In-situ neutron diffraction studies on high-temperature deformation behavior in a CoCrFeMnNi high entropy alloy

Woo, Wanchuck; Huang, E-Wen; Yeh, Jien Wei; Choo, Hahn; Lee, Chi; Tu, Shan Yi

doi:10.1016/j.intermet.2015.02.020

Cited by 66 publications

(34 citation statements)

References 19 publications

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“…Its yield strength is a strong function of temperature, increasing markedly with decreasing temperature. 36,38,40,41,303 This in itself is not unexpected, since although such temperature dependence is rare in pure fcc metals, it is observed in a number of fcc alloy solid solutions. 179,[304][305][306][307][308][309] What is unusual, however, is that this increase in yield stress at lower temperatures is accompanied by significant increases in ductility, toughness and ultimate-tensile strength (UTS).…”

Section: Improved Understandingmentioning

confidence: 80%

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

Pickering

Jones

2016

International Materials Reviews

700

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: Improved Understandingmentioning

confidence: 80%

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

Pickering

Jones

2016

International Materials Reviews

700

299

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“…Co 20 Cr 20 Fe 20 Mn 20 Ni 20 (at.%) which develops a single phase fcc solid solution e.g. [9,[12][13][14][15][16]. Recently, it has been shown that a non-equiatomic composition of this alloy system also exhibits a single phase fcc solid solution irrespective of its slightly lower mixing entropy [17,18].…”

Section: Introductionmentioning

confidence: 99%

Phase stability of non-equiatomic CoCrFeMnNi high entropy alloys

et al. 2015

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“…For the CoCrFeMnNi HEA, the sample was fabricated by vacuum arc-melting (arc) with equal molar compositions of constituent powders whose purity is more than 99.9% (in weight percent) and the diffraction characteristics of the CoCrFeMnNi HEA are also well studied for its microstructure [10,[18][19][20].…”

Section: Methodsmentioning

confidence: 99%

Comparing Cyclic Tension-Compression Effects on CoCrFeMnNi High-Entropy Alloy and Ni-Based Superalloy

et al. 2019

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An equal-molar CoCrFeMnNi, face-centered-cubic (fcc) high-entropy alloy (HEA) and a nickel-based superalloy are studied using in situ neutron diffraction experiments. With continuous measurements, the evolution of diffraction peaks is collected for microscopic lattice strain analyses. Cyclic hardening and softening are found in both metallic systems. However, as obtained from the diffraction-peak-width evolution, the underneath deformation mechanisms are quite different. The CoCrFeMnNi HEA exhibits distinct lattice strain and microstructure responses under tension-compression cyclic loadings.

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In-situ neutron diffraction studies on high-temperature deformation behavior in a CoCrFeMnNi high entropy alloy

Cited by 66 publications

References 19 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

Phase stability of non-equiatomic CoCrFeMnNi high entropy alloys

Comparing Cyclic Tension-Compression Effects on CoCrFeMnNi High-Entropy Alloy and Ni-Based Superalloy

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