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Phase separation and nanocrystallization in Al92Sm8 metallic glass |
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| Authors: | J Antonowicz A R Yavari W J Botta¶ P Panine |
| Institution: | 1. Faculty of Physics , Warsaw University of Technology , Koszykowa 75, 00-662 Warsaw, Poland antonowi@if.pw.edu.pl;3. Institut National Polytechnique de Grenoble (LTPCM-CNRS umr 5614) , 1130 Rue de la Piscine, BP 75, 38402 St-Martin-d’Hères Campus, France;4. European Synchrotron Radiation Facility , 38042 Grenoble, France |
| Abstract: | Crystallization of Al92Sm8 metallic glass was investigated in situ using combined small-angle and wide-angle X-ray scattering (SAXS/WAXS) techniques during isothermal annealing at temperatures close to crystallization point. A continuously growing interference maximum shifting progressively towards lower angles was found to develop in SAXS regime. Simultaneously taken WAXS spectra reveal formation of fcc-Al nanocrystalline phase. The analysis of the SAXS/WAXS data indicate that amorphous phase separation is responsible for the nanocrystalline microstructure formation. The primary fcc-Al crystals nucleate inside the Al-rich amorphous regions formed during alloy decomposition and their growth is constrained by the region size. |
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