The role of open-volume defects in the annihilation of antisites in a B2-ordered alloy
作者： Jonathan Ehrler , Maciej Oskar Liedke , Jakub Čížek , Richard Boucher , Maik Butterling
DOI: 10.1016/J.ACTAMAT.2019.06.037
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摘要: Abstract The atomic arrangement in certain ordered alloys, such as B2–Fe60Al40 determines intrinsic material properties for instance, the saturation magnetization. Here we have investigated influence of open-volume defects on ordering process at elevated temperatures Fe60Al40 thin films. A dependence type and concentration is observed by positron annihilation spectroscopy combined with ab-initio calculations. Comparing lifetimes positrons alloy different annealing irradiation treatments reveals role mono-vacancies, triple well large vacancy clusters: rate to B2 state increased presence mono-vacancies whereas complexes decrease rate. Furthermore, an agglomeration vacancies during di-vacancies larger clusters observed. distribution can be modified a way control thermal stability via ion-irradiation pre-treatments.
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