Erosion de cavitation d'alliages amortissants à base de manganèse et de cuivre

Cavitation Erosion of High Damping Manganese and Copper Based Alloys

¹ Institut de Génie Atomique, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne (Suisse)
² Service Technique des Constructions et Armes Navales, Groupe M.S.N., 8, bd Victor, 75732 Paris Cedex 15

Abstract

High damping capacity of Mn and Cu based alloys have been subjected to cavitation erosion in a vortex generator. These alloys show a moderate cavitation erosion resistance, close to Cu Al9 alloy. The experimental results revealed a better resistance of Cu-Mn alloys compared with Mn-Cu alloys. The dendritic phase rich in iron and heterogeneous is unfavourable for cavitation erosion resistance. Micro-twins considered at the origin of damping mechanisms seem to be favourable to the erosion resistance. Strain hardening capacity, ductility and fatigue limit of the matrix phase are the most important parameters to control cavitation erosion resistance of high damping alloys.