Microstructural Control in Multi-Ti-Alloy Components using Laser Metal Deposition

aerospace or biomedical applications due to its unique capabilities and potential cost savings. Direct energy deposition in particular allows geometrical freedom and the ability to locally control composition and adapt processing parameters. This project aims to apply powder based direct energy deposition of titanium alloys in order to control microstructure and composition of components suitable for aerospace applications. Such modifications could then be used to enhance mechanical properties overall and locally induce optimised adaptations. In the first part of this thesis the effects of processing parameters of the BeAM Magic 800 on porosity, microstructure and properties of titanium alloys are investigated. The second part focusses on titanium alloy combinations. The technology allows the deposition of near net shape and multi-material builds in a single step, which eliminates additional steps like welding and minimises machining needs. Different types of transitions between five different titanium alloys, and different classes, are analysed in detail with regards to microstructural and compositional evolution and mechanical properties. Finally, sophisticated patterns of multi-alloy components are designed, printed and evaluated for potential future work.