Вплив температури на структуру та механічні властивості композиційного квазікристалічного сплаву Al94Fe3Cr3, консолідованого під тиском

• Datum: 2018
• Hauptverfasser: Yurkova, A.І., Kravchenko, О.І.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Physico- Technological Institute of Metals and Alloys of the NAS of Ukraine 2018
• Online Zugang: https://momjournal.org.ua/index.php/mom/article/view/2018-2-3
• Назва журналу: Metal Science and Treatment of Metals

Consolidation of powdered Al-based alloy with nominal composition of Al94Fe3Cr3, which was fabricated by water-atomisation technique using high-pressure water, was performed under quasi-hydrostatic pressure (2.5 and 4 GPa) at the room temperature. The annealing of the composite quasicrystalline Al94Fe3Cr3 alloy was carried out in the temperature range 350-600 °С. The influence of temperature on the structure and mechanical characteristics (microhardness number, HV, and yield stress, s0.2, plasticity characteristic δH) of as-consolidated Al94Fe3Cr3 alloy were characterized by XRD, SEM analysis and the test method procedures of indentation technique. It is shown that the strength characteristics of the alloy retain high values up to a temperature of 400 °C, at which quasicrystalline particles of i-phase dissolve in α-Al matrix with the simultaneous formation of the crystalline metastable Al6Fe intermetallic. A significant decrease in the strength of the alloy occurs when the annealing temperature increases to 600 °C, which is accompanied by the conversion of the metastable intermetallic Al6Fe phase to stable crystalline intermetallic θ-phases: Al13Cr2 and Al13Fe4.