High entropy alloys (HEAs) are multi-elemental alloy systems that exhibit a combination of exceptional mechanical and physical properties, and nowadays are validating their potential in the form of thermal sprayed coatings. In the present study, a novel synthesis method is presented to form high entropy alloy coatings. For this purpose, thermal sprayed coatings were deposited on Stainless Steel 316L substrates using atmospheric plasma spraying technique with subsequent annealing, at 1000 °C for 4 h, to assist alloy formation by thermal diffusion. The coatings in as-coated samples as well as in annealed forms were extensively studied by SEM for microstructure and cross-sectional analysis. Phase identification was performed by X-ray diffraction studies. The annealed coatings revealed a mixed BCC and FCC based HEA structure. Potentiodynamic corrosion behavior of SS316L sprayed as well as annealed coatings were also carried out in 3.5% NaCl solution and it was found that the HEA-based annealed coatings displayed the best corrosion resistance 0.83 (mpy), as compared to coated/non-annealed and SS 316 L that showed corrosion resistance of 7.60 (mpy) and 3.04 (mpy), respectively.
This comprehensive review article discusses the potential applications of graphene oxide-silver nanoparticles (GO-Ag NPs) in various fields, including biomedical, catalytic, electrochemical detection, and wastewater treatment technologies. GO-Ag NPs have gained significant attention due to their unique properties, such as excellent electrical, mechanical, and thermal conductivity, as well as their protective capabilities. The review summarizes the different starting materials and reducing agents that have been used to produce GO-Ag NPs with particle sizes ranging from 2 to 90 nm. Furthermore, the article highlights the various applications of GO-Ag NPs, such as their use in drug delivery, bioimaging, and cancer therapy. Additionally, the review discusses the potential of GO-Ag NPs in catalysis, electrochemical detection, and wastewater treatment. Overall, this review provides a comprehensive overview of the potential uses of GO-Ag NPs and emphasizes the need for further research to develop more straightforward methods for their production and application.
Austenitic stainless steel with submicron gain size has been attracted due to fine structural control of mechanical properties. In order to achieve a submicron grain size, meta-stable austenitic steel AISI 304 is severely cold deformed and then annealed to different heat treatment cycles. The heat treated samples were then tested for metallurgical phase change, texture components and hardness. It was observed that at 750°C, all the martensite transformed completely into austenite. Further, at the same temperature, it was observed that the texture component {221}<232> was the dominant texture component.
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