| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tuomisto, Filip
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (44/44 displayed)
- 2024Suppression of helium migration in arc-melted and 3D-printed CoCrFeMnNi high entropy alloycitations
- 2024Suppression of helium migration in arc-melted and 3D-printed CoCrFeMnNi high entropy alloycitations
- 2024Solubility of Hydrogen in a WMoTaNbV High-Entropy Alloycitations
- 2023Hydrogen isotope exchange experiments in high entropy alloy WMoTaNbVcitations
- 2022Irradiation Damage Independent Deuterium Retention in WMoTaNbVcitations
- 2021Properties of HPT-Processed Large Bulks of p-Type Skutterudite DD0.7Fe3CoSb12 with ZT > 1.3citations
- 2021Identification of Point Defects in Multielement Compounds and Alloys with Positron Annihilation Spectroscopycitations
- 2020Segregation of Ni at early stages of radiation damage in NiCoFeCr solid solution alloyscitations
- 2020Ti-Sr antisitecitations
- 2020Ti-Sr antisite : An abundant point defect in SrTiO3citations
- 2019Ga vacancies and electrical compensation in beta-Ga2O3 thin films studied with positron annihilation spectroscopycitations
- 2019Ga vacancies and electrical compensation in β-Ga 2 O 3 thin films studied with positron annihilation spectroscopycitations
- 2018Effects of alloy composition and Si-doping on vacancy defect formation in (InxGa1-x)2O3 thin filmscitations
- 2018Hydrogen-induced strain localisation in oxygen-free copper in the initial stage of plastic deformationcitations
- 2017Detector resolution in positron annihilation Doppler broadening experimentscitations
- 2017Positron annihilation analysis of the atomic scale changes in oxidized Zircaloy-4 samplescitations
- 2017Effects of grain size and deformation temperature on hydrogen-enhanced vacancy formation in Ni alloyscitations
- 2016Review-Defect Identification with Positron Annihilation Spectroscopy in Narrow Band Gap Semiconductorscitations
- 2016Electrical compensation via vacancy-donor complexes in arsenic-implanted and laser-annealed germaniumcitations
- 2015Increased p-type conductivity in GaNxSb1-x, experimental and theoretical aspectscitations
- 2015Annealing effect on donor-acceptor interface and its impact on the performance of organic photovoltaic devices based on PSiF-DBT copolymer and C-60citations
- 2015Role of excessive vacancies in transgranular stress corrosion cracking of pure coppercitations
- 2015Advanced techniques for characterization of ion beam modified materialscitations
- 2014Substitutionality of nitrogen atoms and formation of nitrogen complexes and point defects in GaPN alloyscitations
- 2014Effect of growth temperature on the epitaxial growth of ZnO on GaN by ALDcitations
- 2013Origin of band gap bowing in dilute GaAs1-xNx and GaP1-xNx alloyscitations
- 2012Matter-positronium interactioncitations
- 2012Low energy electron beam induced vacancy activation in GaNcitations
- 2012Tailoring the Chain Packing in Ultrathin Polyelectrolyte Films Formed by Sequential Adsorptioncitations
- 2012Point defect evolution in low-temperature MOCVD growth of InNcitations
- 2012Interplay of native point defects with ZnO Schottky barriers and dopingcitations
- 2011Self-compensation in semiconductorscitations
- 2010Papers presented at the 2009 E-MRS Fall Meeting, Symposium H
- 2010Effect of hydrogen on plastic strain localization in single crystals of austenitic stainless steelcitations
- 2010Vacancy defects in bulk ammonothermal GaN crystalscitations
- 2009Effect of Hydrogen on Plastic Strain Localization in Single Crystals of Nickel and Austenitic Stainless Steel
- 2009Native vacancy defects in Zn1-x(Mn,Co)(x)GeAs2 studied with positron annihilation spectroscopycitations
- 2009Effect of growth conditions on vacancy defects in MOVPE grown AlN thin layerscitations
- 2008Evidence of PPII-like helical conformation and glass transition in a self-assembled solid-state polypeptide-surfactant complexcitations
- 2007Hierarchical porosity in self-assemhled polymerscitations
- 2007Interplay of Ga vacancies, C impurities and yellow luminescence in GaNcitations
- 2007Hierarchical porosity in self-assemhled polymers:Post-modification of block copolymer-phenolic resin complexes hy pyrolysis allows the control of micro- and mesoporositycitations
- 2007Defect distribution in a-plane GaN on Al2O3citations
- 2006Effect of the misorientation of the 4H-SiC substrate on the open volume defects in GaN grown by metal-organic chemical vapor depositioncitations
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article
Hydrogen-induced strain localisation in oxygen-free copper in the initial stage of plastic deformation
Abstract
Single crystals of oxygen-free copper oriented to easy glide of dislocations were tensile tested in order to study the hydrogen effects on the strain localisation in the form of slip bands appearing on the polished specimen surface under tensile straining. It was found that hydrogen increases the plastic flow stress in Stage I of deformation. The dislocation slip localisation in the form of slip bands was observed and analysed using an online optical monitoring system and atomic force microscopy. The fine structure of the slip bands observed with AFM shows that they consist of a number of dislocation slip offsets which spacing in the presence of hydrogen is markedly reduced as compared to that in the hydrogen-free specimens. The tensile tests and AFM observations were accompanied with positron annihilation lifetime measurements showing that straining of pure copper in the presence of hydrogen results in free volume generation in the form of vacancy complexes. Hydrogen-enhanced free-volume generation is discussed in terms of hydrogen interactions with edge dislocation dipoles forming in double cross-slip of screw dislocations in the initial stage of plastic deformation of pure copper.