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Browsing by Author "Georgarakis, Konstantinos"

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Advanced ultra-light multifunctional metallic-glass wave springs

Panagiotopoulos, Nikolaos T.; Georgarakis, Konstantinos; Jorge Jnr, Alberto Moreira; Aljerf, M.; Botta, Walter José; Greer, Lindsay; Yavari, Ahmad (Elsevier, 2020-05-01)

We show that, using thermo-elastic processing, metallic-glass foils can be shaped, without being embrittled, into linear and annular wave springs. These springs exhibit an undulatory behaviour, unique to metallic-glass ...
An atomistic study of the structural changes in a Zr–Cu–Ni–Al glass-forming liquid on vitrification monitored in-situ by X-ray diffraction and molecular dynamics simulation

Louzguine-Luzgin, D. V.; Georgarakis, Konstantinos; Andrieux, J.; Hennet, L.; Morishita, T.; Nishio, K.; Belosludov, R. V. (Elsevier, 2020-04-29)

Structural changes in the Zr55Cu30Ni5Al10 liquid alloy on cooling from above the equilibrium liquidus temperature are studied by synchrotron radiation X-ray diffraction and compared with the results of first-principles ...
The benefit of the glassy state of reinforcing particles for the densification of aluminum matrix composites

Kvashnin, Vyacheslav I.; Dudina, Dina V.; Ukhina, Arina V.; Koga, Guilherme Yuuki; Georgarakis, Konstantinos (MDPI, 2022-05-07)

In metallic glass-reinforced metal matrix composites, the glassy phase can serve a dual purpose: (i) it can behave as soft binder and porosity remover during consolidation; and (ii) it can act as the hard reinforcing phase ...
Core - shell particle reinforcements - a new trend in the design and development of metal matrix composites

Dudina, Dina V.; Georgarakis, Konstantinos (MDPI, 2022-04-02)

Metal matrix composites (MMCs) are a constantly developing class of materials. Simultaneously achieving a high strength and a high ductility is a challenging task in the design of MMCs. This article aims to highlight a ...
Corrosion of high strength pipeline steel weldment using submerged jet impingement.

Nofrizal (2019-03)

The aim of this research is to evaluate submerged jet impingement (SJI) as a tool for assessing the effect of flow and the associated corrosion behaviour across an X65 high strength pipeline weldment. The focus is corrosion ...
Design optimisation of the feeding system of a novel counter-gravity casting process

Papanikolaou, Michail; Pagone, Emanuele; Georgarakis, Konstantinos; Rogers, Keith; Jolly, Mark R.; Salonitis, Konstantinos (MDPI, 2018-10-11)

The appropriate design of feeders in a rigging system is critical for ensuring efficient compensation for solidification shrinkage, thus eliminating (shrinkage-related) porosity and contributing to the production of superior ...
The effect of Ni or Co additions on the structure of Zr60Cu30Al10 bulk metallic glass revealed by high-energy synchrotron radiation

Stiehler, Martin E.; Panagiotopoulos, Nikolaos T.; Keeble, Dean S.; Ivanov, Yurii P.; Menelaou, Melita; Jolly, Mark R.; Greer, A.Lindsay; Georgarakis, Konstantinos (Elsevier, 2022-04-13)

The effect of substituting Cu by elemental additions of Ni or Co on the atomic structure of the Zr60Cu30Al10 ternary bulk metallic glass (BMG) is studied using high-energy synchrotron radiation X-ray diffraction. Analyses ...
(FeMnNi)84(AlTi)16 high‑entropy alloy: correlation of microstructure, strengthening mechanisms and hardness at various conditions (As‑Cast, solution treated, aged)

Konakoglou, Kimon; Mathiou, C.; Georgatis, E.; Georgarakis, Konstantinos; Karantzalis, A. E. (Springer, 2022-05-02)

A (FeMnNi)84(AlTi)16 high-entropy alloy was produced by vacuum arc melting successfully. The microstructure of the as-cast state showed the existence of two FCC phases along with potential precipitates. The solution treatment ...
Formation of TiC-Cu nanocomposites by a reaction between Ti25Cu75 melt-spun alloy and carbon

Dudina, Dina V.; Korchagin, Michail A.; Gavrilov, Alexander I.; Bulina, Natalia V.; Batraev, Igor S.; Esikov, Maksim A.; Georgarakis, Konstantinos; Kato, Hidemi (Elsevier, 2018-10-02)

In this work, Ti25Cu75 melt-spun partially amorphous alloy was used as a source of Ti and Cu to synthesize in-situ TiC-Cu nanocomposites. The reaction between the alloy and carbon started during ball milling and continued ...
Friction-induced phase transformations and evolution of microstructure of austenitic stainless steel observed by operando synchrotron X-ray diffraction

Emurlaev, K.; Bataev, I.; Ivanov, I.; Lazurenko, D.; Burov, V.; Ruktuev, A.; Ivanov, D.; Rosenthal, M.; Burghammer, M.; Georgarakis, Konstantinos; Jorge Junior, A. M. (Elsevier, 2022-05-22)

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 ...
In-situ structural identification of Zr3Al2 type metastable phase during crystallization of a Zr-based MG

Xing, Yan; Li, Yan; Wang, Xiangke; Yu, Xiangtian; Zhang, Tao; Georgarakis, Konstantinos (Elsevier, 2016-08-21)

A metastable phase was detected using higher energy synchrotron radiation when Zr-based metallic glass (MG) was annealed under vacuum in Linkam hot stage at 848 K. The formation and transformation processes of metastable ...
In-situ TEM study of the crystallization sequence in a gold-based metallic glass

Ivanov, Yu P.; Meylan, Carolina M.; Panagiotopoulos, Nikolaos T.; Georgarakis, Konstantinos; Greer, Lindsay A. (Elsevier, 2020-06-18)

The composition Au49Ag5.5Pd2.3Cu26.9Si16.3 (at.%) is of interest as the basis for the development of gold-based bulk metallic glasses for application in jewellery. In-situ heating in transmission electron microscopy (TEM) ...
Interaction between Fe66Cr10Nb5B19 metallic glass and aluminum during spark plasma sintering

Dudina, Dina V.; Bokhonov, Boris B.; Batraev, Igor S.; Amirastanov, Yusif N.; Ukhina, Arina V.; Kuchumova, Ivanna D.; Legan, Mikhail A.; Novoselov, Aleksey N.; Gerasimov, Konstantin B.; Bataev, Ivan A.; Georgarakis, Konstantinos; Koga, Guilherme Yuuki; Guo, Yaofeng; Botta, Walter José; Jorge, Alberto Moreira (Elsevier, 2020-08-28)

In the area of metal matrix composites, novel reinforcing options are currently being evaluated. Particles of amorphous alloys present an interesting possibility to reinforce soft metals. In the present work, the interaction ...
Investigation on the mechanically-induced nanocrystallization in metallic glasses

Ammari, C.; Yousfi, M. A.; Hajlaoui, K.; Georgarakis, Konstantinos (Elsevier, 2020-11-10)

Shear-induced nanocrystallization in bent ribbons of Pd40Cu30Ni10P20 metallic glass has been quantitatively investigated via synchrotron radiation. The formed nanocrystals volume fraction during deformation has been directly ...
Mechanically induced waves in metallic glass foils

Panagiotopoulos, N. T.; Yousfi, M. A.; Georgarakis, Konstantinos; Yavari, A. R. (Elsevier, 2015-10-29)

The response of vitrified metallic arc foils under normal load is studied. Application of normal load on an initial arc shaped vitrified metallic foil is followed by multiplication of the initial arc. A sinusoidal mathematical ...
Metallic glass-reinforced metal matrix composites: design, interfaces and properties

Georgarakis, Konstantinos; Dudina, Dina V.; Kvashnin, Vyacheslav I. (MDPI, 2022-11-22)

When metals are modified by second-phase particles or fibers, metal matrix composites (MMCs) are formed. In general, for a given metallic matrix, reinforcements differing in their chemical nature and particle size/morphology ...
Metallic iron or a Fe-based glassy alloy to reinforce aluminum: reactions at the interface during spark plasma sintering and mechanical properties of the composites

Dudina, Dina V.; Kvashnin, Vyacheslav I.; Bokhonov, Boris B.; Legan, Mikhail A.; Novoselov, Aleksey N.; Bespalko, Yuliya N.; Moreira Jorge, Alberto; Koga, Guilherme Y.; Ukhina, Arina V.; Shtertser, Alexandr A.; Anisimov, Alexander G.; Georgarakis, Konstantinos (MDPI, 2023-07-23)

The microstructural features and mechanical properties of composites formed by spark plasma sintering (SPS) of Al + 20 vol.% Fe and Al + 20 vol.% Fe66Cr10Nb5B19 (glassy alloy) mixtures composed of micrometer-sized particles ...
Microstructure and mechanical properties of composites obtained by spark plasma sintering of Al–Fe66Cr10Nb5B19 metallic glass powder mixtures

Dudina, Dina V.; Bokhonov, Boris B.; Batraev, Igor S.; Kvashnin, Vyacheslav I.; Legan, Mikhail A.; Novoselov, Aleksey N.; Anisimov, Alexander G.; Esikov, Maksim A.; Ukhina, Arina V.; Matvienko, Alexander A.; Georgarakis, Konstantinos; Koga, Guilherme Yuuki; Jorge, Alberto Moreira (MDPI, 2021-09-15)

At present, metallic glasses are evaluated as alternative reinforcements for aluminum matrix composites. These composites are produced by powder metallurgy via consolidation of metallic glass-aluminum powder mixtures. In ...
Nanoporous silver for electrocatalysis application in alkaline fuel cells

Barsuk, Daria; Zadick, Anicet; Chatenet, Marian; Georgarakis, Konstantinos; Panagiotopoulos, Nikolaos T.; Champion, Yannick; Moreira Jorge, Alberto (Elsevier, 2016-09-10)

Self-supporting porous silver foils with an average pore size < 100 nm were produced from a crystalline silver-based ternary alloy as a precursor by removing second phases present in the silver matrix. The final Ag-based ...
Novel micro-flat springs using the superior elastic properties of metallic glass foils

Yousfi, M. A.; Panagiotopoulos, N. T.; Jorge Junior, A. M.; Georgarakis, Konstantinos; Yavari, A. R. (Elsevier, 2017-01-23)

A thin metallic glass foil of 100 mg mass forming a sinusoidal arc behaves as non-conventional flat micro-spring withstanding loads 105 times higher than its load. Upon a normal load applied on the top of the arc, the foil ...

Browsing by Author "Georgarakis, Konstantinos"

Browsing by Author "Georgarakis, Konstantinos"

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