|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Accelerated Analysis of Beta Phase Ti-Nb-Al Ternary Diffusion via Optimization Fitting of Interdiffusion Coefficients in Three-Alloy Diffusion Multiples
||James Haley, Kaka Ma, Aparna Tripathi, Kaustubh Kulkarni, Anil Sachdev, Enrique Lavernia
|On-Site Speaker (Planned)
A new approach is proposed to investigate composition dependent ternary interdiffusion coefficients in solid systems for an extensive part of a single-phase field in a ternary isotherm with a single diffusion multiple experiment. The present work aims to explore the feasibility of using optimization as an accelerated analysis tool for studying ternary diffusion. A diffusion multiple consisting of three terminal single-phase alloys is fabricated to obtain concentration profiles in diffusion zones, which form a triangle region in the ternary composition space. Interdiffusion coefficients are represented with a series of composition dependent parameters which are optimized to minimize differences in the composition profiles of the simulated and experimental data. First, the approach is evaluated against concentration profiles generated with a hypothetical set of interdiffusion coefficients. Subsequently, the optimization fitting is applied to experimental data from a diffusion multiple in the high temperature body-centered-cubic (BCC) beta phase in the Ti-Nb-Al system.
||Planned: Supplemental Proceedings volume