1. Microstructural evolution and its impact on mechanical and corrosion performance of 316L ODS steels processed by mechanical alloying and pulse plasma sinteringAnna Dobkowska, Kalyan Das, Mirosław Jakub Kruszewski, Aleksandra Zielińska, Marlene González, Bogusława Adamczyk-Cieślak, Jiří Kubásek, Jan Pokorný, David Nečas, Črtomir Donik, Irena Paulin, Kamil Majchrowicz, Jarosław Mizera, Matjaž Godec, 2026, izvirni znanstveni članek Ključne besede: ODS steels, austenitic steels, corrosion, mechanical properties
Objavljeno v DiRROS: 02.03.2026; Ogledov: 129; Prenosov: 104
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2. Gamma irradiation-induced modifications in the structural and dielectric properties of GO/PVA/AgNW nanocompositesMarjetka Conradi, Črtomir Donik, Mustafa Muradov, Goncha Eyvazova, Ahmet Asimov, Mahammad Baghir Baghirov, 2026, izvirni znanstveni članek Ključne besede: gamma irradiation, nanocomposite, graphene oxide, silver nanowire
Objavljeno v DiRROS: 26.02.2026; Ogledov: 195; Prenosov: 63
Celotno besedilo (1,35 MB)
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3. Laser-engineered Inconel 625 for enhanced oxygen evolution electrocatalysisAngelja Kjara Surca, Marjan Bele, Črtomir Donik, Irena Paulin, Martin Šala, Jakob Starec Oman, Miha Osredkar, Mejrema Nuhanović, Jan Ocepek, Matjaž Godec, Goran Dražić, Nejc Hodnik, Luka Suhadolnik, 2026, izvirni znanstveni članek Objavljeno v DiRROS: 02.02.2026; Ogledov: 196; Prenosov: 128
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5. Insights into surface microstructural engineering of Inconel 625 for enhanced oxygen evolution reaction performanceLuka Suhadolnik, Črtomir Donik, Blaž Tomc, Mejrema Nuhanović, Martin Šala, Marjan Bele, Matjaž Finšgar, Andraž Mavrič, Iztok Arčon, Matjaž Godec, Nejc Hodnik, 2025, izvirni znanstveni članek Ključne besede: electrocatalysis, compositionally complex materials, commercial nickel alloys, oxygen evolution reaction, scanning electron microscopy, IL-SEM
Objavljeno v DiRROS: 29.10.2025; Ogledov: 496; Prenosov: 278
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6. A core–shell TiON–C nanostructure as a self supported and scalable electrode for fast oxygen evolution reaction in acidic mediaFederico Baiutti, Kosova Kreka, Aleš Marsel, Miha Hotko, Marjan Bele, Anja Logar, Martin Šala, Črtomir Donik, Lazar Bijelić, Carolina Duque Serra, Alex Morata, Albert Tarancón, Miran Gaberšček, Nejc Hodnik, 2025, izvirni znanstveni članek Ključne besede: PEMEC, fuel cells, hydrogen, titania, iridium, anode
Objavljeno v DiRROS: 29.10.2025; Ogledov: 483; Prenosov: 209
Celotno besedilo (1,83 MB)
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7. Workflow and practical guidance for identical location scanning electron microscopy: reliable tracking of localized transformationsBlaž Tomc, Marjan Bele, Ana Rebeka Kamšek, Milena Martins, Aleš Marsel, Miha Hotko, Stefan Popović, Gregor Kapun, Črtomir Donik, Mitja Kostelec, Matjaž Godec, Nejc Hodnik, Luka Suhadolnik, 2025, izvirni znanstveni članek Povzetek: Understanding material transformations at the nano- and microscale is essential for advancing electrocatalysis, energy storage, and other applications. Conventional SEM imaging, which captures random locations before and after treatment, struggles to distinguish real transformations from inherent sample heterogeneity. Identical Location SEM (IL-SEM) overcomes this by enabling re-imaging of the exact same region, offering clear evidence of localized changes in morphology, structure, and composition. Despite its simplicity and wide applicability, IL-SEM remains underutilized. This article presents a detailed, practical guide to implementing IL-SEM reliably, including sample alignment, multiscale imaging, and consistent re-localization. Key methodological tips and solutions to common challenges are provided, making the approach accessible even for non-expert users. To showcase its versatility, we present case studies involving electrocatalysts, alloys, and nanostructured materials. Moreover, by integrating IL-SEM with energy-dispersive spectroscopy (EDS) and electron backscatter diffraction (EBSD), we demonstrate how compositional and crystallographic evolution can be tracked alongside morphological changes. This optimized workflow offers a powerful, non-destructive method for visualizing dynamic material behavior and provides a foundation for IL-SEM to become a standard technique for studying structural evolution across diverse materials research fields.
Ključne besede: electrocatalysis, identical location electron microscopy, IL-SEM, materials characterization, scanning electron microscopy, surface analysis
Objavljeno v DiRROS: 15.10.2025; Ogledov: 544; Prenosov: 273
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8. Grain-resolved mapping of oxygen evolution activation on a Ni-superalloyČrtomir Donik, Luka Suhadolnik, Blaž Tomc, Anton Voronkin, Jon Ustarroz, Marjan Bele, Matjaž Godec, Nejc Hodnik, 2025, izvirni znanstveni članek Povzetek: We report the first grain-resolved mapping of oxygen evolution reaction (OER) activation on a Ni-based superalloy using identicallocation EBSD, complemented by IL-SEM, IL-EDS, and SECCM. NiFe (oxy)hydroxide film formation and OER activity are strongly influenced by grain size and orientation, with (111)-oriented and smaller grains showing the highest activity. These findings reveal pronounced microstructure heterogeneity and establish IL-EBSD as a powerful tool for guiding the design of advanced electrocatalysts.
Ključne besede: Ni-superalloy, IL-SEM, IL-EDS, SECCM
Objavljeno v DiRROS: 10.10.2025; Ogledov: 483; Prenosov: 215
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9. Towards increased strength and retained ductility of Zn-Mg-(Ag) materials for medical devices by adopting powder metallurgy processing routesJiří Kubásek, David Nečas, Vojtěch Hybášek, Eva Jablonská, Črtomir Donik, Irena Paulin, Peter Gogola, Martin Kusý, Jaroslav Fojt, Miroslav Čavojský, Jan Duchoň, Jaroslav Čapek, 2025, izvirni znanstveni članek Povzetek: The development of bioabsorbable zinc-based alloys with tailored mechanical properties and biocompatibility holds great promise for advancing medical implant technology. In this study, Zn-Mg and Zn-Mg-Ag alloys were synthesized using mechanical alloying (MA) followed by extrusion to achieve a combination of enhanced strength, ductility, and corrosion resistance. MA for 4 hours produced ultrafine-grained powders incorporating Mg₂Zn₁₁ intermetallic phases and oxide particles, which contributed to microstructure stabilization during subsequent processing. Extrusion consolidated these powders into dense materials with a uniform grain size of ~700 nm, exhibiting ultimate tensile strengths up to 435 MPa and elongation to fracture of ~12%, representing a significant improvement over conventional processing methods. The addition of silver further enhanced the antibacterial properties, demonstrating notable efficacy against Staphylococcus epidermidis, while maintaining non-cytotoxic behavior in vitro. Corrosion rates remained low, with uniform surface degradation and the formation of protective corrosion layers. This work highlights the efficacy of combining powder metallurgy techniques to bioabsorbable zinc-based alloys with exceptional mechanical performance, corrosion behavior and in vitro cytocompatibility, providing a pathway for next-generation biodegradable medical devices.
Ključne besede: zinc, bioabsorbable materials, mechanical alloying, spark plasma sintering, microstructure
Objavljeno v DiRROS: 05.08.2025; Ogledov: 565; Prenosov: 309
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10. Influence of laser beam shape and post heat-treatment on the microstructure and mechanical properties of nickel-based alloy IN718 manufactured by laser powder bed fusionMatjaž Godec, Narges Mirzabeigi, Črtomir Donik, Danijela Anica Skobir Balantič, Simon Malej, Irena Paulin, Bojan Podgornik, Jonas Grünewald, Tobias Novotny, Florian Bayer, Francisco Ruiz-Zepeda, Katrin Wudy, 2025, izvirni znanstveni članek Povzetek: This study examines the effect of Gaussian and ring-shaped laser beam profiles on the microstructural development and mechanical properties of the PBF-LB/M processed nickel-based alloy Inconel 718 in its as-built and post-heat-treated conditions. Beam shaping was employed to achieve a faster build rate without compromising material properties. One of the objectives was to optimise heat treatment conditions for the beam-shaped profile. The post-heat-treatment process included four different solution annealing temperatures (954 °C, 984 °C, 1034 °C and 1154 °C), followed by two-step ageing, respectively. The microstructure evolution was revealed using scanning electron microscopy (SEM) equipped with energy-dispersive X-ray diffraction (EDS). The mechanical properties in all investigated conditions were evaluated based on tensile tests at room temperature. Using a Gaussian laser beam profile results in a fine-grained microstructure without a strong columnar orientation, while the ring beam profile produces a distinct columnar structure with larger nanodendritic grains and dislocation cells. Both beam profiles exhibit a similar proportion of Laves phase. After post-heat treatment, the Gaussian beam profile generally provides 3-7 % higher mechanical properties. The differences in mechanical properties between horizontal and vertical building directions are greater for ring-shaped laser beam profiles. Heat-treatment temperature above 1034 °C leads to recrystallisation, grain growth and the formation of carbonitrides which reduce mechanical properties. Based on the results, the proposed optimal heat-treatment temperature for both investigated laser beam shapes is 984 °C. At this temperature, tensile strength equalises between horizontal and vertical build directions while yield strength increases, which is beneficial for most applications.
Ključne besede: PBF-LB/M, beam shaping, IN718, heat treatment, mechanical properties
Objavljeno v DiRROS: 07.07.2025; Ogledov: 700; Prenosov: 349
Celotno besedilo (28,27 MB)
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