Microstructure characteristics and mechanical properties of Hf0.5Mo0.5NbTiZr refractory high entropy alloy with Cr addition

Gao, Xujie; Wang, Li; Guo, Nana; Luo, Laihui; Zhu, Guangming; Shi, Chengcheng; Su, Yanqing; Guo, Jingjie

doi:10.1016/j.ijrmhm.2020.105405

Cited by 37 publications

(4 citation statements)

References 24 publications

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“…Several previous studies have revealed that Cr alloying in bcc RHEAs may strengthen the alloys instead of degrading their good mechanical properties. [21][22][23][24][25][26][27] Wang et al 28 replaced Nb, Ti and Zr, respectively, with Cr and observed that a Laves phase emerged regardless of which element was substituted by Cr and a signicant enhancement in strength was achieved in all cases. Similar phenomena were also observed by Fazakas et al 29 (TiZrHfNbCr) and Yan et al 30 (WMoNbTiCr).…”

Section: Introductionmentioning

confidence: 99%

Synergy of strength–ductility in HfMoTaTiZr refractory high entropy alloy through Cr addition

Bai,

Xiao,

Wang

et al. 2024

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Synergy of strength–ductility in HfMoTaTiZr refractory high entropy alloy through Cr addition

Bai,

Xiao,

Wang

et al. 2024

RSC Adv.

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“…According to the open literatures [13,14], the additions of Si and Cr elements promote the formation of silicides and Laves phase respectively, thus leading to the obviously increased mechanical properties at high temperature by second phase strengthening. However, the effects of Si and Cr on the oxidation resistance of RHEA rarely have been studied.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of refractory high entropy alloys containing Si and Cr

Zhang

2023

Materials Science and Technology

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Mo0.5NbHf0.5ZrTiAl, Mo0.5NbHf0.5ZrTiSi0.5Al and Mo0.5NbHf0.5CrZrTiAl (molar ratio) refractory high entropy alloys (RHEA) were prepared by vacuum arc melting. The influences of Si and Cr on microstructure and properties of RHEA were investigated. Three RHEA all contain BCC1 phase. Si addition promotes the formation of M5Si3 intermetallic compound, and the microstructure of Si0.5Cr0 RHEA consists of M5Si3 blocks and BCC1 + M5Si3 eutectics. Cr addition leads to the formation of Cr2Nb type Laves phase, and two BCC dendrites exist in Si0Cr RHEA. The compressive strength of Si0.5Cr0 and Si0Cr RHEA increased by about 102% and 85%, respectively, compared to Si0Cr0 one. The oxidation resistance of RHEA is improved by adding Si while dramatically degraded by adding Cr.

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“…However, the most commonly used high-temperature structural material, nickel-based superalloy, has its own melting point of about 1300 °C, which limits the maximum operating temperature 2 , 3 . Thus, it is very important that the material has a high enough melting point 4 . High entropy alloys (HEAs), also known as multi-principal-element alloys (MPEAs), are composed of major element types more than four 5 .…”

Section: Introductionmentioning

confidence: 99%

How atoms of polycrystalline Nb20.6Mo21.7Ta15.6W21.1V21.0 refractory high-entropy alloys rearrange during the melting process

Shih

2022

Sci Rep

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The melting mechanism of single crystal and polycrystalline Nb20.6Mo21.7Ta15.6W21.1V21.0 refractory high entropy alloys (RHEAs) were investigated by the molecular dynamics (MD) simulation using the second-nearest neighbor modified embedded-atom method (2NN MEAM) potential. For the single crystal RHEA, the density profile displays an abrupt drop from 11.25 to 11.00 g/cm3 at temperatures from 2910 to 2940 K, indicating all atoms begin significant local structural rearrangement. For polycrystalline RHEAs, a two-stage melting process is found. In the first melting stage, the melting of the grain boundary (GB) regions firstly occurs at the pre-melting temperature, which is relatively lower than the corresponding system-melting point. At the pre-melting temperature, most GB atoms have enough kinetic energies to leave their equilibrium positions, and then gradually induce the rearrangement of grain atoms close to GB. In the second melting stage at the melting point, most grain atoms have enough kinetic energies to rearrange, resulting in the chemical short-ranged order changes of all pairs.

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Microstructure characteristics and mechanical properties of Hf0.5Mo0.5NbTiZr refractory high entropy alloy with Cr addition

Cited by 37 publications

References 24 publications

Synergy of strength–ductility in HfMoTaTiZr refractory high entropy alloy through Cr addition

Synergy of strength–ductility in HfMoTaTiZr refractory high entropy alloy through Cr addition

Microstructure and properties of refractory high entropy alloys containing Si and Cr

How atoms of polycrystalline Nb20.6Mo21.7Ta15.6W21.1V21.0 refractory high-entropy alloys rearrange during the melting process

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