Electrochemical deposition and microstructural characterization of AlCrFeMnNi and AlCrCuFeMnNi high entropy alloy thin films

2015 ◽  
Vol 358 ◽  
pp. 533-539 ◽  
Author(s):  
V. Soare ◽  
M. Burada ◽  
I. Constantin ◽  
D. Mitrică ◽  
V. Bădiliţă ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrochemical Deposition ◽  
Microstructural Characterization ◽  
High Entropy Alloy ◽  
High Entropy

Synthesis and microstructural characterization of a novel multicomponent equiatomic ZrNbAlTiV high entropy alloy

2016 ◽  
Vol 124 ◽  
pp. 146-150 ◽  
Author(s):  
B. Vishwanadh ◽  
N. Sarkar ◽  
S. Gangil ◽  
S. Singh ◽  
R. Tewari ◽  
...  
Keyword(s):  
Microstructural Characterization ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Microstructural Characterization of AlCrTiV – Si High Entropy Alloy for advanced applications

2021 ◽  
Vol 349 ◽  
pp. 02003
Author(s):  
Ioannis Daskalopoulos ◽  
Spyridon Chaskis ◽  
Marianthi Bouzouni ◽  
Pavlos Stavroulakis ◽  
Russell Goodall ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Microstructural Characterization ◽  
High Entropy Alloy ◽  
Strength Increase ◽  
Worst Case ◽  
High Entropy ◽  
Heat Treated ◽  
The Matrix ◽  
Advanced Applications

This work deals with the microstructural characterization of two equiatomic high-entropy, low-density alloys (HEA), the AlCrTiV and AlCrTiV-Si7.2. These alloys can serve as potential candidates for advanced applications where high strength and enhanced ductility is demanded. For ensuring high ductility the alloys must contain as minimum as possible hard precipitates. As the strength increase is based on both solid solution and precipitation hardening, the laboratory made alloys were investigated in as-cast and heat-treated conditions. For the heat treatment a high soaking temperature of 1200°C for 8 hours was selected to ensure microstructure homogenization. Micrographic observations of the AlCrTiV and AlCrTiV-Si7.2 samples in the as-cast condition indicated the presence of a dendritic microstructure. Furthermore, chemical micro-analysis showed segregation in the matrix in both samples. This is a critical result as this segregation will lead to heavy precipitation at interdendritic regions, it may sensitize these regions and in the worst-case scenario may cause cleavage fracture in the micro scale, which can trigger brittle fracture during cooling even without the application of deformation. However, the selected heat treatment eliminated the segregation phenomena forcing the alloying elements to be uniformly distributed in the matrix. At the center of the heat-treated AlCrTiV-Si7.2 sample the fragmentation and spheroidization of the intermetallic phase Ti5Si3 was observed. For the same sample, at the mold-sample’s interface, the particles Ti5Si3 were shown to dissolve and form aggregates. Both alloys exhibited high hardness values with small differences between the as-cast and heat-treated conditions, which indicates that the AlCrTiV–Si7.2 high entropy alloy presents high yield strength and may operate at high temperatures without deterioration of the mechanical properties nor unexpected failure.

Structural and Microstructural Characterization of CoCrFeNiPd High Entropy Alloys

2016 ◽  
Vol 257 ◽  
pp. 72-75 ◽  
Author(s):  
Monique Calvo-Dahlborg ◽  
Juan Cornide ◽  
Ulf Dahlborg ◽  
Sylvain Chambreland ◽  
Gareth D. Hatton ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Microstructural Characterization ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Equimolar Composition

According to literature, a High Entropy Alloy (HEA) has close to equimolar composition and forms mostly fcc and/or bcc phases as well as solid solutions, i.e. the elements take random occupations on available lattice sites. In this paper we report studies on HEAs of the CoCrFeNiPd system. All alloys have been found to, contrary to what has been reported earlier in literature, consist of four different phases, three of them of fcc type. The relative amounts of the different phases depend on Pd concentration. The different phases seem to be fully interconnected.

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

2019 ◽  
Vol 22 (4) ◽  
pp. 1901311 ◽  
Author(s):  
Fatemeh Alijani ◽  
Mohsen Reihanian ◽  
Khalil Gheisari ◽  
Motohiro Yuasa ◽  
Hiroyuki Miyamoto
Keyword(s):  
Spark Plasma Sintering ◽  
Microstructural Characterization ◽  
High Entropy Alloy ◽  
Mechanically Alloyed ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals An advancement in the synthesis of unique soft magnetic CoCuFeNiZn high entropy alloy thin films

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chokkakula L. P. Pavithra ◽  
Reddy Kunda Siri Kiran Janardhana ◽  
Kolan Madhav Reddy ◽  
Chandrasekhar Murapaka ◽  
Joydip Joardar ◽  
...  
Keyword(s):  
Thin Films ◽  
Saturation Magnetization ◽  
Functional Materials ◽  
Single Step ◽  
High Entropy Alloy ◽  
High Saturation Magnetization ◽  
Soft Magnetic ◽  
High Entropy ◽  
High Saturation ◽  
Electrochemical Approach

AbstractDiscovery of advanced soft-magnetic high entropy alloy (HEA) thin films are highly pursued to obtain unidentified functional materials. The figure of merit in current nanocrystalline HEA thin films relies in integration of a simple single-step electrochemical approach with a complex HEA system containing multiple elements with dissimilar crystal structures and large variation of melting points. A new family of Cobalt–Copper–Iron–Nickel–Zinc (Co–Cu–Fe–Ni–Zn) HEA thin films are prepared through pulse electrodeposition in aqueous medium, hosts nanocrystalline features in the range of ~ 5–20 nm having FCC and BCC dual phases. The fabricated Co–Cu–Fe–Ni–Zn HEA thin films exhibited high saturation magnetization value of ~ 82 emu/g, relatively low coercivity value of 19.5 Oe and remanent magnetization of 1.17%. Irrespective of the alloying of diamagnetic Zn and Cu with ferromagnetic Fe, Co, Ni elements, the HEA thin film has resulted in relatively high saturation magnetization which can provide useful insights for its potential unexplored applications.

scholarly journals Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3071
Author(s):  
Andri Isak Thorhallsson ◽  
Francesco Fanicchia ◽  
Emily Davison ◽  
Shiladitya Paul ◽  
Svava Davidsdottir ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Microstructural Characterization ◽  
Corrosion Damage ◽  
Process Equipment ◽  
High Entropy Alloy ◽  
Low Alloy Steels ◽  
Manufacturing Defects ◽  
High Entropy ◽  
Alloy Steels ◽  
Resistance Performance

Geothermal process equipment and accessories are usually manufactured from low-alloy steels which offer affordability but increase the susceptibility of the materials to corrosion. Applying erosion-corrosion-resistant coatings to these components could represent an economical solution to the problem. In this work, testing of two newly developed laser metal deposited high-entropy alloy (LMD-HEA) coatings—CoCrFeNiMo0.85 and Al0.5CoCrFeNi, applied to carbon and stainless steels—was carried out at the Hellisheidi geothermal power plant. Tests in three different geothermal environments were performed at the Hellisheidi site: wellhead test at 194 °C and 14 bar, erosion test at 198 °C and 15 bar, and aerated test at 90 °C and 1 bar. Post-test microstructural characterization was performed via Scanning Eletron Microscope (SEM), Back-Scattered Electrons analysis (BSE), Energy Dispersive X-ray Spectroscopy (EDS), optical microscopy, and optical profilometry while erosion assessment was carried out using an image and chemical analysis. Both the CoCrFeNiMo0.85 and Al0.5CoCrFeNi coatings showed manufacturing defects (cracks) and were prone to corrosion damage. Results show that damage in the CoCrFeNiMo0.85-coated carbon steel can be induced by manufacturing defects in the coating. This was further confirmed by the excellent corrosion resistance performance of the CoCrFeNiMo0.85 coating deposited onto stainless steel, where no manufacturing cracks were observed.

Electrochemical deposition and characterization of SnS thin films

2010 ◽  
Vol 15 (4) ◽  
pp. 683-688 ◽  
Author(s):  
Medhat M. Kamel ◽  
Mervat Mohamed Ibrahim
Keyword(s):  
Thin Films ◽  
Electrochemical Deposition ◽  
Sns Thin Films

scholarly journals Synthesis and Microstructural Characterization of SnO2:F Thin Films Deposited by AACVD

2016 ◽  
Vol 19 (suppl 1) ◽  
pp. 97-102 ◽  
Author(s):  
Karen Alejandra Chavarría-Castillo ◽  
Patricia Amézaga-Madrid ◽  
Oswaldo Esquivel-Pereyra ◽  
Wilber Antúnez-Flores ◽  
Pedro Pizá Ruiz ◽  
...  
Keyword(s):  
Thin Films ◽  
Microstructural Characterization
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