Forging of Titaniumaluminide Parts

摘要

A new material is available that displays the high temperature mechanical properties of nickel alloys at half the density - the intermetallic Titaniumaluminides. These extraordinary properties give it great potential for lightweight construction in aeroengines. The high Young's modulus compared to common Titanium alloys offers advantages even in light weight applications, which do not need high heat resistance, e.g. connection rods. However, its characteristic rather like ceramics than metals presents a challenge in terms of forming. A forging technology has been developed with respect to this behaviour. Using isothermal forging at high temperatures with extremely low strain rates allows a material related forming. High pressure compressor blades and low pressure turbine blades have been forged as well as con rod for sports car engines. For economical improvement several blades may be forged at the same time.