Gum-like mechanical behavior of a partially ordered Al5Nb24Ti40V5Zr26 high entropy alloy

Zherebtsov, Sergey; Yurchenko, N.; Panina, E.; Tikhonovsky, М.А.; Stepanov, Nikita

doi:10.1016/j.intermet.2019.106652

Cited by 41 publications

(20 citation statements)

References 50 publications

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“…Usually, RHEAs with such a structure suffer from brittleness at room temperature [28,29]. However, there are some examples of relatively ductile alloys with nearly a single-phase B2 structure [28,30,31]. The present study confirms that RHEAs with the B2 structure are not necessarily brittle.…”

Section: Discussionsupporting

confidence: 79%

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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Section: Discussionsupporting

confidence: 79%

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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“…Recently, another example of strain localization was also observed in an Al 5 Nb 24 Ti 40 V 5 Zr 26 HEA [23]. The alloy in a recrystallized condition had a partially (weakly) B2 ordered bcc matrix.…”

Section: Introductionmentioning

confidence: 83%

“…In contrast, superlattice dislocations in conditions with high S do not create wrong bonds behind, resulting in some decrease in strength as the proportion of superlattice dislocations increases [36,37]. In addition, in alloys with low S, (or with shortrange ordering) planar slip tends to delocalize, forming a thin 3D zone due to cross-slip of the screw components to adjacent prismatic planes [23,28,38] that can result in some increase in ductility. The presence of oxygen in the program alloy has possibly a somewhat similar influence on mechanical behavior due to the ZrO clusters formation, which might act as short-range order domains [15].…”

Section: Discussionmentioning

confidence: 99%

“…The authors declare that they have no known competing financial interests or personal relationships that could have [23,45] and TRIP Ti-rich HEAs [46e49], gum metals [12,15,21,50], and MBIP Ti alloys [14,51e55] on the BoÀ M d map.…”

Section: Data Availability Statementmentioning

confidence: 99%

“…The alloy in a recrystallized condition had a partially (weakly) B2 ordered bcc matrix. During deformation, the formation of dislocation channels was observed in the microstructure [23]; the formation of these channels was ascribed to the matrix disordering. As a result, the alloy showed a mechanical behavior typical of gum metals (high strength and ductility, and lack of work hardening).…”

Section: Introductionmentioning

confidence: 99%

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Microband-induced plasticity in a Ti-rich high-entropy alloy

Zherebtsov

Yurchenko

Panina

et al. 2020

Journal of Alloys and Compounds

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Microstructure evolution and mechanical behavior of an Al 4 Mo 4 Nb 8 Ti 50 Zr 34 high-entropy alloy were studied. In the as-cast condition, the alloy had a single-phase weakly B2 ordered bcc structure with a grain size of 100 ± 50 mm. The microstructure evolution during cold rolling to 90% thickness strain was initially associated with the development of substructure in the form of slip bands and then the formation of deformation bands propagating through several grains. Annealing of the cold-rolled alloy at T ! 700 C resulted in the formation of a recrystallized microstructure with grain sizes varying from 6 mm after annealing at 600 C to~250 mm at 1000 C. A small fraction of tiny oxides was observed in the alloy annealed at 700 C; the particles did not influence noticeably on the alloy properties. In spite of lack of work hardening in both the as-cast and recrystallized conditions, the alloy demonstrated the yield strength of 825e910 MPa and elongation to fracture of 11.5e15.2%. This behavior can be associated with strain localization due to the formation of dislocation microbands in the weakly B2 ordered bcc matrix.

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Superconductivity, Hardness, and Materials Design of Body-Centered Cubic High-Entropy Alloys

Kitagawa,

Mizuguchi,

Nishizaki

2024

Springer Series in Solid-State Sciences

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Gum-like mechanical behavior of a partially ordered Al5Nb24Ti40V5Zr26 high entropy alloy

Cited by 41 publications

References 50 publications

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

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

Microband-induced plasticity in a Ti-rich high-entropy alloy

Superconductivity, Hardness, and Materials Design of Body-Centered Cubic High-Entropy Alloys

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