Materials selection considerations for high entropy alloys

Fu, Xiouhua; Schuh, Christopher A.; Olivetti, Elsa

doi:10.1016/j.scriptamat.2017.03.014

Cited by 97 publications

(26 citation statements)

References 45 publications

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“…The theoretical density of the AlFeMnSi CCA was 4.5 g/cm 3 [15], which is comparable with the density of Ti (4.5 g/cm 3 ) and significantly lower than that of austenitic stainless steel 304L (8 g/cm 3 ). The elemental cost of the alloy, determined using a 50 year average price of individual elements [16], was 1.18 $/kg which is notably lower than commonly used corrosion resistant alloys such as SS 304L (2.20 $/kg) or Figure 1d. The solution resistance (Rs) was estimated at a high frequency (100 kHz), R film and CPE film represent the resistance and capacitance of the passive film, and R ct and CPE dl are the charge transfer resistance and double layer capacitance, respectively at low frequency.…”

Section: Development Of the Corrosion Resistant Alloys With Propertiementioning

confidence: 82%

A low-cost, low-density and corrosion resistant compositionally complex alloy: AlFeMnSi

O’Brien¹,

Esteves²,

Birbilis³

et al. 2020

Preprint

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A new class of compositionally complex alloy, consisting of equiatomic concentrations of Al, Fe, Mn and Si is reported. The alloy was characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy. Corrosion behavior of the AlFeMnSi alloy, as evaluated using potentiodynamic polarization tests and electrochemical impedance spectroscopy in 0.6 M NaCl solution, was comparable with that of stainless steel (SS) 304L. X-ray photoelectron spectroscopy was used to study the AlFeMnSi surface film. The AlFeMnSi alloy also exhibited a lower cost, lower density, and a higher hardness as compared with SS 304L, rendering it a promising alloy for bespoke applications.

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Section: Development Of the Corrosion Resistant Alloys With Propertiementioning

confidence: 82%

A low-cost, low-density and corrosion resistant compositionally complex alloy: AlFeMnSi

O’Brien¹,

Esteves²,

Birbilis³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…For more than two decades, binary and ternary alloys using practically every element in the periodic table have been tracked and their phase diagrams described with unprecedented accuracy, both experimentally and computationally ( [294][295][296]. The emergence of multi-component alloys (MCA) or (single-phase) high-entropy alloys (SP-HEA) in the present decade has boosted an immense and renewed interest in the stability, structural, electronic, elastic, magnetic, and thermodynamic properties of these combinations of several elements, none of which, in contrast to preceding alloying methodologies, can be said to be predominant [297][298][299][300][301]. Figure 18 shows an example of data retrieval from two heavily used and pioneering repositories after searching for W-C-Co.…”

Section: Data Miningmentioning

confidence: 99%

The Critical Raw Materials in Cutting Tools for Machining Applications: A Review

et al. 2020

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A variety of cutting tool materials are used for the contact mode mechanical machining of components under extreme conditions of stress, temperature and/or corrosion, including operations such as drilling, milling turning and so on. These demanding conditions impose a seriously high strain rate (an order of magnitude higher than forming), and this limits the useful life of cutting tools, especially single-point cutting tools. Tungsten carbide is the most popularly used cutting tool material, and unfortunately its main ingredients of W and Co are at high risk in terms of material supply and are listed among critical raw materials (CRMs) for EU, for which sustainable use should be addressed. This paper highlights the evolution and the trend of use of CRMs) in cutting tools for mechanical machining through a timely review. The focus of this review and its motivation was driven by the four following themes: (i) the discussion of newly emerging hybrid machining processes offering performance enhancements and longevity in terms of tool life (laser and cryogenic incorporation); (ii) the development and synthesis of new CRM substitutes to minimise the use of tungsten; (iii) the improvement of the recycling of worn tools; and (iv) the accelerated use of modelling and simulation to design long-lasting tools in the Industry-4.0 framework, circular economy and cyber secure manufacturing. It may be noted that the scope of this paper is not to represent a completely exhaustive document concerning cutting tools for mechanical processing, but to raise awareness and pave the way for innovative thinking on the use of critical materials in mechanical processing tools with the aim of developing smart, timely control strategies and mitigation measures to suppress the use of CRMs.

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“…The development of new alloys was restricted for past decades by the traditional alloying concept, that is, the alloying of more principal elements could lead to formation of the amorphous or complex intermetallic compounds and phases [21][22][23][24]. The introduction of the HEA concept accelerated the research in the field of materials science, where the concept of attaining simple solid solutions from multiple principal alloying elements have been established [25,26]. Yeh et al [4] illustrated that the addition of five or more principal alloying elements, each with an atomic percentage between 5 and 35 wt % could increase the configurational entropy at a random state (larger than 1.5R).…”

Section: Introductionmentioning

confidence: 99%

“…Researchers around the globe are extensively working on HEA research, and designing HEAs to tailor and improve the properties of the engineering materials [25][26][27]. One such application is the use of HEA as a reinforcement/binder in the metal matrix composites [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Tungsten Matrix Composite Reinforced with CoCrFeMnNi High-Entropy Alloy: Impact of Processing Routes on Microstructure and Mechanical Properties

Satyanarayana

Sokkalingam

Jena

et al. 2019

Metals

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Tungsten heavy alloy composite was developed by using novel CoCrFeMnNi high-entropy alloy as the binder/reinforcement phase. Elemental tungsten (W) powder and mechanically alloyed CoCrFeMnNi high-entropy alloy were mixed gently in high energy ball mill and consolidated using different sintering process with varying heating rate (in trend of conventional sintering < microwave sintering < spark plasma sintering). Mechanically alloyed CoCrFeMnNi high-entropy alloy have shown a predominant face-centered cubic (fcc) phase with minor Cr-rich σ-phase. Consolidated tungsten heavy high-entropy alloys (WHHEA) composites reveal the presence of Cr–Mn-rich oxide phase in addition to W-grains and high-entropy alloys (HEA) phase. An increase in heating rate restricts the tungsten grain growth with reduces the volume fraction of the Cr–Mn-rich phase. Finally, spark plasma sintering with a higher heating rate and shorter sintering time has revealed higher compressive strength (~2041 MPa) than the other two competitors (microwave sintering: ~1962 MPa and conventional sintering: ~1758 MPa), which may be attributed to finer W-grains and reduced fraction of Cr–Mn rich oxide phase.

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Materials selection considerations for high entropy alloys

Abstract: The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Fu, X. et al. "Materials selection considerations for high entropy alloys.

Cited by 97 publications

References 45 publications

A low-cost, low-density and corrosion resistant compositionally complex alloy: AlFeMnSi

A low-cost, low-density and corrosion resistant compositionally complex alloy: AlFeMnSi

The Critical Raw Materials in Cutting Tools for Machining Applications: A Review

Tungsten Matrix Composite Reinforced with CoCrFeMnNi High-Entropy Alloy: Impact of Processing Routes on Microstructure and Mechanical Properties

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