Effects of Al addition on structural evolution and tensile properties of the FeCoNiCrMn high-entropy alloy system

He, Junyang; Liu, W.H.; Wang, H.; Wu, Yuan; Liu, X.J.; Nieh, T.G.

doi:10.1016/j.actamat.2013.09.037

Cited by 1,182 publications

(376 citation statements)

References 30 publications

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“…The ingots were subsequently drop-cast into a copper mold, and the details regarding the casting process can be found in literature. [31] The nominal density used in present study was measured by the Archimedean method. The longitudinal wave speed was determined via ultrasonic pulse-echo technique at the National Institute of Metrology of China, and the Poisson's ratio was obtained from previous studies.…”

Section: Methodsmentioning

confidence: 99%

Shock compression response of high entropy alloys

Jiang

Wang

et al. 2016

Materials Research Letters

116

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In this work, we studied the shock response of two typical equiatomic high entropy alloys (HEAs) (i.e. FCC-structured CrMnFeCoNi alloy and BCC-structured NiCoFeCrAl alloy). The experimental results show that these two HEAs exhibit a relatively high Hugoniot elastic limit and high-phase transition threshold stress. We attribute this anomalous dynamic response of HEAs to their intrinsic chemically disordered structures. This work may provide new insight into shock compression behavior of HEAs. IMPACT STATEMENTThis is the first work to demonstrate that high entropy alloys (HEAs) behave 'super-stably' under shock loading, which may provide new insight into shock compression behavior of HEAs. ARTICLE HISTORY

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Section: Methodsmentioning

confidence: 99%

Shock compression response of high entropy alloys

Jiang

Wang

et al. 2016

Materials Research Letters

116

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“…Indeed, the values for Q/T m are also higher than any of those presented by Brown and Ashby 215 for fcc binary alloys -Tsai et al 209 209 Aside from direct measurements of diffusivities, there is a great deal of experimental evidence that implies that atomic movement in HEAs is not unusually sluggish. Of particular prominence are observations of precipitation in many as-cast HEA samples, 1,21,62,[70][71][72]75,91,99,100,114,121,123,127,147,172 including those subjected to very rapid cooling, 73,132,170,171 as well as in those quenched from high temperature heat treatments. 31,72,174 Indeed, it has recently been revealed that Ni-Al-based B2 precipitates are able to form on air cooling the HEA Al 0.5 CrFeCoNiCu 74 from high temperatures.…”

Section: Sluggish Diffusion Kineticsmentioning

confidence: 99%

“…Straightforward low-resolution SEM analysis is not usually sufficient to achieve this, since nanoscale precipitation and phase separations have often been reported. 1,18,20,21,34,62,72,73,75,86,91,93,99,104,114,123,127,131,133,160,[170][171][172][173][174] Techniques such as atom-probe tomography (APT) or scanning transmission electron microscopy (STEM) are required, see, for example, Fig. 3.…”

Section: Entropic Stabilisationmentioning

confidence: 99%

“…First, appropriate heat treatments must be selected to homogenise as-cast material, and then promote phase decomposition. Focus should be away from as-cast microstructures, which have received a great deal of attention in many HEA studies, [1][2][3]27,30,[61][62][63][64]76,79,[87][88][89][90][91]94,96,102,109,111,113,120,122,123,126,130,[133][134][135][136]141,[146][147][148][149][150][151][152][153][154][155][156][157][158][159][160][161][162][163]…”

Section: Entropic Stabilisationmentioning

confidence: 99%

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

Pickering

Jones

2016

International Materials Reviews

736

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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“…Recently, a novel class of advanced structural materials, called High-Entropy Alloys (HEAs) or Multi-Principal-Element Alloys (MPEAs), has been proposed and developed [5][6][7][8][9][10][11][12][13][14][15][16][17]. Compared with conventional alloys containing one or two principal elements, HEAs are usually composed of five or more elements with equimolar or near equimolar elemental fractions, which form disordered solidsolution phases, specifically body-centered-cubic (BCC) and/or face-centered-cubic (FCC) phases.…”

mentioning

confidence: 99%

Alloying and Processing Effects on the Aqueous Corrosion Behavior of High-Entropy Alloys

Tang

Huang

et al. 2014

Entropy

185

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Abstract:The effects of metallurgical factors on the aqueous corrosion behavior of highentropy alloys (HEAs) are reviewed in this article. Alloying (e.g., Al and Cu) and processing (e.g., heat treatments) effects on the aqueous corrosion behavior of HEAs, including passive film formation, galvanic corrosion, and pitting corrosion, are discussed in detail. Corrosion rates of HEAs are calculated using electrochemical measurements and the weight-loss method. Available experimental corrosion data of HEAs in two common solutions [sulfuric acid (0.5 M H 2 SO 4 ) and salt water (3.5 weight percent, wt.%, NaCl)], such as the corrosion potential (E corr ), corrosion current density (i corr ), pitting potential (E pit ), and passive region (ΔE), are summarized and compared with conventional corrosionresistant alloys. Possible directions of future work on the corrosion behavior of HEAs are suggested.

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Effects of Al addition on structural evolution and tensile properties of the FeCoNiCrMn high-entropy alloy system

Cited by 1,182 publications

References 30 publications

Shock compression response of high entropy alloys

Shock compression response of high entropy alloys

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

Alloying and Processing Effects on the Aqueous Corrosion Behavior of High-Entropy Alloys

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