| About this Abstract |
| Meeting |
3rd World Congress on High Entropy Alloys (HEA 2023)
|
| Symposium
|
HEA 2023
|
| Presentation Title |
Direct Determination of Short-range Order in Materials Using Spatial Statistics |
| Author(s) |
Michael Xu, Shaolou Wei, Cemal C Tasan, James M LeBeau |
| On-Site Speaker (Planned) |
Michael Xu |
| Abstract Scope |
While short-range order (SRO) in chemistry and structure can have significant impact on material properties, capturing their distribution at the nanoscale can be inherently difficult. Scanning transmission electron microscopy (STEM) offers a local probe of material chemistry and structure, yet projection of the three-dimensional structure being imaged presents its own challenges in distinguishing SRO from local random fluctuations. Using a combination of STEM and Geographic Information Systems (GIS), we demonstrate first how incorporating spatial statistics tools can enable quantification of SRO at the atomic scale. We will consider a case study oxide material to validate the approach and extend it to measure non-random SRO in the refractory high entropy alloy TiVNbHf. Comparing experiment with null-hypothesis random and ordered structures shows that chemical order exists at extremely local length scales (<1 nm). Finally, the addition of Al is demonstrated to enhance the degree of SRO as well. |
| Proceedings Inclusion? |
Planned: Metallurgical and Materials Transactions |