MAGNETOACOUSTIC AND BARKHAUSEN EMISSION FROM DOMAIN-WALL INTERACTIONS WITH PRECIPITATES IN INCOLOY-904
| Autor: | C.B. Scruby, J.P. Jakubovics, D.J. Buttle, G. A. D. Briggs |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Condensed matter physics Mechanical Engineering Alloy Metals and Alloys engineering.material Condensed Matter Physics Isothermal process Electronic Optical and Magnetic Materials Magnetic field Hysteresis Domain wall (magnetism) Nuclear magnetic resonance Volume fraction engineering Barkhausen stability criterion General Materials Science Magneto Incoloy |
| DOI: | 10.1080/01418618708214380 |
| Popis: | Magneto-acoustic emission (MAE) and Barkhausen emission (BE) have been measured from single crystals and polycrystals of Incoloy 904 alloy, in which a uniform, random distribution of coherent spherical precipitates (non-magnetic inclusions) forms on isothermal ageing. The volume fraction of these inclusions remains constant but their diameter can be varied by the length of the heat treatment. BE activity and MAE activity profiles were measured as a function of the magnetizing field, and the number of Barkhausen events were counted as a function of their peak amplitude for each of the Incoloy specimens. At magnetic fields corresponding to the ‘knee’ regions of the hysteresis loops, there is a peak in both the MAE and BE activities. This is believed to be due to domain-wall creation and annihilation. At low fields the BE activity shows a peak while the MAE activity is at a minimum. This peak in BE activity is predominantly due to the thermodynamically irreversible 180° domain-wall motion and its in... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|