Ultrafine-Grained AlCoCrFeNi<sub>2.1</sub>Eutectic High-Entropy Alloy

Wani, I. S.; Bhattacharjee, Tilak; Sheikh, Saad Ahmed; Lu, Yiping; Chatterjee, Subhradeep; Bhattacharjee, P.P.; Guo, Sheng; Tsuji, Nobuhiro

doi:10.1080/21663831.2016.1160451

Cited by 356 publications

(107 citation statements)

References 29 publications

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“…To date, the reported superior mechanical properties of HEAs, have been achieved mostly with multi-phase structures, which are principally attributed to the presence of second phases and phase metastability induced strengthening [2,[4][5][6][7][8][9][10]. Comparing with multi-phase HEAs, it is more difficult to attain a good combination of strength and ductility in single-phase HEAs at room temperature, particularly for single-phase fcc HEAs [2,11].…”

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confidence: 99%

Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

MacDonald

et al. 2018

Materials Research Letters

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Coarse-grained (CG) single-phase face-centered cubic (fcc) high-entropy alloys (HEAs) normally show insufficient room temperature strength. Here we design and implement a heterogeneous grain structure to strengthen a single-phase fcc Fe 29 Ni 29 Co 28 Cu 7 Ti 7 HEA. Significantly, the heterostructured (HS) fcc HEA shows a dramatic enhancement (increasing from ∼ 350 to ∼ 614 MPa) in tensile yield strength as compared to its CG counterpart. As a result of its extraordinary work-hardening ability arising from the heterogeneous grain structure, the novel HS HEA exhibits a very high ultimate strength of ∼ 1308 MPa, and a good ductility of ∼ 23.1% which is almost identical to that of its CG counterpart. IMPACT STATEMENTIntroducing a heterogeneous grain structure to a soft fcc Fe 29 Ni 29 Co 28 Cu 7 Ti 7 HEA, the heterostructured HEA shows significantly enhanced strengths at an essentially identical ductility as compared to the CG counterpart. ARTICLE HISTORY

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confidence: 99%

Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

MacDonald

et al. 2018

Materials Research Letters

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“…Up to now, multiple as-cast EHEAs with different constituent phases were reported to exhibited excellent mechanical properties [16][17][18][19][20][21][22][23][24][25][26]. Among these newly reported EHEAs, the FCC-based/BCC-based structure EHEAs were found displaying a favorable processability, as well as a desirable combination of strength and plasticity after thermo-mechanical treatment, which greatly promoted the engineering applications of HEAs in industrial fields [16,17,20,[23][24][25][26]. The excellent performance of this kind of EHEAs could be ascribed to not only the fine lamellar microstructure constituting by the alternative ductile and hard phases, but also the plenty of phase interface which induced significant interface hardening effect.…”

Section: Introductionmentioning

confidence: 99%

“…Although exhibiting multifarious engineering applications, great efforts still be made on HEAs to pursue more excellent mechanical properties. The typical strengthening mechanisms such as precipitation-hardening [6][7][8], TWIP (twinning-induced plasticity) [9,10], TRIP (transformation-induced plasticity) [11,12], and dual-phase structure [13][14][15][16][17][18][19][20][21][22][23][24][25][26] was introduced in HEAs to achieve the good combination of high strength and large plasticity. Among these strengthening mechanisms, dual-phase structure was widely used and found being able to effectively achieve a balance of strength and plasticity by reasonably collocating the constituent phase.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties variation with Ni content in Al_0.8CoCr_0.6Fe_0.7Ni_x (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

Wang

Jin

2020

Mater. Res. Express

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Eutectic high-entropy alloys have drawn extensive attention because of their remarkable performance on the combination of strength and plasticity. In this study, a new Al 0.8 CoCr 0.6 Fe 0.7 Ni x (x=1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system was designed; the microstructure and mechanical properties variation of alloys with the change in Ni content were investigated detailly. All of four alloys exhibited FCC+B2 dual-phase structure, while the volume fraction of FCC phase increased from 44% to 90% with an increase in Ni content. Meanwhile, the microstructure of alloys variated from an irregular dendrite morphology to a lamellar eutectic microstructure, and finally to a hypoeutectic microstructure composed by primary FCC phase and the rest eutectic mixture. Accordingly, the yield strength of alloys decreased from 625 MPa to 415 MPa, and the total elongation increased from 7.4% to 21.8%. The Al 0.8 CoCr 0.6 Fe 0.7 Ni 1.5 alloy displayed a nano-scale lamellar eutectic microstructure and exhibited a relatively good combination of strength and plasticity in these four alloys, with a yield strength of 490 MPa, a ultimate strength of 980 MPa and a total elongation of 14.8%. The findings could contribute to explore HEAs with good combination of strength and plasticity and promote the applications of high-entropy alloys in industrial fields.

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“…The very high work hardening is attributed to the fine lamellar structure with an alternate layer of soft FCC and hard BCC phase. In a similar line, Wani et al [89,90] attempted to enhance the mechanical properties of AlCoCrFeNi 2.1 alloy with duplex structure through thermomechanical processing and demonstrated a very high ultimate tensile strength of 1.2 GPa with a total elongation of %23%. He et al [91] attempted to design eutectic HEAs based on CoCrFeNiNb x and suggested that CrFeCoNiNb 0.5 exhibits a remarkable combination of fracture strength and ductility, with compressive fracture strength and ductility of above %2.3 GPa and %40%, respectively.…”

Section: Introductionmentioning

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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Ultrafine-Grained AlCoCrFeNi_2.1Eutectic High-Entropy Alloy

Cited by 356 publications

References 29 publications

Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

Microstructure and mechanical properties variation with Ni content in Al_0.8CoCr_0.6Fe_0.7Ni_x (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

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

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Ultrafine-Grained AlCoCrFeNi2.1Eutectic High-Entropy Alloy

Cited by 356 publications

References 29 publications

Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

Microstructure and mechanical properties variation with Ni content in Al0.8CoCr0.6Fe0.7Nix (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

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

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Ultrafine-Grained AlCoCrFeNi_2.1Eutectic High-Entropy Alloy

Microstructure and mechanical properties variation with Ni content in Al_0.8CoCr_0.6Fe_0.7Ni_x (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system