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1 PublikationThe role of open-volume defects in the annihilation of antisites in a B2-ordered alloy
Ehrler, J.; Liedke, M. O.; Cizek, J.; Boucher, R.; Butterling, M.; Zhou, S.; Böttger, R.; Hirschmann, E.; Trinh, T. T.; Wagner, A.; Lindner, J.; Fassbender, J.; Leyens, C.; Potzger, K.; Bali, R.
Abstract
The atomic arrangement in certain B2-ordered alloys, such as Fe60Al40, determines intrinsic material properties like magnetism. Here we have investigated the influence of open-volume defects on the atomic ordering process at elevated temperatures in Fe60Al40 thin films. A dependence of the ordering process on the type and concentration of defects is observed by positron annihilation spectroscopy combined with ab-initio calculations. Comparing the lifetimes of positrons in the alloy for different annealing and irradiation treatments reveals the role of mono-vacancies, triple defects as well as large vacancy clusters: The rate of atomic ordering to the ordered B2 state is increased in the presence of mono-vacancies whereas triple defects and vacancy complexes decrease the ordering rate. Furthermore, an agglomeration of vacancies during annealing to di-vacancies and larger vacancy clusters is observed. The distribution of open-volume defects can be modified in such a way as to control the thermal stability via ion-irradiation and thermal pre-treatments.
Keywords: Order-disorder phenomena; Vacancies; Lattice defects; Reordering; Positron Annihilation Spectroscopy
Beteiligte Forschungsanlagen
- Strahlungsquelle ELBE DOI: 10.17815/jlsrf-2-58
- Ionenstrahlzentrum DOI: 10.17815/jlsrf-3-159
- P-ELBE
Verknüpfte Publikationen
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 28092) publication
- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 28092) publication
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Acta Materialia 176(2019), 167-176
DOI: 10.1016/j.actamat.2019.06.037
Cited 14 times in Scopus
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