Composition-dependent variation of magnetic properties and interstitial ordering in homogeneous expanded austenite
| Autor: | Kenny Ståhl, Mikkel Fougt Hansen, Thomas Lundin Christiansen, Cathrine Frandsen, Bastian Brink, Marcel A. J. Somers |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics Low temperature surface hardening Analytical chemistry chemistry.chemical_element 02 engineering and technology engineering.material 01 natural sciences Paramagnetism 0103 physical sciences Gas nitriding Austenitic stainless steel 010302 applied physics Austenite Mössbauer spectroscopy Metallurgy Metals and Alloys Magnetostriction 021001 nanoscience & nanotechnology Nitrogen Electronic Optical and Magnetic Materials Expanded austenite Ferromagnetism chemistry Ceramics and Composites engineering Curie temperature 0210 nano-technology Nitriding |
| Zdroj: | Brink, B K, Ståhl, K, Christiansen, T L, Frandsen, C, Hansen, M F & Somers, M A J 2016, ' Composition-dependent variation of magnetic properties and interstitial ordering in homogeneous expanded austenite ', Acta Materialia, vol. 106, pp. 32-39 . https://doi.org/10.1016/j.actamat.2015.12.043 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2015.12.043 |
| Popis: | The crystal structure and magnetic properties of austenitic stainless steel with a colossal interstitial content, so-called expanded austenite, are currently not completely understood. In the present work, the magnetic properties of homogeneous samples of expanded austenite, as prepared by lowerature nitriding of thin foils, were investigated with magnetometry and Mössbauer spectroscopy. At room temperature, expanded austenite is paramagnetic for relatively low and for relatively high nitrogen contents (yN = 0.13 and 0.55, respectively, where yN is the interstitial nitrogen occupancy), while ferromagnetism is observed for intermediate nitrogen loads. Spontaneous volume magnetostriction was observed in the ferromagnetic state and the Curie temperature was found to depend strongly on the nitrogen content. For the first time, X-ray diffraction evidence for the occurrence of long-range interstitial order of nitrogen atoms in expanded austenite was observed for high nitrogen contents. |
| Databáze: | OpenAIRE |
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