In situ phase changes in a Fe-40 at.% Al ordered alloy during ion implantation: T.E.M. study |
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| Authors: | J. P. Riviere M. O. Ruault M. Schack J. Chaumont |
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| Affiliation: | 1. Laboratoire de Métallurgie Physique , L.A. 131 du CNRS, 40 avenue du Recteur Pineau, 86022, Poitiers , France;2. Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse , Bat. 108, B.P. No 1, 91406, Orsay , France |
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| Abstract: | The radiation damage and disordering phenomena produced at room temperature during Fe+, Bi++ and Xe+ ion implantations in a Fe-40 at.% A1 ordered alloy were studied by in situ transmission electron microscopy. Progressive, but not total disordering was achieved in the thinnest areas of the specimens during high fluence implantations (> 1015 ions/cm2). Simultaneously, the athermal formation of a new phase occurs in the case of Fe+ and Bi++ implantations. The diffusion-less mechanism suggests a martensitic like transformation. During post-implantation annealing, reordering and long-range order domain growth occurred in the temperature range up to 570 K. Above 670 K another phase appeared, which was stable up to 1070 K. The results are discussed and compared with those obtained on melt-quenched or neutron irradiated specimens of the same alloy. |
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| Keywords: | Key words transient absorption self-trapped exciton Frenkel defects potential barrier cation impurity KCl-Na. |
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