Effect of Mo and Ni elements on microstructure evolution and mechanical properties of the CoFeNixVMoy high entropy alloys

Jiang, Lipeng; Cao, Zhiqiang; Jie, Jinchuan; Zhang, J.J.; Lu, Yiping; Wang, T.M.; Li, T.J.

doi:10.1016/j.jallcom.2015.07.185

Cited by 140 publications

(17 citation statements)

References 24 publications

(33 reference statements)

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“…Similarly, fully eutectic structures have been obtained in CoFeNi x VMo y HEAs at both CoFeNi 1.4 VMo and CoFeNiVMo 0.6 [14]. Recently, Lu et al [34] have proposed a strategy to design eutectic high-entropy alloys (EHEAs) based on ΔH mix .…”

Section: Discussionmentioning

confidence: 99%

“…HEAs are defined as alloys containing at least five major elements wherein every major element has an atomic fraction between 5% and 35% [9]. Various studies on HEAs, including composition, processing, crystal structure and microstructure, and physical and mechanical properties, have been performed in the past years [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. …”

Section: Introductionmentioning

confidence: 99%

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Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys

et al. 2018

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To study the effect of alloy composition on phase selection in the CoCrCu0.1FeMoNi high-entropy alloy (HEA), Mo was partially replaced by Co, Cr, Fe, and Ni. The microstructures and phase selection behaviors of the CoCrCu0.1FeMoNi HEA system were investigated. Dendritic, inter-dendritic, and eutectic microstructures were observed in the as-solidified HEAs. A simple face centered cubic (FCC) single-phase solid solution was obtained when the molar ratio of Fe, Co, and Ni was increased to 1.7 at the expense of Mo, indicating that Fe, Co, and Ni stabilized the FCC structure. The FCC structure was favored at the atomic radius ratio δ ≤ 2.8, valence electron concentration (VEC) ≥ 8.27, mixing entropy ΔS ≤ 13.037, local lattice distortion parameter α2 ≤ 0.0051, and ΔS/δ2 > 1.7. Mixed FCC + body centered cubic (BCC) structures occurred for 4.1 ≤ δ ≤ 4.3 and 7.71 ≤ VEC ≤ 7.86; FCC or/and BCC + intermetallic (IM) mixtures were favored at 2.8 ≤ δ ≤ 4.1 or δ > 4.3 and 7.39 < VEC ≤ 8.27. The IM phase is favored at electronegativity differences greater than 0.133. However, ΔS, α2, and ΔS/δ2 were inefficient in identifying the (FCC or/and BCC + IM)/(FCC + BCC) transition. Moreover, the mixing enthalpy cannot predict phase structures in this system.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys

et al. 2018

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“…High-entropy alloys (HEAs) were introduced in the 1990s [1,2] and overcame the limitations of traditional alloys and became popular due to their simple phase structure [3][4][5][6][7][8][9] and excellent mechanical properties [10][11][12][13][14][15][16]. Heat treatment of traditional as-cast alloys can eliminate internal structural defects and stresses and improve their properties [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of deep cryogenic treatment on the microstructure and mechanical properties of AlCrFe₂Ni₂ High-entropy alloy

Zhang

et al. 2020

Mater. Res. Express

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The influence of deep cryogenic treatment on the microstructure and properties of AlCrFe 2 Ni 2 highentropy alloy were studied by examining its phase composition, microstructure, and properties after cryogenic treatment. The results showed that as the cryogenic treatment increased, the alloy was composed of face-centered cubic (FCC) and body-centered cubic (BCC) phases. As the treatment time increased, the grain orientation of the BCC phase and B2 phase changed and transformed into each other, and the band FCC phase structures became shorter and more disordered. Deep cryogenic treatment effectively improved the hardness, yield strength, and wear resistance of the alloy. The alloy displayed the best performance with a holding time of 4 h, and the Vickers hardness (338 HV) was 11.6% higher than the as-cast alloy, and the yield strength (920 MPa) was 22.7% higher. The friction coefficient was 0.643, and the wear resistance was also significantly improved.

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“…The advent of HEAs caused a paradigmatic shift in the design of modern alloys [1,2]. Various studies have proved that HEAs possess high strength from their severe lattice distortion effects, and good high temperature creep and softening resistance properties from their sluggish diffusion effect [3][4][5][6][7][8]. In this study, benefiting from the phase formation rules of HEAs, which is summarised in table 1, a multi-principal element alloy based on iron (Fe), manganese (Mn), aluminum (Al) and nickel (Ni), with a single FCC phase has been designed.…”

Section: Introductionmentioning

confidence: 99%

A novel medium entropy alloy based on iron-manganese-aluminum-nickel: influence of boron addition on phase formation, microstructure, and mechanical properties

Mohsen

2019

Mater. Res. Express

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A novel Medium Entropy Alloy (MEA) based on Fe-Mn-Al-Ni has been designed adopting High Entropy Alloys' (HEAs) phase formation rules, and the effects of minor boron addition on phase content and mechanical properties have been separately investigated. Boron-free Fe (52.71-x) Mn 31.11 Al 5.09 Ni 11.08 B x (x=0, 0.05, 0.2, 0.5, 0.7 wt%) MEA showed a single face-centered cubic (FCC) structure. XRD results indicated that with 0.05 and 0.2 wt% boron addition the system maintains its single-phase structure. Further boron addition led to the formation of metal boride intermetallics by the volume fractions of 4.6 and 6.1% of Fe 2 B intermetallic phase in as-cast and 2.7 and 5.4% in Deformed and Heat-treated (D&H) samples according to Rietveld analysis for 0.5 and 0.7 wt% boron doped alloys, respectively. Boron addition had a positive effect on grain size reduction of the system where just by 0.05 wt% boron addition the grain size has been almost halved compared to boron free as-cast sample. Moreover, it was observed that as the boron level increases, the hardness value increases. With in the all samples subjected to thermomechanical process, 0.7wt % boron doped alloy showed the best yield strength (increasing by ∼50%, from 151 MPa to 222.5 MPa) and ultimate tensile strength (increasing by ∼15%, from 476 MPa to 543 MPa) compared to undoped MEA at comparable ductility (ε>60%).

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Effect of Mo and Ni elements on microstructure evolution and mechanical properties of the CoFeNixVMoy high entropy alloys

Cited by 140 publications

References 24 publications

Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys

Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys

Effect of deep cryogenic treatment on the microstructure and mechanical properties of AlCrFe₂Ni₂ High-entropy alloy

A novel medium entropy alloy based on iron-manganese-aluminum-nickel: influence of boron addition on phase formation, microstructure, and mechanical properties

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Effect of Mo and Ni elements on microstructure evolution and mechanical properties of the CoFeNixVMoy high entropy alloys

Cited by 140 publications

References 24 publications

Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys

Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys

Effect of deep cryogenic treatment on the microstructure and mechanical properties of AlCrFe2Ni2 High-entropy alloy

A novel medium entropy alloy based on iron-manganese-aluminum-nickel: influence of boron addition on phase formation, microstructure, and mechanical properties

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Effect of deep cryogenic treatment on the microstructure and mechanical properties of AlCrFe₂Ni₂ High-entropy alloy