Artículo
Positron annihilation and transmission electron microscopy study of the evolution of microstructure in cold-rolled and nitrided FeNiTi foils
Autor/es | Chechenin, N.G.
Veen, A. van Escobar-Galindo, Ramón Schut, Henk Chezan, A.R. Bronsveld, P.M. |
Departamento | Universidad de Sevilla. Departamento de Física Aplicada I |
Fecha de publicación | 2001 |
Fecha de depósito | 2023-07-06 |
Publicado en |
|
Resumen | Positron beam analysis (PBA) and transmission electron microscopy (TEM) were applied to study structural transformations in cold-rolled Fe0.94Ni0.04Ti0.02 foils, which were subjected to different thermal treatments in an ... Positron beam analysis (PBA) and transmission electron microscopy (TEM) were applied to study structural transformations in cold-rolled Fe0.94Ni0.04Ti0.02 foils, which were subjected to different thermal treatments in an atmosphere of a gas mixture of NH3 + H2 (nitriding). Positrons proved to be sensitive probes for the microstructure evolution and formation of nitride precipitates. The nitriding of the samples in the α-region (αN) of the Lehrer diagram for the Fe-N system produced a large decrease of the central part of the Doppler broadened annihilation γ-peak (S-parameter) and an increase of the contribution to the wings of the peak (W-parameter). The effect, ascribed to replacing of vacancy type positron traps by nitride-related traps, was much more pronounced for the α-nitrided samples than for samples annealed in vacuum at the same temperature. A reduction of the αN samples by annealing in H2 atmosphere brings the S-parameter back to a higher value. Further nitriding of αN samples in the γ'-region (αN + γ'N) of the Lehrer diagram increases S and lowers the W-parameter compared with the αN samples. The changes in S- and W-parameters are interpreted on the basis of the evolution of microstructure of the films during the processing. |
Cita | Chechenin, N.G., Veen, A.v., Escobar-Galindo, R., Schut, H., Chezan, A.R. y Bronsveld, P.M. (2001). Positron annihilation and transmission electron microscopy study of the evolution of microstructure in cold-rolled and nitrided FeNiTi foils. Journal of Physics: Condensed Matter, 13 (26), 5937-5946. https://doi.org/10.1088/0953-8984/13/26/309. |
Ficheros | Tamaño | Formato | Ver | Descripción |
---|---|---|---|---|
N_G_Chechenin_2001_J._Phys.__C ... | 291.5Kb | [PDF] | Ver/ | |