Szczegóły publikacji
Opis bibliograficzny
Effect of titanium on the kinetics of the $\sigma$-phase formation in a small grain $Fe-Cr$ alloy / A. BŁACHOWSKI, J. CIEŚLAK, S. M. DUBIEL, J. ŻUKROWSKI // Journal of Alloys and Compounds ; ISSN 0925-8388. — 2000 — vol. 308 iss. 1–2, s. 189–192. — Bibliogr. s. 192, Abstr.
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Dane bibliometryczne
| ID BaDAP | 5337 |
|---|---|
| Data dodania do BaDAP | 2001-06-13 |
| Tekst źródłowy | URL |
| DOI | 10.1016/S0925-8388(00)00835-5 |
| Rok publikacji | 2000 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Alloys and Compounds |
Abstract
Using Mossbauer Spectroscopy the kinetics of the sigma-phase formation was studied in situ on Ti-doped quasi-equiatomic Fe-Cr alloys having an average grain size equal to 31(2) mu m. The kinetics was studied both with a traditional approach i.e. the amount of the sigma-phase precipitated, A(sigma), was determined from the spectral area, as well as with a novel approach i.e. in terms of the average isomer shift. In both cases the data could be well fitted in terms of the Johnson-Avrami-Mehl equation which yielded the kinetics parameters: the time constant, k, and the form factor, n. Assuming the k-values follow the Arrhenius law, the Ti-induced change in the activation energy, E, was determined. In particular, it was revealed that addition of 1.5 at% Ti or less accelerates the transformation, with the highest rate for 0.3 at% Ti, and the difference in E equals to 18.8 kJ/mol. In alloys with Ti-content higher than 1.5 at%, the formation of the sigma-phase was retarded. The value of E = 207 +/- 20 kJ/mol was found for the Fe53.8Cr46.2 alloy.
