Razvoj nove livarske aluminijeve zlitine z dodatkom litijaZeka, Bastri (Avtor) Petrič, Mitja (Mentor) Markoli, Boštjan (Komentor) Al-Li alloymeltingsolidificationphasesreactionsmicrostructurestructure.Aluminum-lithium (Al-Li) alloys represent a significant advancement in materials science, particularly valued in aerospace for their exceptional properties. Lithium incorporation reduces density and enhances mechanical characteristics, though it presents challenges due to high reactivity with oxygen and other elements, necessitating stringent control over processing conditions. Since the 1940s, Al-Li alloys have evolved through three generations. The first generation focused on weight reduction and stiffness enhancement via ?' (Al3Li) precipitation. Subsequent generations improved mechanical properties. The current generation optimizes these alloys for specific aerospace applications, focusing on manufacturability, environmental stability, and performance under extreme conditions. Evaluations of second-generation Al-Li alloys revealed gas porosity issues in shape casting, mitigated by graphite wash. Successful castings were achieved using metal and graphite molds or no-bake organic binder-based sand systems. Al-Li-Mg and Al-Li-Cu-Mg alloys with 2.5 wt. % lithium exhibited favourable castability, fluidity, and strength. The mechanical properties of Al-Li alloys are influenced by the type, size, volume fraction, and distribution of precipitates within grains and at grain boundaries. The primary strengthening phase is ?' (Al3Li), with additional strengthening from ?' (Al2Cu), T1 (Al2CuLi), and S (Al2CuMg) precipitates. Zirconium prevents recrystallization through ß' (Al3Zr) precipitates. Third-generation alloys improved corrosion resistance and anisotropy issues, leading to applications in aerospace and defence. This scientific PhD research develops a new cast AlSi7MgLi alloy featuring superior mechanical properties and the innovative AlLiSi phase. A comprehensive thermodynamic model for the AlSi7MgLi alloy elucidates its solidification process and microstructural characteristics, focusing on optimizing casting methodologies and understanding microstructural evolution. Advanced techniques, including light microscopy, SEM, EDS, XRD, and TEM, provided in-depth insights into the alloy phase composition and detailed the structure of the phases. Mechanical properties were evaluated using the Gleeble machine, and nanomechanical properties were meticulously assessed through nanoindentation.B. Zeka20242024-12-14 09:00:07Doktorsko delo/naloga165953UDK: 669VisID: 104836COBISS_ID: 220029443sl