Detection of the onset of nanocrystallization by calorimetric and magnetic measurements
It is generally accepted that measurements of the magnetic properties are more sensitive than measurements of the enthalpy changes in the detection of the onset of crystallization of ferromagnetic phases emerging from a paramagnetic amorphous alloy. In this work, it is shown that the formation of a...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2005 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/33385 |
| Acceso en línea: | http://hdl.handle.net/11441/33385 https://doi.org/10.1063/1.1849826 |
| Access Level: | acceso abierto |
| Palabra clave: | Field dependence Magnetization signals Thermomagnetic gravimetry (TMG) Vibrating sample magnetometer (VSM) Calorimeters Gravimetric analysis Magnetic properties Magnetometers Matrix algebra Melt spinning Microstructure Superalloys Vitrification Volume fraction Nanostructured materials |
| Sumario: | It is generally accepted that measurements of the magnetic properties are more sensitive than measurements of the enthalpy changes in the detection of the onset of crystallization of ferromagnetic phases emerging from a paramagnetic amorphous alloy. In this work, it is shown that the formation of a very fine nanocrystalline microstructure can make this assumption incorrect. Under some circumstances, the nanocrystallization onset temperature obtained from magnetic techniques is higher than the one obtained from enthalpy changes. The phenomenon is explained in terms of the superparamagnetic behavior of the uncoupled nanocrystals at the very early stages of nanocrystallization |
|---|