Phase Evolution and Densification Behavior of Nanocrystalline Multicomponent High Entropy Alloys During Spark Plasma Sintering

Sathiyamoorthi, Praveen; Murty, B.S.; Kottada, Ravi Sankar

doi:10.1007/s11837-013-0759-0

Cited by 96 publications

(46 citation statements)

References 27 publications

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“…Formation of FCC HEA for CoFeMnNi is expected since Co, Mn and Ni are all FCC stabilizers in steels. The present authors noticed a recent study by Praveen et al [35] reported formation of single-phase FCC in CoFeMnNi using mechanical alloying technique, but it is worth noting that they also observed  phase formation in CoCrFeNi which is contradictory to [5]. Confirmation of the single-phase nature of FCC solid solution via solidification is currently being conducted.…”

Section: Hints From Existing Binary and Ternary Phase Diagramsmentioning

confidence: 49%

“…The electronic-energy-convergence criterion was set to 1 × 10 −4 meV/at. AIMD simulations were performed at temperatures of 1673, 2273, and 1200 K for a total simulation time of 30,35, and 30 ps with the plane-wave cutoff energy set at 273.2, 223.7, and 273.2 eV for Al 1.3 CoCrCuFeNi, HfNbTaTiZr, and CuNiPPdPt respectively. Phase diagram calculations were done using the TTNI-8 database supplied with the ThermoCalc software [23] although other databases such as SSOL5 and TCNI5 were also tested and compared.…”

Section: Computational Methodologiesmentioning

confidence: 99%

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Searching for Next Single-Phase High-Entropy Alloy Compositions

Gao

Alman

2013

Entropy

265

111

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There has been considerable technological interest in high-entropy alloys (HEAs) since the initial publications on the topic appeared in 2004. However, only several of the alloys investigated are truly single-phase solid solution compositions. These include the FCC alloys CoCrFeNi and CoCrFeMnNi based on 3d transition metals elements and BCC alloys NbMoTaW, NbMoTaVW, and HfNbTaTiZr based on refractory metals. The search for new single-phase HEAs compositions has been hindered by a lack of an effective scientific strategy for alloy design. This report shows that the chemical interactions and atomic diffusivities predicted from ab initio molecular dynamics simulations which are closely related to primary crystallization during solidification can be used to assist in identifying single phase high-entropy solid solution compositions. Further, combining these simulations with phase diagram calculations via the CALPHAD method and inspection of existing phase diagrams is an effective strategy to accelerate the discovery of new single-phase HEAs. This methodology was used to predict new singlephase HEA compositions. These are FCC alloys comprised of CoFeMnNi, CuNiPdPt and CuNiPdPtRh, and HCP alloys of CoOsReRu.

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Section: Hints From Existing Binary and Ternary Phase Diagramsmentioning

confidence: 49%

Section: Computational Methodologiesmentioning

confidence: 99%

Searching for Next Single-Phase High-Entropy Alloy Compositions

Gao

Alman

2013

Entropy

265

111

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“…And the 230 µm-thickness sample did not show the weak diffraction peaks. The Cr-enriched sigma phases have been detected in other HEAs such as CoCrFeNi [18], Co 0.5 CrFeMn 1.5 Ni [32], CoCr 2 FeNi HEAs [32] and CoCrFeMnNi [33]. It is noted that the formation of B2 phase takes place at both 700 and 900 • C for 72 h in Al 0.3 CoCrFeNi HEAs [12].…”

Section: Methodsmentioning

confidence: 85%

“…Despite those advances in studying microstructure and mechanical properties of mm-sized HEAs [12][13][14], systematic investigations into the mechanical behavior of annealed HEAs [15,16], especially at small scales, is lacking [17]. Praveeno et al [18] observed the phase transformation from BCC to sigma in CoFeNi-Cr HEAs after annealing at 500-600 • C. Wu [19] studied the phase stability and recovery, recrystallization, and grain growth of the FeNiCoCrMn HEAs after rolling and annealing. Wang et al [20] studied size effects on the microstructures and mechanical properties of AlCoCrFeNi HEAs.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Al0.25CoCrFeNi High-Entropy Alloy after Recrystallization

Hou

Zhang

Yang

et al. 2017

Metals

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Cold rolling with subsequent annealing can be used to produce the recrystallized structure in high entropy alloys (HEAs). The Al 0.25 CoCrFeNi HEAs rolled to different final thickness (230, 400, 540, 800, 1000, 1500 µm) are prepared to investigate their microstructure evolutions and mechanical behaviors after annealing. Only the single face-centered cubic phase was obtained after cold rolling and recrystallization annealing at 1100 • C for 10 h. The average recrystallized grain size in this alloy after annealing ranges from 92 µm to 136 µm. The annealed thin sheets show obviously size effects on the flow stress and formability. The yield strength and tensile strength decrease as t/d (thickness/average grain diameter) ratio decreases until the t/d approaches 2.23. In addition, the stretchability (formability) decreases with the decrease of the t/d ratio especially when the t/d ratio is lower than about 6. According to the present results, yield strength can be expressed as a function of the t/d ratio.

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“…However, the segregation of Cu was observed in Cu containing HEAs due to its high enthalpy of mixing with other elements. [21,27,111,116] Besides, the modification of Al content has led to the significant changes in microstructure and mechanical properties of AlCrFeCoNi HEA. [109,117,118] For example, the alloy forms a single FCC phase when the Al content is less than a 0.45-mole fraction and single BCC phase when the Al content is more than a 0.9-mole fraction.…”

Section: Commonly Studied Alloysmentioning

confidence: 99%

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

2017

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Multi-principal elemental alloys, commonly referred to as high-entropy alloys (HEAs), are a new class of emerging advanced materials with novel alloy design concept. Unlike the design of conventional alloys, which is based on one or at most two principal elements, the design of HEA is based on multi-principal elements in equal or near-equal atomic ratio. The advent of HEA has revived the alloy design perception and paved the way to produce an ample number of compositions with different combinations of promising properties for a variety of structural applications. Among the properties possessed by HEAs, sluggish diffusion and strength retention at elevated temperature have caught wide attention. The need to develop new materials for high-temperature applications with superior high-temperature properties over superalloys has been one of the prime concerns of the high-temperature materials research community. The current article shows that HEAs have the potential to replace Ni-base superalloys as the next generation hightemperature materials. This review focuses on the phase stability, microstructural stability, and high-temperature mechanical properties of HEAs. This article will be highly beneficial for materials science and engineering community whose interest is in the development and understanding of HEAs for high-temperature applications.

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Phase Evolution and Densification Behavior of Nanocrystalline Multicomponent High Entropy Alloys During Spark Plasma Sintering

Cited by 96 publications

References 27 publications

Searching for Next Single-Phase High-Entropy Alloy Compositions

Searching for Next Single-Phase High-Entropy Alloy Compositions

Deformation Behavior of Al0.25CoCrFeNi High-Entropy Alloy after Recrystallization

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

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