Designing nanoparticles-strengthened high-entropy alloys with simultaneously enhanced strength-ductility synergy at both room and elevated temperatures

Hou, Jinxiong; Liu, Shaofei; Cao, Boxuan; Luan, Junhua; Zhao, Yunsong; Chen, Z.; Zhang, Q.; Liu, X.J.; Liu, Chang; Kai, Ji Jung; Yang, Tao

doi:10.1016/j.actamat.2022.118216

Cited by 79 publications

(3 citation statements)

References 71 publications

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“…When tested at high temperatures, oxygen-embrittling elements from the environment can rapidly permeate along grain boundaries, reducing the cohesiveness of grain boundaries and leading to the easy initiation of intergranular cracks. This dynamic oxygen embrittlement behavior has been reported in several other superalloys and intermetal complexes at a similar temperature range, which greatly limits their practical applications [ 55 ]. However, only a small number of impurities formed due to oxidation were found upon the fracture, which were not observed in either SEM or TEM observations.…”

Section: Discussionmentioning

confidence: 60%

“…In this study, it was obtained that the fracture plasticity of the alloy diminishes as the temperature rises (except at 673 K) (See Figure 4 b). This trend is at odds with the experience with alloys in general, and this phenomenon may be the result of the following factors: First, the effect of high-temperature oxidation [ 55 ]. Despite the multiple treatments, the high-temperature oxidation during the stretching process cannot be avoided.…”

Section: Discussionmentioning

confidence: 99%

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High-Temperature Mechanical Properties of NbTaHfTiZrV0.5 Refractory High-Entropy Alloys

Liu

Shi

Zhang

et al. 2023

Entropy

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The NbTaHfTiZrV0.5 is a refractory multi-principal-element alloy with high strength and good ductility at room temperature. It is important for possible high-temperature applications to investigate the deformation mechanism of the NbTaHfTiZrV0.5 alloy at different temperatures using tensile tests. In this investigation, the tensile tests were conducted at room temperature to 1273 K on sheet materials fabricated by cold rolling combined with annealing treatments. At 473 K, the NbTaHfTiZrV0.5 alloy exhibited a high tensile ductility (12%). At a testing temperature range of 673~873 K, the ductility was reduced, but the yield strength remained above 800 MPa, which is rare in most other alloys. The TEM investigations revealed that a dislocation slip controlled the plastic deformation, and the degree of deformation was closely related to the dislocation density. The true stress–strain curves of the alloy under different deformation conditions were obtained by tensile deformation at different deformation temperatures (673~873 K) and strain rates (0.001~0.0005 s−1). Experimental results were utilized to construct the parameters of a constitutive model based on a traditional mathematical model to predict the flow behavior at high temperatures. The excellent high-temperature mechanical properties of the NbTaHfTiZrV0.5 alloy will enable it to be used in several engineering applications.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

High-Temperature Mechanical Properties of NbTaHfTiZrV0.5 Refractory High-Entropy Alloys

Liu

Shi

Zhang

et al. 2023

Entropy

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“…recognized that coherent L1 2 -type precipitate-strengthened HEAs are some of the most promising candidates for high-temperature structural applications due to their exceptional thermal and mechanical properties at a wide range of temperatures [20,[70][71][72] . Unfortunately, like many high-strength metallic structural materials, such L1 2 -strengthened HEAs also usually exhibit temperature-dependent premature tensile failure.…”

Section: Ite Mechanisms and Strategies For Hea Systemsmentioning

confidence: 99%

Environmental embrittlement behavior of high-entropy alloys

2022

Microstructures

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High entropy alloys (HEAs), as a new class of structural materials, have attracted extensive interest from numerous metallurgical scientists and engineers. Benefiting from their unique microstructural features and outstanding mechanical performance, HEAs have shown significant potential for applications in many engineering fields, even under extreme conditions. In particular, when exposed to hydrogen and/or intermediate-temperature environments, these HEAs inevitably suffer from severe environmental embrittlement (EE) issues, e.g., hydrogen embrittlement (HE) and intermediate-temperature embrittlement (ITE), resulting in serious premature intergranular failure. In this work, we critically review the state-of-the-art advances of EE in previously reported HEA systems. Particular focus is given to novel strategies to enhance the resistance to EE in different HEAs. Two critical embrittlement phenomena, namely, HE and ITE, are highlighted separately. Finally, we provide perspectives on future research directions and opportunities for EE-resistant HEAs.

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A Novel Precipitation-Hardened Medium-Entropy Alloy with Excellent Tensile Properties

Desetti,

Nagini,

Babu

et al. 2024

Metall Mater Trans A

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Designing nanoparticles-strengthened high-entropy alloys with simultaneously enhanced strength-ductility synergy at both room and elevated temperatures

Cited by 79 publications

References 71 publications

High-Temperature Mechanical Properties of NbTaHfTiZrV0.5 Refractory High-Entropy Alloys

High-Temperature Mechanical Properties of NbTaHfTiZrV0.5 Refractory High-Entropy Alloys

Environmental embrittlement behavior of high-entropy alloys

A Novel Precipitation-Hardened Medium-Entropy Alloy with Excellent Tensile Properties

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