Ductile CoCrFeNiMox high entropy alloys strengthened by hard intermetallic phases

Liu, W.H.; Liu, Xiongjun; He, Jianping; Luan, Junhua; Wang, Zhi Jun; Liu, B.; Liu, Yong; Chen, Luyang; Liu, C.T.

doi:10.1016/j.actamat.2016.06.063

Cited by 717 publications

(201 citation statements)

References 42 publications

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“…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%

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: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…With the addition of other principal elements such as Cu, Ti, Mo, Mn, Al, Si, etc., the hardness of FeCoCrNi HEA was generally enhanced by solution hardening, precipitation strengthening, and the nanocomposite strengthening mechanism [5,17]. It was noteworthy that the FeCoCrNiMo bulk HEA was tremendously strengthened without causing a severe embrittlement [18]. Moreover, the addition of Mo provides excellent scuffing resistance to abrasive wear in coating materials [19][20][21].…”

Section: Introductionmentioning

confidence: 86%

“…It is evident that FeCoCrNiMo0.2 gas-atomized powders exhibit a single typical FCC-structure solid solution phase with diffraction peaks at 2θ = 43.66°, 50.82°, and 74.67° [18]. According to the empirical rules, solid solutions were generally formed in HEA systems under the following certain conditions.…”

Section: Hea Coatings Characterizationmentioning

confidence: 99%

Microstructure and Wear Behavior of FeCoCrNiMo0.2 High Entropy Coatings Prepared by Air Plasma Spray and the High Velocity Oxy-Fuel Spray Processes

Liu

et al. 2017

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Abstract:In the present research, the spherical FeCoCrNiMo0.2 high entropy alloy (HEA) powders with a single FCC solid solution structure were prepared by gas atomization. Subsequently, the FeCoCrNiMo0.2 coatings with a different content of oxide inclusions were prepared by air plasma spraying (APS) and high-velocity oxy-fuel spraying (HVOF), respectively. The microstructure, phase composition, mechanical properties, and tribological behaviors of these HEA coatings were investigated. The results showed that both HEA coatings showed a typical lamellar structure with low porosity. Besides the primary FCC phase, a mixture of Fe 2 O 3 , Fe 3 O 4 , and AB 2 O 4 (A = Fe, Co, Ni, and B = Fe, Cr) was identified as the oxide inclusions. The oxide content of the APS coating and HVOF coating was calculated to be 47.0% and 12.7%, respectively. The wear resistance of the APS coating was approximately one order of magnitude higher than that of the HVOF coating. It was mainly attributed to the self-lubricated effect caused by the oxide films. The mass loss of the APS coating was mainly ascribed to the breakaway of the oxide film, while the main wear mechanism of the HVOF coating was the abrasive wear.

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“…Solid solution forming alloys have been developed in conventional alloys where there exits only one dominant element, and amorphous alloys used to be explored near eutectic compositions1718. With the design concept of HEAs becoming more accepted by the materials community, more and more simple face-center cubic (FCC), body-center cubic (BCC), and hexagonal close-packed (HCP) solid solution forming HEAs and amorphous HEAs have been developed, some of which exhibit good mechanical1920212223, physical24252627, chemical28 and biomedical13 properties. Therefore, HEAs provide new opportunities to design new alloys with potentially new properties.…”

mentioning

confidence: 99%

Parametric Study of Amorphous High-Entropy Alloys formation from two New Perspectives: Atomic Radius Modification and Crystalline Structure of Alloying Elements

Guo

Wang

et al. 2017

Sci Rep

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Chemical and topological parameters have been widely used for predicting the phase selection in high-entropy alloys (HEAs). Nevertheless, previous studies could be faulted due to the small number of available data points, the negligence of kinetic effects, and the insensitivity to small compositional changes. Here in this work, 92 TiZrHfM, TiZrHfMM, TiZrHfMMM (M = Fe, Cr, V, Nb, Al, Ag, Cu, Ni) HEAs were prepared by melt spinning, to build a reliable and sufficiently large material database to inspect the robustness of previously established parameters. Modification of atomic radii by considering the change of local electronic environment in alloys, was critically found out to be superior in distinguishing the formation of amorphous and crystalline alloys, when compared to using atomic radii of pure elements in topological parameters. Moreover, crystal structures of alloying element were found to play an important role in the amorphous phase formation, which was then attributed to how alloying hexagonal-close-packed elements and face-centered-cubic or body-centered-cubic elements can affect the mixing enthalpy. Findings from this work not only provide parametric studies for HEAs with new and important perspectives, but also reveal possibly a hidden connection among some important concepts in various fields.

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Ductile CoCrFeNiMox high entropy alloys strengthened by hard intermetallic phases

Cited by 717 publications

References 42 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

Microstructure and Wear Behavior of FeCoCrNiMo0.2 High Entropy Coatings Prepared by Air Plasma Spray and the High Velocity Oxy-Fuel Spray Processes

Parametric Study of Amorphous High-Entropy Alloys formation from two New Perspectives: Atomic Radius Modification and Crystalline Structure of Alloying Elements

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