Determination of short-range order in TiVNbHf(Al)
Name
181901_1_5.0145289.pdf
Description
Published version
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2.43 MB
Format
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Checksum (MD5)
c4f90bb96aa709401f29421f4342aa23
Author(s)
Xu, Michael
Wei, Shaolou
Tasan, C Cem
LeBeau, James M
Date Issued
May 1, 2023
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Michael Xu, Shaolou Wei, C. Cem Tasan, James M. LeBeau; Determination of short-range order in TiVNbHf(Al). Appl. Phys. Lett. 1 May 2023; 122 (18): 181901.
Version
Final published version
Abstract
The presence of short-range chemical order can be a key factor in determining the mechanical behavior of metals, but directly and unambiguously determining its distribution in complex concentrated alloy systems can be challenging. Here, we directly identify and quantify chemical order in the globally single phase BCC-TiVNbHf(Al) system using aberration corrected scanning transmission electron microscopy (STEM) paired with spatial statistics methods. To overcome the difficulties of short-range order (SRO) quantification with STEM when the components of an alloy exhibit large atomic number differences and near equiatomic ratios, “null hypothesis” tests are used to separate experiment from a random chemical distribution. Experiment is found to deviate from both the case of an ideal random solid solution and a fully ordered structure with statistical significance. We also identify local chemical order in TiVNbHf and confirm and quantify the enhancement of SRO with the addition of Al. These results provide insight into local chemical order in the promising TiVNbHf(Al) refractory alloys while highlighting the utility of spatial statistics in characterizing nanoscale SRO in compositionally complex systems.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1063/5.0145289
