An AlNbTiVZr0.5 high-entropy alloy combining high specific strength and good ductility

Stepanov, Nikita; Yurchenko, N.; Sokolovsky, V. S.; Tikhonovsky, М.А.; Салищев, Г. А.

doi:10.1016/j.matlet.2015.08.099

Cited by 126 publications

(36 citation statements)

References 17 publications

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“…In spite of the compositional complexity, the number of phases observed in these alloys does not generally exceed two or three, with the BCC solid-solution typically being the primary phase. RHEAs with a low density and high strength are among the most promising recent achievements in this field [19][20][21][22][23]. In particular, the density of these new alloys is in the range of 5.9 to 8.4 g/cm 3 and their specific strengths are often superior to Ni-based superalloys [19,23].…”

Section: Introductionmentioning

confidence: 99%

“…RHEAs with a low density and high strength are among the most promising recent achievements in this field [19][20][21][22][23]. In particular, the density of these new alloys is in the range of 5.9 to 8.4 g/cm 3 and their specific strengths are often superior to Ni-based superalloys [19,23]. Recent studies indicate that some of these alloys consist of very fine, nano-scale mixtures of two BCC phases with similar lattice parameters, which may be responsible for their high strengths [19].…”

Section: Introductionmentioning

confidence: 99%

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Development of a Refractory High Entropy Superalloy

Senkov

Isheim

Seidman

et al. 2016

Entropy

249

101

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Microstructure, phase composition and mechanical properties of a refractory high entropy superalloy, AlMo 0.5 NbTa 0.5 TiZr, are reported in this work. The alloy consists of a nano-scale mixture of two phases produced by the decomposition from a high temperature body-centered cubic (BCC) phase. The first phase is present in the form of cuboidal-shaped nano-precipitates aligned in rows along <100>-type directions, has a disordered BCC crystal structure with the lattice parameter a 1 = 326.9˘0.5 pm and is rich in Mo, Nb and Ta. The second phase is present in the form of channels between the cuboidal nano-precipitates, has an ordered B2 crystal structure with the lattice parameter a 2 = 330.4˘0.5 pm and is rich in Al, Ti and Zr. Both phases are coherent and have the same crystallographic orientation within the former grains. The formation of this modulated nano-phase structure is discussed in the framework of nucleation-and-growth and spinodal decomposition mechanisms. The yield strength of this refractory high entropy superalloy is superior to the yield strength of Ni-based superalloys in the temperature range of 20˝C to 1200˝C.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a Refractory High Entropy Superalloy

Senkov

Isheim

Seidman

et al. 2016

Entropy

249

101

View full text Add to dashboard Cite

show abstract

“…Many alloys with attractive properties, such as high room temperature strength [3][4][5], extraordinary fracture or impact toughness [6][7][8], and high wear resistance [9] were reported. One of the particularly attractive properties, demonstrated by some HEAs, is a high strength at elevated temperatures, which makes them promising materials for high-temperature applications, which are required in, for example, aerospace industry [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Many of the alloys also contain other elements, for example, Al [13][14][15][25][26][27][28][29][30][31][32][33]. The addition of Al has beneficial effects including: (i) reduction of density [25,27,28]; (ii) increase of strength both at room and elevated temperatures [14,25,26,28]; and (iii) increased oxidation resistance [31].…”

Section: Introductionmentioning

confidence: 99%

Phase Evolution of the AlxNbTiVZr (x = 0; 0.5; 1; 1.5) High Entropy Alloys

Yurchenko

Stepanov

Tikhonovsky

et al. 2016

Metals

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Al x NbTiVZr (x = 0; 0.5; 1; 1.5) high entropy alloys were fabricated by vacuum arc melting and annealed at 1200 • C for 24 h. The NbTiVZr alloy had single body centered cubic (bcc) solid solution phase after annealing at 1200 • C, while, in the Al-containing alloys, C14 Laves and Zr 2 Al-type phases are found. The alloys were subjected to annealing at 800 • C and 1000 • C. It was shown that annealing temperature (800 • C or 1000 • C) weakly affected the produced phases but the Al content had pronounced effect on structure of the annealed alloys. The NbTiVZr alloy decomposed into bcc, Zr-rich hexagonal close-packed (hcp), and C15 Laves phases. In the Al 0.5 NbTiVZr alloy, the bcc matrix phase also decomposed into a mixture of bcc and C14 Laves phases. In the AlNbTiVZr alloy, annealing resulted in an increase of volume fraction of Zr 2 Al-type phase. Finally, in the Al 1.5 NbTiVZr alloy, formation of AlNb 2 -type phase was observed. The highest fraction of second phases appeared after annealing in the NbTiVZr alloy. It is demonstrated that the strong chemical affinity and high enthalpy of formation of intermetallic phases in Al-Zr atomic pair govern the intermetallic phase formation in the alloys at 1200 • C. Increase of volume fraction of second phases in the alloys due to annealing at 800 • C and 1000 • C is in proportion to the decrease of Zr concentration in the bcc matrix phase.

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“…Therefore, these alloys have great potential in high temperature applications. Many other refractory HEAs were developed later to obtain improved strength, room temperature ductility, and density [40,41,[47][48][49][50][51][52][53][54]. For example, Al addition in certain systems can bring advantages such as higher hardness and high-temperature strength, better room temperature plasticity, and lower density [48].…”

Section: Refractory Heasmentioning

confidence: 99%

Three Strategies for the Design of Advanced High-Entropy Alloys

Tsai

2016

Entropy

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High-entropy alloys (HEAs) have recently become a vibrant field of study in the metallic materials area. In the early years, the design of HEAs was more of an exploratory nature. The selection of compositions was somewhat arbitrary, and there was typically no specific goal to be achieved in the design. Very recently, however, the development of HEAs has gradually entered a different stage. Unlike the early alloys, HEAs developed nowadays are usually designed to meet clear goals, and have carefully chosen components, deliberately introduced multiple phases, and tailored microstructures. These alloys are referred to as advanced HEAs. In this paper, the progress in advanced HEAs is briefly reviewed. The design strategies for these materials are examined and are classified into three categories. Representative works in each category are presented. Finally, important issues and future directions in the development of advanced HEAs are pointed out and discussed.

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An AlNbTiVZr0.5 high-entropy alloy combining high specific strength and good ductility

Cited by 126 publications

References 17 publications

Development of a Refractory High Entropy Superalloy

Development of a Refractory High Entropy Superalloy

Phase Evolution of the AlxNbTiVZr (x = 0; 0.5; 1; 1.5) High Entropy Alloys

Three Strategies for the Design of Advanced High-Entropy Alloys

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