OANCA Octavian Polytechnic University of Timisoara

Spoluautoři BORDEASU Ilare, MITELEA Ion, CRACIUNESCU Corneliu

At room temperatures, the bronzes with about 10% Al have an equilibrium microstructure composed from „α” aluminium solid solution in copper and from the eutectoid “α+γ” (γ being the compound Cu32Al19). The nickel presence improves the mechanical properties and wear resistance both at low and high (500…600°C) temperatures. The iron presence lead to grain finishing, improvement of mechanical properties and increased antifriction qualities. The alloys with 9…11% Al and addition of Ni, Fe, Mn could be hardened by two heat treatments: quenching and aging through dispersion. The paper put into evidence the role of the heat treatment upon the cavitation erosion of such alloys. Cavitation was produced in laboratory using a vibration procedure. The evolution in time of “Mean Depth Erosion” (MDE) and “Mean depth Erosion Rate” (MDER) were used as characteristic parameters. The maximum cavitation exposure was of 165 minutes divided in 12 intervals (after 5, 10 minutes and in continuation 10 intervals of 15 minutes).