%