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Abstract
In this paper, we report on the influence of rapid solidification and severe plastic deformation on the solid solubility of Fe in Al. Atom probe tomography, for the first time, was performed on fine (3–4 μm diameter) and coarse (~100 μm) as-atomised Al-5 at.% Fe powder and cryomilled Al-5 at.% Fe powder. The atomised powders exhibited negligible Fe in solution with Al, whereas the cryomilled powder contained ~2 at.% Fe in solution. Moreover, our results suggest that severe plastic deformation is preferable to atomisation/rapid solidification for increasing the non-equilibrium solid solubility of Fe in Al.
Acknowledgements
The authors acknowledge financial support provided by the Office of Naval Research [grant number ONR N00014-12-1-0237] with Dr. Lawrence Kabacoff as program officer. We also thank the Australian Centre for Microscopy and Microanalysis at the University of Sydney, as well as the Chinese Center of Excellence for Atom Probe Tomography at Nanjing University of Science and Technology for kindly offering beam time and assistance on performing atom probe tomography analysis.