Ductile W0.4MoNbxTaTi refractory high-entropy alloys with excellent elevated temperature strength

Wei, Wuran; Wang, Tao; Wang, Qianqian; Wu, Meng; Nie, Yunpeng; Peng, Jun

doi:10.1016/j.matlet.2021.129753

Cited by 29 publications

(7 citation statements)

References 16 publications

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“…10c), which are detrimental to deformation stability. Crack propagation occurred in hot deformed W 0.4 MoNb x TaTi RHEA at temperatures of 800, 1000, and 1100 °C [76]. At 800 °C, the Nb 1.3 alloy in Figure 10d showed severe cracks at grain boundaries.…”

Section: Unsafe Deformation Behavior In Hot Deformed Rheamentioning

confidence: 96%

“…At 800 and 1000 °C, a decrease in the yield stress was seen and related to the energy provided by the high temperature. After reaching the yield point, Wei et al [76] indicated a distinct steady-state flow stages which were seen on the true stress-strain curves. During hot deformation of mechanical alloyed and spark plasma sintered MoNbTaTiV RHEA, Liu et al [77] observed that flow stresses at temperatures (1100 and 1200 °C) exhibit similar trends.…”

Section: Trend Of Scientific Publication On Hot Deformation Of Rheas ...mentioning

confidence: 98%

“…In 2021, Wei et al [76] observed work hardening after yielding in W 0.4 MoNb x TaTi (x = 1.1, 1.3, and 1.5) RHEA hot deformed at strain rates of 0.001 s À1 and temperatures of 800, 1000, and 1100 °C. At 800 and 1000 °C, a decrease in the yield stress was seen and related to the energy provided by the high temperature.…”

Section: Trend Of Scientific Publication On Hot Deformation Of Rheas ...mentioning

confidence: 99%

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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: Unsafe Deformation Behavior In Hot Deformed Rheamentioning

confidence: 96%

Section: Trend Of Scientific Publication On Hot Deformation Of Rheas ...mentioning

confidence: 98%

Section: Trend Of Scientific Publication On Hot Deformation Of Rheas ...mentioning

confidence: 99%

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

et al. 2023

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“…, [38], [47], [49]- [51] compared to that of Inconel 718 and Hastelloy S [52] ..................................... Figure 2-3: Fracture strain at room temperature of various RHEAs [33], [38], [47], [49]- [51] compared to that of Inconel 718 and Hastelloy S [52]…”

Section: List Of Figuresmentioning

confidence: 99%

“…Currently some reported RHEAs are capable of achieving high strength at elevated temperatures and good room temperature ductility, such as the W0.4MoNb1.3TaTi alloy developed in [47] which achieved a σ0. [33], [38], [47], [49]- [51] compared to that of Inconel 718 and Hastelloy S [52]…”

Section: High Temperature Strengthmentioning

confidence: 99%

Microstructural Characterization and Phase Prediction of High Entropy Alloys using Empirical and Machine Learning Based Methodologies

Mohammadi

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Alloys containing four or more principal alloying elements in near equal atomic percentage, so called High Entropy Alloys (HEA), break down the solvent-solute relationship generally seen in traditional alloys. This creates a vast and unpredictable design space, unfeasible to explore purely experimentally or through computational simulations. This thesis aims to present a newly developed machine learning based phase prediction methodology for HEA alloys, the empirical design and characterization of a Zr-containing HEA system, and a performance comparison of the developed methodology and established empirical method at predicting the impact of Zr on the phase composition with experimental results as a reference. Findings show that the developed phase prediction methodology, which leverages a convolutional neural network, could predict the formation of a secondary BCC solid solution phase within the high entropy alloys caused by the addition Zr and intermetallic compound formation, while the empirical parameters failed to do so.

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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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Ductile W0.4MoNbxTaTi refractory high-entropy alloys with excellent elevated temperature strength

Cited by 29 publications

References 16 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

Microstructural Characterization and Phase Prediction of High Entropy Alloys using Empirical and Machine Learning Based Methodologies

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

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