Microstructure and Mechanical Performance of Brand‐New Al0.3CrFe1.5MnNi0.5 High‐Entropy Alloys

Tang, Wei-Yeh; Chuang, Ming-Hao; Chen, Hsuan-You

doi:10.1002/adem.200900135

Cited by 22 publications

(5 citation statements)

References 20 publications

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“…It has been suggested that specific HEAs demonstrate some exceptional mechanical properties in comparison to conventional alloys, which might make them attractive in structural applications. Examples include the impressive fatigue resistance of Al CrFeCoNiCu, 67,68,174 the wear resistance of Al CrFe MnNi , 92,245 Al CrFeCoNiCu, 246 Al Ti CrFeCo Ni 106 and derivatives, 61–63 as well as the exceptional toughness and strength of CrFeMnCoNi at cryogenic temperatures, 36,40,41 which will be examined in particular detail below. It is not appropriate to talk about the properties of HEAs in general terms, since their different compositions can deliver very different properties, arguably to an greater extent than that which can be expected across alloys systems like steels.…”

Section: A Route For Alloy Developmentmentioning

confidence: 99%

High-entropy alloys: a critical assessment of their founding principles and future prospects

Pickering

Jones

2016

International Materials Reviews

707

299

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High-entropy alloys (HEAs) are a relatively new class of materials that have gained considerable attention from the metallurgical research community over recent years. They are characterised by their unconventional compositions, in that they are not based around a single major component, but rather comprise multiple principal alloying elements. Four core effects have been proposed in HEAs: (1) the entropic stabilisation of solid solutions, (2) the severe distortion of their lattices, (3) sluggish diffusion kinetics and (4) that properties are derived from a cocktail effect. By assessing these claims on the basis of existing experimental evidence in the literature, as well as classical metallurgical understanding, it is concluded that the significance of these effects may not be as great as initially believed. The effect of entropic stabilisation does not appear to be overarching, insufficient evidence exists to establish the strain in the lattices of HEAs, and rapid precipitation observed in some HEAs suggests their diffusion kinetics are not necessarily anomalously slow in comparison to conventional alloys. The meaning and influence of the cocktail effect is also a matter for debate. Nevertheless, it is clear that HEAs represent a stimulating opportunity for the metallurgical research community. The complex nature of their compositions means that the discovery of alloys with unusual and attractive properties is inevitable. It is suggested that future activity regarding these alloys seeks to establish the nature of their physical metallurgy, and develop them for practical applications. Their use as structural materials is one of the most promising and exciting opportunities. To realise this ambition, methods to rapidly predict phase equilibria and select suitable HEA compositions are needed, and this constitutes a significant challenge. However, while this obstacle might be considerable, the rewards associated with its conquest are even more substantial. Similarly, the challenges associated with comprehending the behaviour of alloys with complex compositions are great, but the potential to enhance our fundamental metallurgical understanding is more remarkable. Consequently, HEAs represent one of the most stimulating and promising research fields in materials science at present.

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Section: A Route For Alloy Developmentmentioning

confidence: 99%

High-entropy alloys: a critical assessment of their founding principles and future prospects

Pickering

Jones

2016

International Materials Reviews

707

299

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“…Welding qualities must be satisfied for the application of HEAs. The following aspects of weldability of HEA are to be investigated: high lattice distortion, possible welding cracks, transformation of solid solution phase, and production of intermetallic compounds [12][13][14]. Owing to high lattice distortion, the previous studies on welding HEAs focused on low heat input welding.…”

Section: Introductionmentioning

confidence: 99%

Effect of post weld heat treatment on weldability of high entropy alloy welds

Nam

Park

Kim

et al. 2018

Science and Technology of Welding and Joining

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The effect of post weld heat treatment (PWHT) temperature on laser beam welds in high-entropy alloys (HEAs) using a cold-rolled cantor system (CoCrFeMnNi) was investigated. Laser welding of low heat input was applied to reduce thermal distortion. The cold-rolled HEA welds indicated larger grain size and inferior tensile/hardness properties as compared to the base metal (BM). By applying PWHT, the welds showed superior hardness to the BM with no variation in the facecentred cubic phase and a decrease in the size and fraction of CrMn oxide inclusions. As the PWHT temperature increased (800-1000°C), the variation in the grain size decreased between the weld metal and heat-affected zone, thus resulting in approximately the same tensile strength and elongation of the transverse welds as compared to the BM.

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“…In a recent report, similar peaks have been reported by Pauzi et al [11] for Al 0.5 FeCrNiMnZr 0.3 alloy. According to Tang et al [12] who has prepared Al 0.3 CrFe 1.5 MnNi 0.5 HEA, identified the precipitates in the dendrite matrix as Cr 5 Fe 6 Mn 8 intermetallic compound. Unfortunately, due to low intensities of diffraction peaks from these unidentified phases, precipitate identification could not be carried out from the XRD patterns in this study.…”

Section: Methodsmentioning

confidence: 99%

Effect of Ta Addition on Microstructure and Hardness of FeCrNiMnCoTax and Al0.5FeCrNiMnCoTax High-Entropy Alloys

Pauzi

Harun

Talari

2016

MSF

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Phase formation, microstructure, and hardness properties of FeCrNiMnCoTax and Al0.5 FeCrNiMnCoTax high-entropy alloys (HEA) have been investigated and reported. In this study, FeCrNiMnCoTax and Al0.5FeCrNiMnCoTax high-entropy alloys (HEA) were synthesized using arc-melting technique in argon (Ar) atmosphere from high purity elements (x in molar ratio, x=0.2, x=0.4 and x=0.6). Ingots from arc-melting were homogenized for 24h at 900°C in Ar atmosphere. Dominant dendritic and inter-dendritic phases were identified from the electron micrographs of these HEA. The area of inter-dendrite region increased for both FeCrNiMnCoTax and Al0.5FeCrNiMnCoTax alloys with the increasing of Ta content. The major phases in both FeCrNiMnCoTax and Al0.5FeCrNiMnCoTax alloys were identified as FCC and BCC solid-solutions. Addition of Al in Al0.5FeCrNiMnCoTax alloys has resulted in precipitation of a minor phase which was identified as FCC-TaCr2 Laves phase. As the Ta content increased, hardness of FeCrNiMnCoTax and Al0.5FeCrNiMnCoTax alloys increased from 200.34 Hv to 345.10 Hv and 385.22 Hv to 570.86 Hv respectively. Furthermore, presence of Laves phase in Al0.5FeCrNiMnCoTax alloys has resulted in higher hardness values compared to Al free sample, and this higher hardness could be attributed to precipitation strengthening effect by Laves intermetallic phase formation.

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Microstructure and Mechanical Performance of Brand‐New Al_0.3CrFe_1.5MnNi_0.5 High‐Entropy Alloys

Cited by 22 publications

References 20 publications

High-entropy alloys: a critical assessment of their founding principles and future prospects

High-entropy alloys: a critical assessment of their founding principles and future prospects

Effect of post weld heat treatment on weldability of high entropy alloy welds

Effect of Ta Addition on Microstructure and Hardness of FeCrNiMnCoTa<sub>x</sub> and Al<sub>0.5</sub>FeCrNiMnCoTa<sub>x</sub> High-Entropy Alloys

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