Linking microstructure and mechanical properties on different length scales for near gamma-TiAl alloys

Abstract

TiAl-alloys exhibit complex microstructures, which involve in so called “lamellar” or “duplex” alloys as characteristic feature grain like lamellar colonies with lamellae consisting of alpha2-Ti3Al and gamma-TiAl and, depending on composition, processing route, and thermal treatment possibly additional grain structures and phases. Mechanical properties are controlled by these microstructural features. However, it is sometimes difficult to link specific microstructures on micro- and nanometer level with macroscopic mechanical properties based on material physics knowledge. In this contribution we show for distinctive microstructures of a near gamma-TiAl alloy how experimental methods on the nano- and micro scale are used to predict macroscopic mechanical properties by means of numerical modeling and simulation.