Search

Your search keyword '"Georgarakis, Konstantinos"' showing total 21 results
Start Over Author "Georgarakis, Konstantinos" Publisher elsevier bv
21 results on '"Georgarakis, Konstantinos"'

2. Structural pathways for ultrafast melting of optically excited thin polycrystalline Palladium films

Author

Antonowicz, Jerzy, primary, Olczak, Adam, additional, Sokolowski-Tinten, Klaus, additional, Zalden, Peter, additional, Milov, Igor, additional, Dzięgielewski, Przemysław, additional, Bressler, Christian, additional, Chapman, Henry N., additional, Chojnacki, Michał, additional, Dłużewski, Piotr, additional, Rodriguez-Fernandez, Angel, additional, Fronc, Krzysztof, additional, Gawełda, Wojciech, additional, Georgarakis, Konstantinos, additional, Greer, Alan L., additional, Jacyna, Iwanna, additional, van de Kruijs, Robbert W.E., additional, Kamiński, Radosław, additional, Khakhulin, Dmitry, additional, Klinger, Dorota, additional, Kosyl, Katarzyna M., additional, Kubicek, Katharina, additional, Migdal, Kirill P., additional, Minikayev, Roman, additional, Panagiotopoulos, Nikolaos T., additional, Sikora, Marcin, additional, Sun, Peihao, additional, Yousef, Hazem, additional, Zajkowska-Pietrzak, Wiktoria, additional, Zhakhovsky, Vasily V., additional, and Sobierajski, Ryszard, additional

Published
2024
Full Text
View/download PDF

5. Friction-induced phase transformations and evolution of microstructure of austenitic stainless steel observed by operando synchrotron X-ray diffraction

Author

Emurlaev, K., Bataev, I., Ivanov, I., Lazurenko, D., Burov, V., Ruktuev, A., Ivanov, D., Rosenthal, M., Burghammer, M., Georgarakis, Konstantinos, and Jorge Junior, A. M.

Subjects
Friction, Polymers and Plastics, Austenitic stainless steel, Metals and Alloys, Ceramics and Composites, Synchrotron X-ray diffraction, Operando, Peak profile analysis, Electronic, Optical and Magnetic Materials
Abstract

A materials’ structure and its evolution due to friction play a crucial role in understanding wear and related processes. So far, structural changes caused by friction are mostly studied using ex situ destructive characterization techniques, such as microscopy of post-mortem the prepared specimen by polishing and etching techniques. In this paper, the structural changes of AISI 321 austenitic stainless steel (ASS) during frictional loading were observed by the nondestructive operando method based on synchrotron X-ray diffraction (XRD). Although the martensitic transformation in AISI 321 steel starts at ca. -187 °C, frictional loading induces γ -(ε, α′) transformation in this alloy at room or even higher temperatures. The ε-martensite formation is observed only for a relatively short time. Subsequently, a mechanically-mixed layer (MML), composed mainly of the α′ phase, forms at the sample’s surface. Using XRD peak profile analysis, we observed the accumulation of dislocations, their ordering, and/or stress field shielding before and after phase transformations. The steady-state conditions are reached after ca. 69 friction cycles manifested in reaching the threshold values of the size of the coherent scattering regions (CSRs) and dislocation density in γ and α′ phases. For a better understanding of structural evolution, the microstructure of the sample was studied by scanning electron microscopy (SEM) after the experiment. The structure of the MML, its delamination, the formation of vortices, and carbide crushing are discussed.

Published
2022
Full Text
View/download PDF

6. Interaction between Fe66Cr10Nb5B19 metallic glass and aluminum during spark plasma sintering

Author

Dudina, Dina V., primary, Bokhonov, Boris B., additional, Batraev, Igor S., additional, Amirastanov, Yusif N., additional, Ukhina, Arina V., additional, Kuchumova, Ivanna D., additional, Legan, Mikhail A., additional, Novoselov, Aleksey N., additional, Gerasimov, Konstantin B., additional, Bataev, Ivan A., additional, Georgarakis, Konstantinos, additional, Koga, Guilherme Yuuki, additional, Guo, Yaofeng, additional, Botta, Walter José, additional, and Jorge, Alberto Moreira, additional

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results