1. Heterogenous equilibria in Al-Mn quasicrystalline alloy during high-pressure die castingBorut Dremelj, Adam Zaky, Iztok Naglič, Matej Zupančič, Boštjan Markoli, 2026, izvirni znanstveni članek Ključne besede: Al-alloys, quasicrystals, equilibrium, HPDC
Objavljeno v DiRROS: 22.06.2026; Ogledov: 242; Prenosov: 162
 Celotno besedilo (3,64 MB)
Gradivo ima več datotek! Več... |
2. Vpliv postopkov modifikacije in toplotne obdelave na mikrostrukturo in mikrotrdoto aluminijeve zlitine AlSi9Cu3Iztok Naglič, Adam Zaky, Nedžad Kanurić, Matej Zupančič, Boštjan Markoli, 2025, izvirni znanstveni članek Ključne besede: aluminium alloys, modification, microstructure, microhardness
Objavljeno v DiRROS: 15.06.2026; Ogledov: 305; Prenosov: 135
Celotno besedilo (2,38 MB) |
3. |
4. Electrocatalytic trends of different Cantor entropy alloys for alkaline and acidic hydrogen-evolution reactionsBarbara Ljubec Božiček, Bor Arah, Monika Kušter, Iztok Naglič, Boštjan Markoli, Maja Ponikvar-Svet, Lara Einfalt, Miran Čeh, Belisa Alcantara Marinho, 2024, izvirni znanstveni članek Povzetek: Medium- and high-entropy alloys (MEAs and HEAs) are the basis of unique electrocatalysts for hydrogen-evolution reactions (HERs) due to their tunable chemical compositions and microstructures. Here, various Cantor MEAs (CoFeNi, CoFeNiMn, CoFeNiCr) and a HEA (CoFeNiMnCr) made up of affordable non-noble transitional metals with different structures (primary matrix and secondary phases, grain sizes, lattice parameters) were successfully synthesized with an inert-gas melting process. A close correlation was established between their physicochemical properties (elemental composition, microstructure, crystal structure) and the hydrogen-binding ability of the elements in the alloy on the electrocatalytic HER activity and stability in alkaline and acidic media. Advanced performances of electrocatalysts toward HERs were revealed in a specially designed electrochemical cell. Effectively identifying these electrocatalytic trends lays the groundwork for the strategic design of multi-component alloy electrocatalysts for practical HERs.
Ključne besede: water-spliting, hydrogen-binding energy, medium-entropy alloys, high-entropy alloys, spillover effect
Objavljeno v DiRROS: 10.11.2025; Ogledov: 764; Prenosov: 433
Celotno besedilo (4,83 MB)
Gradivo ima več datotek! Več... |
5. Comparative study of microstructural influence on corrosion resistance in conventional and Al-Mn quasicrystalline cast aluminum alloysMirjam Bajt Leban, Tim Drevenšek, Tadeja Kosec, Blaž Leskovar, Boštjan Markoli, 2025, izvirni znanstveni članek Povzetek: The investigation focused on the quasicrystalline aluminum alloy Al-Mn-Cu-Mg-Si-Ti. The influence of microstructure of aluminum alloy strengthened with quasicrystals on its corrosion resistance was studied. The properties of newly designed quasicrystalline aluminum alloy (QC) were compared to the properties of standard AlSi9Cu3 alloy (DIN 226). Both aluminum alloys (QC and AlSi9Cu3) were cast in a steel die with a controlled cooling rate. After the preparation of the samples, the microstructural characterization was carried out. In the quasicrystalline alloy, the microstructure was dominated by a primary phase with fivefold symmetry, representing the quasicrystalline phase. To investigate corrosion properties, open-circuit potential, linear polarization and potentiodynamic polarization measurements were performed. The influence of corrosion on mechanical properties was studied by conducting tensile tests on environmentally exposed alloys. It was concluded that the quasicrystalline alloy has comparable corrosion properties to the commercially widely used AlSi9Cu3 alloy. In the latter alloy, corrosion was observed to initiate in the vicinity of the Al2Cu intermetallic compound particles. In the case of the QC alloy, corrosion attacked mainly the αAl phase (matrix).
Ključne besede: quasicrystals, corrosion, aluminum alloys, microstructure, electrochemical measurements
Objavljeno v DiRROS: 14.07.2025; Ogledov: 901; Prenosov: 810
Celotno besedilo (2,96 MB)
Gradivo ima več datotek! Več... |
6. Fracture analysis of cemented-carbide inserts for the dry cutting of repen limestoneJože Kortnik, Boštjan Markoli, Matej Zupančič, Adam Zaky, Iztok Naglič, 2025, izvirni znanstveni članek Ključne besede: cemented carbide, fracture analysis, stone cutting inserts, chainsaw machine
Objavljeno v DiRROS: 11.04.2025; Ogledov: 1125; Prenosov: 632
Celotno besedilo (3,18 MB)
Gradivo ima več datotek! Več... |
7. Unveiling the potential of ▫$(CoFeNiMnCr)_3O_4$▫ high-entropy oxide synthesized from CoFeNiMnCr high-entropy alloy for efficient oxygen-evolution reactionBarbara Ljubec Božiček, Jitka Hreščak, Monika Kušter, Janez Kovač, Iztok Naglič, Boštjan Markoli, Barbara Šetina, Martin Šala, Sandra Drev, Živa Marinko, Miran Čeh, Belisa Alcantara Marinho, 2024, izvirni znanstveni članek Povzetek: Electrochemical water-splitting is a promising green technology for the production of hydrogen. One of the bottlenecks, however, is the oxygen evolution half-reaction (OER), which could be overcome with the development of a suitable electrocatalyst. Recently, non-noble metal, high-entropy oxides (HEO) have been investigated as potential OER electrocatalysts, but complex synthesis approaches that usually produce the material in powder form limit their wider utilization. Here, an innovative synthesis strategy of formulating a nanostructured (CoFeNiMnCr)3O4 HEO thin film on a CoFeNiMnCr high entropy alloy (HEA) using facile electrochemical and thermal treatment methods is presented. The CoFeNiMnCr HEA serves as exceptional support to be electrochemically treated in an ethylene glycol electrolyte with ammonium fluoride to form a rough and microporous structure with nanopits. The electrochemically treated CoFeNiMnCr HEA surface is more prone to oxidation during a low-temperature thermal treatment, leading to the growth of a spinel (CoFeNiMnCr)3O4 HEO thin film. The (CoFeNiMnCr)3O4 HEO exhibits a superior overpotential of 341 mV at 10 mA cm−2 and a Tafel slope of 50 mV dec−1 along with remarkable long-term stability in alkaline media. The excellent catalytic activity and stability for the OER can serve as a promising platform for the practical utilization of (CoFeNiMnCr)3O4 HEO.
Ključne besede: electrochemical water-spliting, electrocatalysts
Objavljeno v DiRROS: 20.12.2024; Ogledov: 1908; Prenosov: 707
Celotno besedilo (2,75 MB)
Gradivo ima več datotek! Več... |
8. Life cycle assessment of metal alloys for structural applicationsKatja Malovrh Rebec, Boštjan Markoli, Blaž Leskovar, 2018, objavljeni znanstveni prispevek na konferenci (vabljeno predavanje) Povzetek: The study compared environmental footprints of two types of Al-alloys: well-known 5083 aluminium alloy with magnesium and traces of manganese and chromium in its composition. This material is highly resistant to seawater corrosion and the influence of industrial chemicals. Furthermore, it retains exceptional strength after welding. The comparisons were made to an innovative alloy where the aluminium based matrix is reinforced by metastable quasicrystals (QC), thus avoiding magnesium in its composition. Furthermore, we checked other aluminium ingots' footprints and compared European average and Germany country specific production data. Environmental footprints were assessed via cradle to gate life cycle assessment. Our findings normalized to 1 m2 plate suggest, that newly proposed alloy could save around 50 % in value of parameters abiotic resources depletion of fossil fuels, acidification, eutrophication, global warming potential and photochemical ozone creation potential if we compare Qc5 to 6 mm 5083 alloy plate. Only abiotic resources depletion of elements and ozone depletion parameters increase for Qc5 compared to 6 mm 5083 alloy plate.
Ključne besede: environmental footprints, LCA, Al-alloys
Objavljeno v DiRROS: 05.04.2024; Ogledov: 1681; Prenosov: 832
Celotno besedilo (2,29 MB)
Gradivo ima več datotek! Več... |
