Strengthening mechanisms in CrMoNbTiW refractory high entropy alloy

Raman, Lavanya; Anupam, Ameey; Karthick, G.; Berndt, C. C.; Ang, Andrew Siao Ming; Murty, S.V.S. Narayana; Fabijanic, Daniel; Murty, B.S.; Kottada, Ravi Sankar

doi:10.1016/j.msea.2021.141503

Cited by 43 publications

(2 citation statements)

References 44 publications

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“…Refractory high entropy alloys (RHEAs) which have high-melting-point refractory elements, were introduced in 2010 as potential candidates for high temperature functional materials due to their high hardness, wear resistance, and high temperature strength above 1100 °C when compared with Inconel 718 and Haynes 230 [16,17]. These characteristics are the result of increased melting temperature and solid solution strengthening [13,18]. The main potential applications of refractory high entropy alloys include tribology and thin film [19,20], hydrogen storage [21][22][23][24], nuclear materials [25][26][27], surface and coatings technology [28][29][30], and hard particles for wear resistance [31].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review on the deformation behavior of refractory high entropy alloys at elevated temperatures

et al. 2023

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Thermo-mechanical processing of refractory high entropy alloys (RHEAs) at high temperatures is very important. It is an effective method of modifying the microstructure, properties, and shaping into final components after casting. Using the Scopus database, 57 articles relating to the hot deformation of refractory high entropy alloys were extracted from 2011 to 2022. Despite the limited number of articles on hot deformation of RHEAs, it is important to find out if the dominant softening mechanisms reported in other metallic alloys are evident. This is the main impetus for this study since the hot deformation behavior has not been comprehensively studied. All the probable mechanisms influencing deformation in metallic alloys, such as work hardening, dynamic recrystallization, and dynamic recovery, have also been observed in RHEAs. The bulging phenomenon, serrated grain boundaries, and necklace-like structures reported in metallic alloys have also been detected in hot deformed RHEAs. Unsafe deformation behavior such as cracks that have been reported in metallic alloys, have also been observed in RHEAs. This review has provided a comprehensive study on the hot working processes of RHEAs and highlighted critical gaps for future research direction with some suggested limitations.

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Section: Introductionmentioning

confidence: 99%

A comprehensive review on the deformation behavior of refractory high entropy alloys at elevated temperatures

et al. 2023

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“…Recently, studies on W-containing high-entropy alloys suggest that addition of W can improve the mechanical properties by solid solution strengthening effect [14,32] . It also shows very good compatibility with element Nb, Mo, Ti, etc.…”

Section: Introductionmentioning

confidence: 99%

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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Flow Behavior and Microstructure of Hot‐Worked TiNbTaVW Refractory High‐Entropy Alloy

Bamisaye,

Maledi,

Merwe

et al. 2024

Adv Eng Mater

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The high‐temperature deformation behavior of an equiatomic TiNbTaVW refractory high entropy alloy (RHEA) was studied at temperatures of 950, 1000, and 1050 °C and a strain rate of 10−3 s−1. The flow stress, high‐temperature strength, and softening mechanisms were analyzed and compared with the IN718 nickel‐based superalloy. The results indicate that the flow stress of both TiNbTaVW and IN718 is sensitive to deformation temperature, with high temperatures resulting in reduced flow stress. Globular grains and elongated grains were observed at 950 and 1000 °C for TiNbTaVW, signifying both dynamic recovery and dynamic globularization as the softening mechanisms. Globular grains were only observed at 1050 °C for TiNbTaVW, signifying dynamic globularization as the softening mechanism. The TiNbTaVW RHEA has a higher temperature strength of 910, 870, and 658 MPa compared to the IN718 alloy with 72, 87, and 61 MPa at 950–1000 °C/10−3 s−1. By demonstrating comparable or superior performance in specific aspects, RHEAs can be considered in the near future for potential applications traditionally dominated by nickel‐based superalloys.

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Strengthening mechanisms in CrMoNbTiW refractory high entropy alloy

Cited by 43 publications

References 44 publications

A comprehensive review on the deformation behavior of refractory high entropy alloys at elevated temperatures

A comprehensive review on the deformation behavior of refractory high entropy alloys at elevated temperatures

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

Flow Behavior and Microstructure of Hot‐Worked TiNbTaVW Refractory High‐Entropy Alloy

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