Precipitation behaviour and mechanical properties of a novel Al0.5MoTaTi complex concentrated alloy

Schliephake, Daniel; Medvedev, Alexander E.; Imran, Mohammad; Obert, Susanne; Fabijanic, Daniel; Heilmaier, Martin; Molotnikov, Andrey; Wu, Xinhua

doi:10.1016/j.scriptamat.2019.07.033

Cited by 18 publications

(10 citation statements)

References 23 publications

(35 reference statements)

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“…The pattern of the powders milled for 12 h is also presented for comparison. The theoretical crystal lattice parameter a mix of the bcc solid solution in non-equiatomic (W35Ta35Mo15Nb15)95Ni5 RHEA is calculated to be a mix = 0.324 nm using the rule of mixtures, while the lattice parameter of as-sintered bulk RHEA determined by the XRD is 0.320 nm based on Nelson-Riley approach [17]. It can be concluded that the calculated value for the (W35Ta35Mo15Nb15)95Ni5 RHEA is very close to the experimental result.…”

Section: Phase and Microstructure Of The Bulk Rheasupporting

confidence: 61%

“…where ε, D and b are lattice strain, grain size and Burgers vector, respectively. b is equal to √ 3 2 a (a is the lattice parameter determined in the means of the Nelson-Riley approach with the weighting function 1/2(cot 2 θ + cos θ cot θ) [17]) for a bcc structure, ε and D are calculated from the XRD patterns based on Equation (2).…”

Section: Alloying Processmentioning

confidence: 99%

“…(a is the lattice parameter determined in the means of the Nelson-Riley approach with the weighting function 1 2 ⁄ (cot 2 θ + cosθcotθ)[17]) for a bcc structure, ε and D are calculated from the XRD patterns based on Equation (2).…”

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confidence: 99%

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A Novel Non-Equiatomic (W35Ta35Mo15Nb15)95Ni5 Refractory High Entropy Alloy with High Density Fabricated by Powder Metallurgical Process

Duan

Liu

et al. 2020

Metals

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A non-equiatomic refractory high entropy alloy (RHEA), (W35Ta35Mo15Nb15)95Ni5 with high density of 14.55 g/cm3 was fabricated by powder metallurgical process of mechanical alloying (MA) and spark plasma sintering (SPS). The mechanical alloying behavior of the metallic powders was studied systematically, and the microstructure and phase composition for both the powders and alloys were analyzed. Results show that the crystal consists of the primary solid solution and marginal oxide inclusion (Nb5.7Ni4Ta2.3O2). In addition, the maximum strength, yield strength and fracture strain are, 2562 MPa, 2128 MPa, 8.16%, respectively.

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Section: Phase and Microstructure Of The Bulk Rheasupporting

confidence: 61%

Section: Alloying Processmentioning

confidence: 99%

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A Novel Non-Equiatomic (W35Ta35Mo15Nb15)95Ni5 Refractory High Entropy Alloy with High Density Fabricated by Powder Metallurgical Process

Duan

Liu

et al. 2020

Metals

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“…1). The additional phases formation can be expected since Ti and Nb are known to be bcc phase stabilizers in RHEAs [2,43], while Al is a compound former, at least in certain combinations of elements [43][44][45]. However, no experimental information on the effect of Ni on the structure and properties of RHEAs was available before.…”

Section: Phase Composition and Microstructure Of The Ti-nb-cr-v-ni-al Alloysmentioning

confidence: 99%

Structures and mechanical properties of Ti-Nb-Cr-V-Ni-Al refractory high entropy alloys

Panina

Yurchenko

Zherebtsov

et al. 2020

Materials Science and Engineering: A

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Four refractory high entropy alloys with different chemical compositions, which can be calculated as Ti (50-1.5625x) Nb (30-0.9375x) Cr 10 V 10 Ni 1.5x Al x (x ¼ 0, 5, 7, 10), were prepared by arc melting to determine the effect of Ni and Al on the phase composition, structure and mechanical properties. Each alloy was studied in both the as-cast and annealed at 1000 � C for 24 h conditions; compression tests at room temperature or at 800 � C was used to examine mechanical behavior of the alloys and the effect of deformation on microstructure. The replacement of Ti and Nb with Al and Ni resulted in the formation of the Ti, Ni-rich σ-phase and Ti 2 Ni phases in the bcc matrix in contrast to the ThermoCalc predictions which suggests the formation of the bcc solid solution, B2, and Laves phases. The Ti, Ni-rich σ-phase can't also be expected from the analysis of the corresponding binary and ternary phase diagrams. Annealing did not result in noticeable changes in the microstructure. The formation of the σ and Ti 2 Ni phases resulted in a considerable increase in strength (from 745 to 1600 MPa) and decrease in ductility (from a thickness reduction �50% to fracture in the elastic region) at room temperature. An increase in the testing temperature to 800 � C resulted in softening to and a substantial increase in ductility of all the alloys. Complex relationships between the fraction of the second phases and mechanical properties were discussed.

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“…However, most of bcc/B2 RHEAs are brittle since the B2 phase is a continuous matrix with bcc precipitates [12,13]. Only some RHEAs can have a ductile bcc matrix with embedded B2 strengthening particles after proper treatment [14,15].…”

Section: Introductionmentioning

confidence: 99%

A new refractory Ti-Nb-Hf-Al high entropy alloy strengthened by orthorhombic phase particles

Yurchenko

Panina

Tikhonovsky

et al. 2020

International Journal of Refractory Metals and Hard Materials

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This study reports the structure and mechanical properties of a new refractory Ti 40 Nb 30 Hf 15 Al 15 (at.%) high entropy alloy. The alloy was fabricated by vacuum arc melting and had a density of 7.07 ± 0.03 g/cm 3 . After annealing at 1200°C for 24 h, the alloy possessed a single-phase B2 structure. Further annealing at 600°C for 24 h resulted in the formation of Widmanstatten (Ti, Al)-rich orthorhombic particles (O-phase) in a bcc matrix. The single-phase B2 alloy demonstrated high (> 50%) compressive ductility and a pronounced work hardening capacity. The precipitation of the O-phase particles led to a 50% strength increment at 22 and 600°C, with some sacrificing in the compressive ductility at 22°C. The obtained results suggest new approaches to the development of precipitation-strengthened refractory high entropy alloys with a balanced combination of the room-and hightemperature properties.

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Precipitation behaviour and mechanical properties of a novel Al0.5MoTaTi complex concentrated alloy

Cited by 18 publications

References 23 publications

A Novel Non-Equiatomic (W35Ta35Mo15Nb15)95Ni5 Refractory High Entropy Alloy with High Density Fabricated by Powder Metallurgical Process

A Novel Non-Equiatomic (W35Ta35Mo15Nb15)95Ni5 Refractory High Entropy Alloy with High Density Fabricated by Powder Metallurgical Process

Structures and mechanical properties of Ti-Nb-Cr-V-Ni-Al refractory high entropy alloys

A new refractory Ti-Nb-Hf-Al high entropy alloy strengthened by orthorhombic phase particles

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