Phase evolution of CoCrCuFeNiSi<sub>x</sub> high-entropy alloys prepared by mechanical alloying and spark plasma sintering

Kumar, Anil; Dhekne, Pushkar Prakash; Swarnakar, Akhilesh Kumar; Chopkar, Manoj

doi:10.1088/2053-1591/aaed63

Cited by 17 publications

(7 citation statements)

References 46 publications

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“…At present, powder metallurgy, vacuum melting and mechanical alloying are the most commonly used methods to prepare high-entropy alloys. Kumar et al [9] prepared the phase evolution and properties of CoCrCuFeNiSi x (x = 0, 0.3, 0.6 and 0.9 atomic ratios) high entropy alloys prepared by a powder metallurgy route is investigated. The X-ray diffraction analysis reveals the presence of mixed phases of the face-centered and body-centered cubic phase after 20 h of milling.…”

Section: Introductionmentioning

confidence: 99%

Laser-Ignited Self-Propagating Sintering of AlCrFeNiSi High-Entropy Alloys: An Improved Technique for Preparing High-Entropy Alloys

Zhu

Jin

et al. 2019

Metals

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AlCrFeNiSi system porous high-entropy alloy material is manufactured by laser ignition and self-propagating sintering of natural chromite powder, which provides the idea of breaking the traditional synthesis procedure of high-entropy alloy compound material. The raw material powder obtained by ball milling is compacted into cylindrical compacts, and the self-propagating reaction comes from the ignition caused by the laser on the surface of compacts, the high-entropy alloy composite of chrome iron powder synthesized by laser sintering, is obtained as well. The raw material is prepared from Al, Cr, Fe, Ni and Si elements with similar effective components of natural chromite powder. The selected chromite powder is energy-saving and environment-friendly, so the preparation of high-entropy alloy by the low-cost short-process can be made for processing for pre-theoretical reserve and process design. The effect of Si content on microstructure and properties of AlCrFeNiSi high-entropy alloy is investigated.

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Section: Introductionmentioning

confidence: 99%

Laser-Ignited Self-Propagating Sintering of AlCrFeNiSi High-Entropy Alloys: An Improved Technique for Preparing High-Entropy Alloys

Zhu

Jin

et al. 2019

Metals

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“…The phase fraction of a given phase was estimated using Eq. ( 17 ) given by Kumar et al 31 . where is the volume fraction of the k th phase, and is the integrated intensity of the ( h k , k k , l k ) plane.…”

Section: Methodsmentioning

confidence: 94%

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Sharma

Ahn

2021

Sci Rep

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In this work, we studied the brazing characteristics of Al2O3 and 3D printed Ti–6Al–4V alloys using a novel equiatomic AlZnCuFeSi high entropy alloy filler (HEAF). The HEAF was prepared by mechanical alloying of the constituent powder and spark plasma sintering (SPS) approach. The filler microstructure, wettability and melting point were investigated. The mechanical and joint strength properties were also evaluated. The results showed that the developed AlZnCuFeSi HEAF consists of a dual phase (Cu–Zn, face-centered cubic (FCC)) and Al–Fe–Si rich (base centered cubic, BCC) phases. The phase structure of the (Cu–Al + Ti–Fe–Si)/solid solution promises a robust joint between Al2O3 and Ti–6Al–4V. In addition, the joint interfacial reaction was found to be modulated by the brazing temperature and time because of the altered activity of Ti and Zn. The optimum shear strength reached 84 MPa when the joint was brazed at 1050 °C for 60 s. The results can be promising for the integration of completely different materials using the entropy driven fillers developed in this study.

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“…Taking advantage of joule heating, spark discharge, and electric field of spark plasma sintering, large driving forces are applied to accelerate homogenous diffusion of alloy elements and atomic rearrangement in HEAs 138. Chopkar et al prepared CoNiFeCrAl 0.6 Ti 0.4 HEA via two‐step methods: mechanical alloying and spark plasma sintering 139. Owing to that the pretreatment of mechanical alloying introduced high dislocation density and a large volume fraction of grain boundaries, the HEA stored a significant amount of energy.…”

Section: Phase Engineering Of Heasmentioning

confidence: 99%

“…[138] Chopkar et al prepared CoNiFeCrAl 0.6 Ti 0.4 HEA via two-step methods: mechanical alloying and spark plasma sintering. [139] Owing to that the pretreatment of mechanical alloying introduced high dislocation density and a large volume fraction of grain boundaries, the HEA stored a significant amount of energy. The excess stored energy decreased the activation energy of the phase evolution, which promoted the metastable supersaturated BCC phase to convert into equilibrium FCC and σ phase when providing enough external driving force of Adv.…”

Section: Othersmentioning

confidence: 99%

Phase Engineering of High‐Entropy Alloys

et al. 2020

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High‐entropy alloys (HEAs) are based on five or more principal elements with equal or nearly equal molar fractions and possess many significant advantages over traditional alloys, including high strength and hardness, excellent corrosion resistance, outstanding thermal stability, and irradiation resistance. Phase structure plays a vital role in determining the property of HEAs. For further enhancing the performance of HEAs in various application fields, a controllable synthesis with desired phases is required. In this review, the diverse phase structures of HEAs and the related properties are first introduced. Then, alternative tuning strategies to promote the desired phase structure of HEAs are focused upon. Property adjusting of phase‐engineered HEAs is also discussed in depth. Lastly, some insights into the challenges and future prospects in this rapidly emerging research field are provided.

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Phase evolution of CoCrCuFeNiSi_x high-entropy alloys prepared by mechanical alloying and spark plasma sintering

Cited by 17 publications

References 46 publications

Laser-Ignited Self-Propagating Sintering of AlCrFeNiSi High-Entropy Alloys: An Improved Technique for Preparing High-Entropy Alloys

Laser-Ignited Self-Propagating Sintering of AlCrFeNiSi High-Entropy Alloys: An Improved Technique for Preparing High-Entropy Alloys

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Phase Engineering of High‐Entropy Alloys

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Phase evolution of CoCrCuFeNiSix high-entropy alloys prepared by mechanical alloying and spark plasma sintering

Cited by 17 publications

References 46 publications

Laser-Ignited Self-Propagating Sintering of AlCrFeNiSi High-Entropy Alloys: An Improved Technique for Preparing High-Entropy Alloys

Laser-Ignited Self-Propagating Sintering of AlCrFeNiSi High-Entropy Alloys: An Improved Technique for Preparing High-Entropy Alloys

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Phase Engineering of High‐Entropy Alloys

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Phase evolution of CoCrCuFeNiSi_x high-entropy alloys prepared by mechanical alloying and spark plasma sintering