1. Rafinacija aluminijevih gnetnih zlitin z uporabo višjih deležev sekundarnih surovinUroš Kovačec, Franc Zupanič, Tonica Bončina, 2026, izvirni znanstveni članek Ključne besede: aluminium, refinement, flux, cleanliness, non-metallic inclusion, rotary injection, alkali element
Objavljeno v DiRROS: 16.06.2026; Ogledov: 276; Prenosov: 111
 Celotno besedilo (1,28 MB) |
2. |
3. Enhanced mechanical performance and refined intermetallic layer in underwater friction-stir-welded AA5083–Cu dissimilar jointsPattanam Ramamoorthy Kannan, N. Premkumar, M. Arul, S. Dinesh, 2026, izvirni znanstveni članek Ključne besede: underwater friction stir welding, AA5083 aluminum, pure copper, dissimilar joints, intermetallic compounds, mechanical properties, microstructural refinement, SEM analysis
Objavljeno v DiRROS: 04.03.2026; Ogledov: 506; Prenosov: 341
Celotno besedilo (6,75 MB)
Gradivo ima več datotek! Več... |
4. Microstructure refinement of Nd-Fe-B permanent magnets prepared via spark-plasma sinteringTomaž Tomše, 2024, izvirni znanstveni članek Povzetek: Sintered Nd-Fe-B-type permanent magnets are normally manufactured using a conventional powder-metallurgy approach. The limitations of such high-temperature, pressureless sintering methods include restricted control over the microstructure due to grain growth and constraints on the magnet’s geometry. The modern spark-plasma sintering (SPS) technique employs Joule heating and external pressure to offer lower consolidation temperatures and faster heating cycles compared to conventional approaches. As a result, the SPS has the potential for the rapid, low-temperature, net-shape manufacture of magnets. However, the nonequilibrium conditions associated with the SPS can lead to poor grain-boundary wetting and the formation of the soft-magnetic α-iron phase in samples prepared from anisotropic, microcrystalline Nd-Fe-B powders produced by standard procedures, i.e., strip casting, hydrogen decrepitation, and jet-milling. This study revealed that the absence of the Nd-rich grain-boundary film is related to the presence of hydrogen. Degassing the Nd-Fe-B powder before applying the SPS improved the distribution of the grain-boundary phase. Moreover, reducing the electrical currents in the sample during the SPS prevented the decomposition of the RE2Fe14B matrix, ensuring a favorable phase composition. Compared to magnets conventionally sintered at 1070 °C, the mean grain diameter of the SPS samples prepared at ≈880 °C was reduced by ≈33%. This reduction decreased the temperature coefficient of coercivity from -0.65 to -0.58%/°C. The coercivity increase measured for the SPS samples amounted to more than 15%, which was attributed to the combined effect of smaller grain size and reduced texture.
Ključne besede: spark-plasma sintering, microstructure refinement
Objavljeno v DiRROS: 28.03.2025; Ogledov: 1427; Prenosov: 685
Celotno besedilo (9,55 MB)
Gradivo ima več datotek! Več... |
5. A family of $C^1$ Clough-Tocher spline spaces on $C^0$ piecewise quadratic domain partitionsJan Grošelj, Marjetka Knez, 2025, izvirni znanstveni članek Povzetek: The paper addresses the construction of $C^1$ splines on a curved domain that is parametrized by a $C^0$ piecewise geometry mapping composed of quadratic Bézier triangles. The $C^1$ splines are assembled from polynomials of a chosen total degree greater than or equal to four, and their construction is based on the Clough-Tocher splitting technique that ensures locality. In particular, the splines are locally characterized by an interpolation problem described by Hermite data, which resembles the standard macro-element concepts developed for $C^1$ splines on triangulations.
Ključne besede: quadratic triangle, quadratic triangulation, isogeometric functions, Clough-Tocher refinement, spline space, dimension, basis functions
Objavljeno v DiRROS: 24.03.2025; Ogledov: 912; Prenosov: 614
Celotno besedilo (5,58 MB)
Gradivo ima več datotek! Več... |
