Octapod-shaped,nanosized, amorphous precipitates in a crystalline ferrite matrix |
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| Authors: | Sai Ramudu Meka Ewald Bischoff Bastian Rheingans Eric Jan Mittemeijer |
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| Institution: | 1. Max Planck Institute for Intelligent Systems (formerly Max Planck Institute for Metals Research), Heisenbergstrasse 3 , Stuttgart , D-70569 , Germany s.meka@is.mpg.de;3. Max Planck Institute for Intelligent Systems (formerly Max Planck Institute for Metals Research), Heisenbergstrasse 3 , Stuttgart , D-70569 , Germany;4. Institute for Materials Science, University of Stuttgart , Stuttgart , Germany;5. Max Planck Institute for Intelligent Systems (formerly Max Planck Institute for Metals Research), Heisenbergstrasse 3 , Stuttgart , D-70569 , Germany;6. Institute for Materials Science, University of Stuttgart , Stuttgart , Germany |
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| Abstract: | The development of uniquely octapod-shaped nanosized amorphous silicon–nitride precipitates in a ferrite matrix was observed upon nitriding of Fe–4.5at.%Si alloy. The legs of the amorphous precipitate are oriented along ?1?1?1?-directions of the ferrite. The occurrence of such peculiarly shaped amorphous silicon–nitride precipitates, which experience a volume misfit of more than 100% with the surrounding ferrite, was attributed to precipitate growth influenced by long-range diffusion within the evolving highly anisotropic stress field around the developing precipitates after nucleation. |
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| Keywords: | octapod-shape amorphous-precipitate silicon–nitride elastic-anisotropy nitriding |
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