Phase Evolution and Thermal Analysis of Nanocrystalline AlCrCuFeNiZn High Entropy Alloy Produced by Mechanical Alloying

Koundinya, N.T.B.N.; Babu, C. Sajith; Sivaprasad, K.; Susila, P.; Babu, N. Kishore; Baburao, J.

doi:10.1007/s11665-013-0580-5

Cited by 41 publications

(29 citation statements)

References 35 publications

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“…For example, the ternary or higher order intermetallic compounds, which form unexpectedly in multi-component alloys at elevated operating temperatures, include complex crystal structures that indicate a reduction in mechanical properties and microstructure stability. Recently, the process of microstructure formation during solid solution and solidification for HEAs with specially five components caused to stabilize solid solution like phases with simple crystal structures included FCC and/or BCC crystal structures rather than forming the complex intermetallic phases has been considerably investigated (Manzoni et al, 2013b;Koundinya et al, 2013). In spite of the complex composition of HEAs, their microstructure is simple which motivate researchers to explore, discover, and develop this new class of metallic materials possessing the high strength, light weight, and high temperature alloys characteristics for the future structural applications.…”

Section: Microstructurementioning

confidence: 99%

The microstructure and mechanical behavior of modern high temperature alloys

Samaei

Mirsayar²,

Aliha³

2015

10.5267/j.esm

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Over the past decades, high entropy alloys (HEAs) have attracted continuously increasing research efforts because of their technological promise for structural applications and their scientific interest as a multi-component alloy exhibiting an overall random solid solution structure with high mixing entropy at high temperature. In this summary, we briefly review the recent studies focused on the structure and mechanical behavior of HEAs, covering the important issues from phase stability to elastic modulus, mechanical strength, hardness and fatigue resistance. Finally, we highlight a few key findings recently reported for HEAs and discuss the outstanding issues yet to be resolved.

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Section: Microstructurementioning

confidence: 99%

The microstructure and mechanical behavior of modern high temperature alloys

Samaei

Mirsayar²,

Aliha³

2015

10.5267/j.esm

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“…Depending on the property required, e.g. hardness, corrosion resistance, etc., a particular phase in the multiphase alloy is targeted for a specific application [1][2][3]. Successful manufacture of bulk CCAs by using traditional casting techniques can prove challenging due to large differences in both density and melting point of individual constituent elements.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo0.85Ni Compositionally Complex Alloy Coatings

Fanicchia¹,

Csáki

Geambazu

et al. 2019

Coatings

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A compositionally complex alloy (CCA) was developed in powder form and applied as a coating onto a carbon steels substrate by using thermal spray. The purpose of this study was to investigate the effect of microstructural modification induced by using two different powder production methods, mechanical alloying and gas atomisation, onto the corrosion resistance of the coatings for a CoCrFeMo 0.85 Ni composition. The evolution of microstructure from powders to coatings was analysed using scanning electron microscopy coupled with energy-dispersive spectroscopy and X-ray diffraction. In order to evaluate the corrosion performance of the coatings, electrochemical corrosion tests were performed in a 3.5 wt % NaCl solution at pH = 4. The study demonstrates that the powder production method has a significant influence on the phase composition and, in turn, corrosion behaviour of the resulting coating, with the gas atomising route imparting better corrosion resistance properties. Nevertheless, the appearance of the face-centered cubic (FCC) phase characteristic of the CoCrFeMo 0.85 Ni alloy within the coating produced from the mechanically alloyed powder, opens the possibility for this powder manufacturing technique to effectively produce compositionally complex alloys.Coatings 2019, 9, 695 2 of 16 and consisted of Laves phase within an FCC solid solution. Elemental segregation was observed, with higher melting point elements (Cu, Nb) enriching the interdendritic regions. Better corrosion performance than previously studied coatings was measured in 3.5 wt % NaCl solution, with the Cu and Nb-rich regions representing the areas of preferential corrosion. In another work by Gao et al. [6], CCA of the CoCrFeNiAl 0.3 composition was produced by using radio frequency magnetron sputtering and tested in 3.5 wt % NaCl solution. The coatings consisted of a polycrystalline FCC structure with homogeneous element distribution and showed increased hardness and improved corrosion performance as compared to wrought 304 stainless steel. Some CCAs have demonstrated excellent performance in both H 2 SO 4 and NaCl solutions. Similar to conventional alloys, it is interesting to note that Cr, Ni, Co, Ti in CCAs enhance corrosion resistance in acid solutions, Mo tends to inhibit pitting corrosion, whereas Al and Mn display a negative effect [7]. Wang et al. [8] applied thermal spray technology to fabricate coatings of the Ni x Co 0.6 Fe 0.2 Cr y Si z AlTi 0.2 composition. Results indicated that the hardness of the CCAs prepared by using the thermal spraying in combination with annealing at 1100 • C for 10 h was significantly increased compared to that of the cast alloy. Moreover, the alloy exhibited excellent corrosion resistance, resulting from the presence of the Cr 3 Si phase and several other (unidentified) phases. More recently, the effect of grain refinement and elemental partitioning onto the strength and corrosion resistance of a friction stir processed Cu-containing CCA has been evaluated by Nene et al. [9]. Their work shows that grai...

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“…However, the MA process, in which the microstructure and properties of the powders can change significantly with the milling time, was not investigated in detail. Furthermore, lots of papers focused on the evolution of the particle size and the phase structure of HEA powders during mechanical alloying, but without a coating deposition [ 20 , 21 , 22 , 23 ]. In these papers, different alloy systems composed of common elements such as Al, Co, Cr, Cu, Fe, Mn, Ni, Ti, and Zn were chosen as the objects of study.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of AlCoCrFeNiSi High-Entropy Alloy Powder during Mechanical Alloying and Its Coating Performance

Tian

Xiong

2018

Materials

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High-entropy alloys (HEAs) are promising structural materials due to their excellent comprehensive performances. The use of mechanically alloyed powders to deposit HEA coatings through atmospheric plasma spraying (APS) is an effective approach that can broaden the application areas of the HEAs. In this paper, a ductility–brittleness AlCoCrFeNiSi system was chosen as an object of study, and the detailed evolution of the surface morphology, particle size distribution, and microstructure of the powder during mechanical alloying was investigated. An AlCoCrFeNiSi HEA coating was deposited using powder milled for 10 h, which can be used as an ideal feedstock for APS. The surface morphology, microstructure, microhardness, and wear behavior of the coating at room temperature were investigated. The results showed that as the milling time increased, the particle size first increased, and then decreased. At the milling time of 10 h, simple body-centered cubic (BCC) and face-centered cubic (FCC) solid solution phases were formed. After spraying, the lamellar structure inside a single particle disappeared. An ordered BCC phase was detected, and the diffraction peaks of the Si element also disappeared, which indicates that phase transformation occurred during plasma spraying. A transmission electron microscopy analysis showed that nanometer crystalline grains with a grain size of about 30 nm existed in the APS coating. For the coating, an average microhardness of 612 ± 41 HV was obtained. Adhesive wear, tribo-oxidation wear, and slight abrasion wear took place during the wear test. The coating showed good wear resistance, with a volume wear rate of 0.38 ± 0.08 × 10−4 mm3·N−1·m−1, which makes it a promising coating for use in abrasive environments.

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Phase Evolution and Thermal Analysis of Nanocrystalline AlCrCuFeNiZn High Entropy Alloy Produced by Mechanical Alloying

Cited by 41 publications

References 35 publications

The microstructure and mechanical behavior of modern high temperature alloys

The microstructure and mechanical behavior of modern high temperature alloys

Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo0.85Ni Compositionally Complex Alloy Coatings

Microstructural Evolution of AlCoCrFeNiSi High-Entropy Alloy Powder during Mechanical Alloying and Its Coating Performance

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