Deformation mechanism during high-temperature tensile test in an eutectic high-entropy alloy AlCoCrFeNi2.1

Zhang, Yaoli; Wang, Xinguang; Li, Jinguo; Huang, Yunyou; Lu, Yiping; Sun, Xiaofeng

doi:10.1016/j.msea.2018.03.078

Cited by 100 publications

(22 citation statements)

References 39 publications

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“…HEAs are composed of at least four elements mixed in equiatomic or nearly equiatomic ratios and have a single-phase microstructure, possessing remarkable mechanical properties, high wear resistance, exceptional fatigue resistance, excellent corrosion resistance and high resistance to anneal softening [4][5][6][7]. Based on the phase constitution, HEAs can be divided into four types as follows: face-centered cubic (FCC) single-phase HEAs (e.g., CoCrFeNi and CoCrFeNiMn) [8][9][10], body-centered cubic (BCC) single-phase HEAs (e.g., TiNbTaZrAl, VNbMoTaW and HfNbTaTiZr) [11][12][13], hexagonal close-packed (HCP) single-phase HEAs (e.g., GdDyErHoTb and GdErHoTb) [14] and multiple-phase HEAs (e.g., AlCoCrFeNiCu, AlCoCrFeNi 2.1 and CoCrFeNiMo 0.5 W 0.5 ) [15][16][17]. The microstructures and properties of these HEAs have been thoroughly investigated and reported.…”

Section: Introductionmentioning

confidence: 99%

In Situ Development and High Temperature Features of CoCrFeNi-M6Cp High Entropy-Alloy Based Hardmetal

Lin

Liang

et al. 2020

Metals

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In this work, an in-situ CoCrFeNi-M6Cp high entropy-alloy (HEA) based hardmetal with a composition of Co25Cr21Fe18Ni23Mo7Nb3WC2 was fabricated by the powder metallurgy (PM) method. Microstructures and mechanical properties of this HEA were characterized and analyzed. The results exhibit that this HEA possesses a two-phase microstructure consisting of the face-centered cubic (FCC) matrix phase and the carbide M6C phase. This HEA has an average grain size of 2.2 μm, and the mean size and volume fraction of carbide particles are 1.2 μm and 20%. The tensile tests show that the alloy has a yield strength of 573 MPa, ultimate tensile strength of 895 MPa and elongation of 5.5% at room temperature. The contributions from different strengthening mechanisms in this HEA were calculated. The grain boundary strengthening is the dominant strengthening mechanism, and the carbide particles are significant for the further enhancement of yield strength by the dislocation strengthening and Orowan strengthening. In addition, with increasing temperatures from 600 °C to 900 °C, the HEA shows a reduced yield strength (YS) from 473 MPa to 142 MPa, a decreased ultimate tensile strength (UTS) from 741 MPa to 165 MPa and an enhanced elongation from 10.5% to 31%.

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Section: Introductionmentioning

confidence: 99%

In Situ Development and High Temperature Features of CoCrFeNi-M6Cp High Entropy-Alloy Based Hardmetal

Lin

Liang

et al. 2020

Metals

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“…The essential design strategy of strong and ductile EHEAs is to grain strength from a hard phase and ductility from a soft phase, where the soft and hard phases being the product of a eutectic reaction [5]. The resulting eutectic structure is expected to provide a good thermal stability and a high-temperature softening resistance [6][7][8], making the EHEAs promising for high-temperature applications. The selection for the hard and soft phases on EHEAs has to be careful though, to achieve the desirable balance of strength and ductility.…”

mentioning

confidence: 99%

“…Hence, developing strong EHEAs with retained plasticity and strain hardening capability at high temperatures is of great interest for many industrial applications [2,11]. Moreover, despite that a brittle-to-ductile transition with increasing deformation temperatures has been reported for many EHEAs [7,8,11], the underneath fracture mechanism has not been studied in detail. This motivated us to investigate the high-temperature deformation behavior of a non-equimolar EHEA with a nominal composition of Co 27.6 Cr 22.6 Fe 19.6 Ni 23.4 Ta 3.4 Zr 2.5 Al 0.9 (in at.…”

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confidence: 99%

A eutectic high-entropy alloy with good high-temperature strength-plasticity balance

Han

Wang

et al. 2019

Materials Research Letters

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We developed a eutectic high-entropy alloy (EHEA) with appreciable high-temperature strengthplasticity balance. Structural characterizations of the as-cast sample revealed a lamellar structure with austenite (face-centered-cubic, FCC) and Laves phases. Upon annealing at 873 K, precipitation of nanoscale (Ni, Al, and Zr)-rich L1 2 phase from the FCC phase took place, which eventually transformed into a martensitic (hexagonal,) phase with rearrangement of atomic species. Compressive properties revealed a brittle behavior at temperatures below 873 K, but changed to a ductile behavior with considerable strain hardening at 973 K, due to the formation of a high density of deformation twins observed by transmission electron microscopy. IMPACT STATEMENT A eutectic high-entropy alloy with attractive high-temperature compressive strength-plasticity balance was realized by tuning the microstructure via heat treatment, during which nanoscale L1 2 phase formed within the FCC matrix phase.

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“…However, during the investigation of HEA, there are some HEA show a combination of high elongation and excellent tensile strength, for example, the eutectic HEA (EHEA) AlCoCrFeNi2.1 has achieved the ductility and strength trade-off which has a 12% elongation with a 1.2GPa ultimate tensile strength. [1,5] This alloy also shows an excellent high-temperature ductility and strength, which has the potential to be used as a superstructural material or material for parts of machine working under high temperature.…”

Section: The Contradiction Between Strength and Ductility Is A Centurmentioning

confidence: 99%

“…Yeh also demonstrated four core effects that lead to the unique properties of high entropy alloys, which will be discussed in Section2.1. The formation of HEAs leads to a comprehensive superb properties alloys, like excellent specific strength [3], structural stability under pressure and temperature [4], good corrosion resistant [5] and some other superb mechanical properties compare to the traditional alloy which usually has monotonous excellent properties. The unique atomic structure has drawn increasing attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

UQ eSpace

Chen¹

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The cost-effective iron-based eutectic high entropy alloys (HEAs) that contain four compositions, Fe, Ni, Cr, Mo was prepared by arc melting by Yin et al.[1]. Precipitate strengthening was done to improve the ductility and strength trade-off of Fe45Ni25Cr25Mo5(at. %). The chosen alloy is a hypo-eutectic high entropy alloy mainly contains single FCC phase and eutectic phase (σ phase + FCC phase). The as-cast alloys (hardness = 202HV) were aging treated under 600℃-1000℃ with aging time from 1 to 96 hours. Cr-Mo riched needle-like precipitates formed at the eutectic phase boundary during aging, the hardness of this alloy reaches 300HV under 900℃-48Hours aging. However, the hardness drops to 250HV, when overaging took place under 1000 ℃ aging. For further improving the mechanical properties, minor elements Ti and Al were added with 1 to 5at.% during sample preparation. Sample with 2% Ti-Al addition(Hardness = 260HV) had the optimum balanced hardness and ductility, which was then aging treated under 700-900℃ for 2-96Hours. The hardness raised to 534HV since similar needle-like precipitate formed in FCC matrix with a smaller size(~5μm).

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Deformation mechanism during high-temperature tensile test in an eutectic high-entropy alloy AlCoCrFeNi2.1

Cited by 100 publications

References 39 publications

In Situ Development and High Temperature Features of CoCrFeNi-M6Cp High Entropy-Alloy Based Hardmetal

In Situ Development and High Temperature Features of CoCrFeNi-M6Cp High Entropy-Alloy Based Hardmetal

A eutectic high-entropy alloy with good high-temperature strength-plasticity balance

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