Correlation between microstructure, magnetic properties and mechanical behavior of the Permimphy alloy after high-pressure torsion

This study investigates the correlation between coercivity ( H c ), grain size ( d ), and dislocation density in the Permimphy alloy (Fe–80%Ni–6%Mo). The samples used in this study were subjected to varying levels of applied strain through processing by high-pressure torsion. The microstructure and...

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Veröffentlicht in:Journal of materials science 2024-04, Vol.59 (14), p.5968-5980
Hauptverfasser: Dabou, Oussama, Baudin, Thierry, Brisset, François, Waeckerlé, Thierry, Ateba Betanda, Yanick, Huang, Yi, Helbert, Anne-Laure, Bradai, Djamel, Langdon, Terence G.
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Sprache:eng
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Zusammenfassung:This study investigates the correlation between coercivity ( H c ), grain size ( d ), and dislocation density in the Permimphy alloy (Fe–80%Ni–6%Mo). The samples used in this study were subjected to varying levels of applied strain through processing by high-pressure torsion. The microstructure and the magnetic coercivity were analyzed using a scanning electron microscope, electron backscatter diffraction and vibrating sample magnetometry. The grain size of the samples varied from 30 to 190 nm. This study demonstrated a strong correlation between H c and microhardness when d  > 3 µm. The results show that the coercivity of the Permimphy alloy follows an inverse V-shape with respect to grain size. The coercivity of the samples decreased despite increasing the dislocation density and the hardness when d  
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-024-09490-y