|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High Entropy Alloys IV
||The Use of Diffusion Multiples to Explore the Phase Equilibria, Diffusion, and Nano-Mechanical Behavior of CoCrFeMnNi High Entropy Alloys
||Paul Wilson, Michael Kaufman, Andre Costa e Silva, Robert Field
|On-Site Speaker (Planned)
One of the primary obstacles to the development of useful high entropy alloys (HEAs) is the very large number of compositions available to study. For example, hundreds of thousands of five-component HEAs exist with no efficient means of evaluating them. In this study, Co-Cr-Fe-Mn-Ni diffusion multiples have been explored in an effort to address this problem. Significantly, complex structures were observed at the diffusion multiple interfaces; these were examined using SEM, EDS, site-specific TEM, and nanoindentation. Computational thermodynamics was used to model these couples since, if successful, this could be a method to explore the large HEA composition space. The results appear promising and the unusually large Cr diffusion distances observed experimentally were modeled successfully using Thermo-Calc® and DICTRA. Finally, nanoindentation was performed in interdiffusion zones in order to examine the hypothesized “super” solid solution effect. This work was conducted with the NSF-IURC Center for Advanced Non-Ferrous Structural Alloys.
||Planned: A print-only volume