Numéro : 2173 - Year : 1991

Cavitation erosion behaviour of various types of CU-AL polyphases alloys

J.-L. HEUZE, SERVICE TECHNIQUE DES CONSTRUCTIONS ET ARMES NAVALES (STCAN), GROUPE MA TER IAUX ET STRUCTURES NAVALS (MSN)
B. MASSON, SERVICE TECHNIQUE DES CONSTRUCTIONS ET ARMES NAVALES (STCAN), GROUPE MA TER IAUX ET STRUCTURES NAVALS (MSN)
A. KARIMI, INSTITUT DE GENIE A TOMIQUE, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE

Cavitation erosion resistance of aluminium bronzes, single and multiphase alloys, has been studied with a cavitation vortex generator. Pur copper is used to reference. Optical, scanning and electron microscopy as well as microhardness measurements are used to investigate the erosion mechanism. Complex aluminium bronzes where found considerably more resistant than pur copper, single phase CuAI alloys but also stainless steel such as 316L. We observed that the erosion mechanism of single phase CuAI alloys is governed essentially by hardening of a phase which depends on Stacking Fault Energy. Concerning the complex aluminium bronzes CuAI Ni Fe, erosion resistance provide both from hardening of a phase and from the percentage and the distribution of intermetallic kappa precipitates.

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