About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Characterization of Minerals, Metals and Materials 2022
|
Presentation Title |
Analysis of MoNbTi and HfNbTaTiZr Refractory High Entropy Alloys by Atom Probe Tomography |
Author(s) |
Patrick Gregory Callahan, David Beaudry, Keith Knipling |
On-Site Speaker (Planned) |
Patrick Gregory Callahan |
Abstract Scope |
High entropy alloys (HEAs) have a significantly expanded composition space from traditional alloys as they are composed of multiple principal elements. There are numerous novel alloys to study given the large composition space of HEAs, and still a number of fundamental questions need to be addressed regarding properties in HEAs, such as plasticity and the mechanisms of dislocation motion, and diffusion. Atom probe tomography enables the accurate observation of the composition and morphology from targeted regions of materials and microstructural features near the atomic scale from ~200x200x100 nm3 volumes. In this study, the multi-hit detection events in two refractory HEAs, MoNbTi and HfNbTaTiZr, were analyzed. Multi-hit events comprise a significant number of detected ions in these alloys, for example ~35 - 40% of Mo and Nb ions that are collected. The consequences of these multi-hit events on quantitative APT measurements in these alloys will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, High-Entropy Alloys, Other |