|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Effects of Grain Orientation during Spark Plasma Sintering Beta Phase Ti-Al-Nb Alloys
||Stoney Middleton, Aparna Tripathi, James Haley, Kaustubh Narhar Kulkarni, Anil Sachdev, Enrique J Lavernia
|On-Site Speaker (Planned)
This study investigates the effects of electric current and pressure on binary diffusion in β (BCC) phase Ti-Nb. A combination of axial pressure and current is used in the Spark Plasma Sintering (SPS) system to consolidate powders, yet little research has been done on understanding the separate forces on diffusion. Experiments using the SPS and a custom electromigration furnace allow for comparison of activation energy using composition profiles. Electron Probe Micro Analysis (EPMA) is used to accurately measure composition profiles which are analyzed using the Matano - Boltzmann method to calculate diffusion coefficients. The thermodynamic data gained will lead to a better understanding of combined driving forces for diffusion when field assisted sintering apparatus are used to sinter titanium powders. The extent and character of the α to β phase transition is well known to be compositionally dependent which motivates the eventual modeling of the effective diffusion parameters derived from this work.
||Planned: Supplemental Proceedings volume