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Quantitative three-dimensional imaging of chemical short-range order via machine learning enhanced atom probe tomography
oleh: Yue Li, Ye Wei, Zhangwei Wang, Xiaochun Liu, Timoteo Colnaghi, Liuliu Han, Ziyuan Rao, Xuyang Zhou, Liam Huber, Raynol Dsouza, Yilun Gong, Jörg Neugebauer, Andreas Marek, Markus Rampp, Stefan Bauer, Hongxiang Li, Ian Baker, Leigh T. Stephenson, Baptiste Gault
| Format: | Article |
|---|---|
| Diterbitkan: | Nature Portfolio 2023-11-01 |
Deskripsi
Abstract Chemical short-range order (CSRO) refers to atoms of specific elements self-organising within a disordered crystalline matrix to form particular atomic neighbourhoods. CSRO is typically characterized indirectly, using volume-averaged or through projection microscopy techniques that fail to capture the three-dimensional atomistic architectures. Here, we present a machine-learning enhanced approach to break the inherent resolution limits of atom probe tomography enabling three-dimensional imaging of multiple CSROs. We showcase our approach by addressing a long-standing question encountered in body-centred-cubic Fe-Al alloys that see anomalous property changes upon heat treatment. We use it to evidence non-statistical B2-CSRO instead of the generally-expected D03-CSRO. We introduce quantitative correlations among annealing temperature, CSRO, and nano-hardness and electrical resistivity. Our approach is further validated on modified D03-CSRO detected in Fe-Ga. The proposed strategy can be generally employed to investigate short/medium/long-range ordering phenomena in different materials and help design future high-performance materials.