2009/SiC/15p PM Based Discontinuously Reinforced Aluminum (DRA) Critical Rotating Parts for Commercial Helicopters

摘要

2009/SiC/15p DRA blade sleeve forgings have been successfully introduced into service on Eurocopter commercial helicopters. The 2009 alloy DRA was selected for this critical rotating part because of its superior fatigue resistance compared to conventional aluminum and weight savings compared to titanium. The core of this presentation will consist of a description of primary billet fabrication, extrusion and forging secondary processing, and quality assurance requirements. With respect to quality assurance, the three primary areas of importance are 1) the selection and management of raw materials, 2) billet process control, and 3) material qualification for billet, extrusion, and forging. The static and dynamic mechanical properties of the various product forms will be presented. Additionally, physical properties in the form of micro and macro-structure as evaluated by metallography and ultrasonic inspection, electrical conductivity, and density will be discussed.