Invar behavior of NANOPERM-type amorphous Fe–(Pt)–Zr–Nb–Cu–B alloys
| Autor: | Monika Osyra, J. Zbroszczyk, J. Rzącki, A. Łukiewska, Katarzyna Błoch, J. Gondro, W.H. Ciurzyńska, J. Świerczek, Jacek Olszewski |
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| Rok vydání: | 2013 |
| Předmět: |
Amorphous metal
Materials science Condensed matter physics Magnetic structure Annealing (metallurgy) Alloy Atmospheric temperature range engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials Amorphous solid Condensed Matter::Materials Science engineering Curie temperature Invar |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 341:100-107 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2013.04.009 |
| Popis: | Transmission Mossbauer spectra of amorphous Fe86Zr7Nb1Cu1B5, Fe81Zr7Nb1Cu1B10 and Fe81Pt5Zr7Nb1Cu1B5 alloys in the as-quenched state and subjected to the accumulative annealing for 15 min in the temperature range from 573 K up to 750 K are presented. After these heat treatments the alloys remain in the amorphous state. The accumulative annealing for 15 min at 573 K and then 600 K of the Fe86Zr7Nb1Cu1B5 and Fe81Zr7Nb1Cu1B10 alloys causes the narrowing of the transmission Mossbauer spectra as compared to the as-quenched state and the decrease of the average hyperfine field induction which is connected with the invar effect. For similar behavior in Fe81Pt5Zr7Nb1Cu1B5 alloy the accumulative annealing up to 700 K is needed. With further increase of the annealing temperature up to 750 K the broadening of the Mossbauer spectra and the increase of the average hyperfine field induction occur. The lowest value of the average hyperfine field induction of amorphous samples is accompanied by the lowest value of the Curie temperature. The investigated amorphous alloys do not reach the magnetic saturation up to the magnetizing field of 2 T and the coefficient in Holstein–Primakoff term is about one order in magnitude larger than in other classical FeCo-based amorphous alloys due to the non-collinear magnetic structure. The Mossbauer spectra and hysteresis loops of the amorphous Fe86Zr7Nb1Cu1B5 alloy in the as-quenched state and after the accumulative annealing at 573+620 K for 15 min are sensitive to the tensile stresses subjected to the sample. Such behavior is ascribed to the invar anomalies. |
| Databáze: | OpenAIRE |
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