|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Matrix Grain Refinement in Functionally Graded Ti-6Al-4V/TiB Composite Fabricated by LENS Additive Manufacture
||Denver Seely, Hongjoo Rhee, Mark Horstemeyer
|On-Site Speaker (Planned)
The blown powder method of metal additive manufacture provides access to a new design space for composites. By modulating the composition of the deposition melt pool through powder mixing, spatial variation of material properties can be achieved and be tailored in functionally advantageous arrangements. Mechanical properties of deposited titanium alloys are dominated by process dependent microstructure features; of central importance is initial solidification grain size. The eutectic solidification of titanium boride provides a compositionally controlled mechanism for refinement of matrix grain size. An analysis of a successful functionally graded composite fabricated by the LENS process is presented. Microstructural features are quantified by X-ray CT, EBSD, and EDS analysis. Mechanical properties are quantified by instrumented micro-indentation, quasi-static mechanical tests. Results demonstrate the range of flexibility within the titanium and boron system to implement functionally graded structures and establish a prototype for exploring new candidates for functionally graded material systems.
||Planned: Supplemental Proceedings volume