Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Kang, Minju; Lim, Ka Ram; Won, Jong Woo; Lee, Kwang Seok; Na, Young Sang

doi:10.3390/e20050355

Cited by 26 publications

(10 citation statements)

References 30 publications

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“…1.137 × G 0.708 where K = G/B. The calculated H v of Al 20 Cr 20 Mo 20 Ti 20 V 20 is 5.48 GPa while the experimentally measured H v value of Al 20 Cr 20 Mo 20 Ti 20 V 20 is 5.55 GPa[8]. The excellent agreement of calculated hardness with the experimental result confirms the reliability of our predicted value of bulk modulus and shear modulus.…”

supporting

confidence: 81%

“…These reports show that while they have excellent mechanical properties, they also have high density. Ideally, the structural components of aircraft engines need low-density materials with high toughness and a high melting temperature, which motivates researchers in trying titanium-mixed refractory high-entropy alloys (RHEAs) [6][7][8]. RHEAs have attracted the interest of researchers due to their excellent mechanical property, high melting point, hardness, ductility, wear resistance, and high-temperature strength [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…However, this alloy has a low melting point which is not appropriate for high-temperature applications. Kang et al [8] prepared an equimolar low-density RHEA AlCrMoTiV. They found a single body-centered cubic (BCC) phase in AlCrMoTiV using the X-ray diffraction (XRD) method.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Thermal Properties of Low-Density Al20+xCr20-xMo20-yTi20V20+y Alloys

2020

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Refractory high-entropy alloys (RHEAs) Al20+xCr20-xMo20-yTi20V20+y ((x, y) = (0, 0), (0, 10), and (10, 15)) were computationally studied to obtain a low density and a better mechanical property. The density functional theory (DFT) method was employed to compute the structural and mechanical properties of the alloys, based on a large unit cell model of randomly distributed elements. Debye–Grüneisen theory was used to study the thermal properties of Al20+xCr20-xMo20-yTi20V20+y. The phase diagram calculation shows that all three RHEAs have a single body-centered cubic (BCC) structure at high temperatures ranging from 1000 K to 2000 K. The RHEA Al30Cr10Mo5Ti20V35 has shown a low density of 5.16 g/cm3 and a hardness of 5.56 GPa. The studied RHEAs could be potential candidates for high-temperature application materials where high hardness, ductility, and low density are required.

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supporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Mechanical and Thermal Properties of Low-Density Al20+xCr20-xMo20-yTi20V20+y Alloys

2020

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“…Many studies on HEAs were motivated by the possibility that properties may be tunable based on the elements contained in the HEAs. For example, Al-based HEAs [ 10 , 11 , 12 , 13 ] were studied for application on aircraft engines and nuclear reactors because of their low densities. On the other hand, because of the high melting temperature and high hardness of W and Re, HEAs that contained W or Re were expected to maintain advanced mechanical properties for high-temperature applications [ 5 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Carbide Formation in Refractory Mo15Nb20Re15Ta30W20 Alloy under a Combined High-Pressure and High-Temperature Condition

Zhang

Bhandari

Zeng

et al. 2020

Entropy

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In this work, the formation of carbide with the concertation of carbon at 0.1 at.% in refractory high-entropy alloy (RHEA) Mo15Nb20Re15Ta30W20 was studied under both ambient and high-pressure high-temperature conditions. The x-ray diffraction of dilute carbon (C)-doped RHEA under ambient pressure showed that the phases and lattice constant of RHEA were not influenced by the addition of 0.1 at.% C. In contrast, C-doped RHEA showed unexpected phase formation and transformation under combined high-pressure and high-temperature conditions by resistively employing the heated diamond anvil cell (DAC) technique. The new FCC_L12 phase appeared at 6 GPa and 809 °C and preserved the ambient temperature and pressure. High-pressure and high-temperature promoted the formation of carbides Ta3C and Nb3C, which are stable and may further improve the mechanical performance of the dilute C-doped alloy Mo15Nb20Re15Ta30W20.

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“…Classical MPEAs are mostly based on the FeCoNiCrMn, resulting in an average density~8.1 g/cm 3 [6,7]. More attention has been paid to the development of low-density multi-principal element alloys (LD-MPEAs) for energy-saving reasons [8][9][10][11][12][13][14][15][16][17][18][19]. Some of them are still single-phase solid solutions [14][15][16] and some are in dual-phase structures, and most of their densities are above 5.0 g/cm 3 , except for Al 20 Li 20 Mg 10 Sc 20 Ti 30 [14].…”

Section: Introductionmentioning

confidence: 99%

Nano-Scaled Creep Response of TiAlV Low Density Medium Entropy Alloy at Elevated Temperatures

Zhang

Huang

et al. 2019

Materials

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A low density, medium entropy alloy (LD-MEA) Ti33Al33V34 (4.44 g/cm3) was successfully developed. The microstructure was found to be composed of a disordered body-centered-cubic (BCC) matrix and minor ordered B2 precipitates based on transmission electron microscopy characterization. Equilibrium and non-equilibrium modeling, simulated using the Calphad approach, were applied to predict the phase constituent. Creep behavior of {110} grains at elevated temperatures was investigated by nanoindentation and the results were compared with Cantor alloy and Ti-6Al-4V alloy. Dislocation creep was found to be the dominant mechanism. The decreasing trend of hardness in {110} grains of BCC TiAlV is different from that in {111} grains of face-centered-cubic (FCC) Cantor alloy due to the different temperature-dependence of Peierls stress in these two lattice structures. The activation energy value of {110} grains was lower than that of {111} grains in FCC Cantor alloy because of the denser atomic stacking in FCC alloys. Compared with conventional Ti-6Al-4V alloy, TiAlV possesses considerably higher hardness and specific strength (63% higher), 83% lower creep displacement at room temperature, and 50% lower creep strain rate over the temperature range from 500 to 600 °C under the similar 1150 MPa stress, indicating a promising substitution for Ti-6Al-4V alloy as structural materials.

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Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Cited by 26 publications

References 30 publications

Mechanical and Thermal Properties of Low-Density Al20+xCr20-xMo20-yTi20V20+y Alloys

Mechanical and Thermal Properties of Low-Density Al20+xCr20-xMo20-yTi20V20+y Alloys

Carbide Formation in Refractory Mo15Nb20Re15Ta30W20 Alloy under a Combined High-Pressure and High-Temperature Condition

Nano-Scaled Creep Response of TiAlV Low Density Medium Entropy Alloy at Elevated Temperatures

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