Abstract. Influence of annealing cycles up to 650 °C on the specific conductivity (Ω) and hardness (HV) of hot-rolled sheets of aluminum alloys containing up to 0.5 wt% Zr was studied. By using analytical calculations of phase composition and experimental methods (SEM, TEM, EMPA, etc.) it is demonstrated that the conductivity depends first of all on the concentration of zirconium in the aluminum solid solution which is minimum after 3-h holding at 450 °C. On the other hand, the hardness of the alloy is mainly caused by the amount of nanoparticles of the L1 2 (Al 3 Zr) phase that defines the retention of strain hardening. It is shown that the best combination of Ω and HV values can be reached within an acceptable holding time at the temperature about 450 °C. *corresponding author: nikolay-belov@yandex.ru, +7 495 9511928
Al–Cu–Ce alloys have been studied in the Al-rich corner using the microstructural (LM and SEM), thermal (direct and DSC), X-ray diffraction and electron probe microanalysis techniques. Three cross-sections were of particular interest: (a) at 20%Cu (up to 12.5%Ce), (b) at 14%Cu (up to 10%Cu) and (c) at a ratio Cu:Ce=2:1 (up to 10%Ce and 20%Cu). As-cast alloys and those after annealing at 540 and 590°C were studied. Boundaries of appearance of the Al8CeCu4 primary crystals and ternary eutectic involving the phase Al2Cu were determined. The radial cross section (Cu:Ce=2:1) is supposed to be of quasibinary type as ternary eutectic does not form. The temperature and concentrations of the eutectic reaction L–(Al)+CeCu4Al8 were found to be 610°C, 14%Cu and 7%Ce. This binary eutectic has fine microstructure and is capable to fragmentation and spheroidization during heating. The paper considers possibility of using the Al–Cu–Ce system for developing novel Al casting alloys with significantly improved casting properties (hot tearing and fluidity) in comparison with 2xx commercial alloys.
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