Mechanical Properties and Microstructure of a NiCrFeCoMn High-Entropy Alloy Deformed at High Strain Rates

Wang, Bingfeng; Yao, Xianrui; Wang, Chu; Zhang, Xiaoyong; Huang, Xiaoxia

doi:10.3390/e20110892

Cited by 25 publications

(8 citation statements)

References 34 publications

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“…This supports our conclusion that the uranium f-states are delocalized and thus do not significantly impact the electrical transport behavior. At lower temperatures, S(T) exhibits a weak peak around 50 K, which we propose is due to phonon drag effect, as is seen in other HEAs due to plastic deformation at high strain rates [35][36][37] . The thermal conductivity (Fig.…”

Section: Structural and Chemical Characterization Of [supporting

confidence: 52%

Superconductivity in a uranium containing high entropy alloy

Nelson

Chemey

Hertz

et al. 2020

Sci Rep

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High entropy alloys (HEA) are an unusual class of materials where mixtures of elements are stochastically arrayed on a simple crystalline lattice. These systems exhibit remarkable functionality, often along several distinct axes: e.g., the examples [TaNb]1-x(TiZrHf)x are high strength and damage resistant refractory metals that also exhibit superconductivity with large upper critical fields. Here we report the discovery of an f-electron containing HEA, [TaNb]0.31(TiUHf)0.69, which is the first to include an actinide ion. Similar to the Zr-analogue, this material crystallizes in a body-centered cubic lattice with the lattice constant a = 3.41(1) Å and exhibits phonon mediated superconductivity with a transition temperatures Tc ≈ 3.2 K and upper critical fields Hc2 ≈ 6.4 T. These results expand this class of materials to include actinide elements, shows that superconductivity is robust in this sub-group, and opens the path towards leveraging HEAs as functional waste forms for a variety of radioisotopes.

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Section: Structural and Chemical Characterization Of [supporting

confidence: 52%

Superconductivity in a uranium containing high entropy alloy

Nelson

Chemey

Hertz

et al. 2020

Sci Rep

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“…In terms of the materials, the most used HEA is the CoCrFeNiMn one. This is probably related to the fact that this alloy system is the most studied within the field of HEAs [22,25,34,[70][71][72]. For this reason, in this section of the paper (2.1.1), we first address the current status on fusion-welding of the CoCrFeNiMn HEA system, and the following one (2.1.2) focuses on the remaining materials that were already welded.…”

Section: Fusion-based Welding Of Heasmentioning

confidence: 99%

A Short Review on Welding and Joining of High Entropy Alloys

Lopes

Oliveira

2020

Metals

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High entropy alloys are one of the most exciting developments conceived in the materials science field in the last years. These novel advanced engineering alloys exhibit a unique set of properties, which include, among others, good mechanical performance under severe conditions in a wide temperature range and high microstructural stability over long time periods. Owing to the remarkable properties of these alloys, they can become expedite solutions for multiple structural and functional applications. Nevertheless, like any other key engineering alloy, their capacity to be welded, and thus become a permanent feature of a component or structure, is a fundamental issue that needs to be addressed to further expand these alloys’ potential applications. In fact, welding of high entropy alloys has attracted some interest recently. Therefore, it is important to compile the available knowledge on the current state of the art on this topic in order to establish a starting point for the further development of these alloys. In this article, an effort is made to acquire a comprehensive knowledge on the overall progress on welding of different high entropy alloy systems through a systematic review of both fusion-based and solid-state welding techniques. From the current literature review, it can be perceived that welding of high entropy alloys is currently gaining more interest. Several high entropy alloy systems have already been successfully welded. However, most research works focus on the well-known CoCrFeMnNi. For this specific system, both fusion and solid-state welding have been used, with no significant degradation of the joints’ mechanical properties. Among the different welding techniques already employed, laser welding is predominant, potentially due to the small size of its heat source. Overall, welding of high entropy alloys is still in its infancy, though good perspectives are foreseen for the use of welded joints based on these materials in structural applications.

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“…The alloy exhibited a stress-dependent transition from a low-stress region to a high-stress region, which was characterized by the dynamic recrystallization and the grain-boundary precipitation. This alloy, deformed at high strain rates (900 to 4600 s −1 ), was investigated by Wang et al [ 15 ]. The yield strength was sensitive to the change of high strain rates, and serration behaviors were also observed on the flow stress curves, which could be predicted by the Zerilli–Armstrong constitutive equation.…”

Section: Mechanical Behaviorsmentioning

confidence: 99%