Microstructure and Magnetic Properties of Two Phase β+γ Ferromagnetic Co-Ni-Al Alloys

Abstract:

The microstructure, texture and magnetic properties of two ferromagnetic alloys of composition Co35Ni37Al28 and Co37Ni35Al28 (in at. %) were investigated with optical microscopy (OM), analytical transmission electron microscopy (TEM), scanning electron microscopy (SEM) techniques as well as a vibrating sample magnetometer (VSM). The alloys were plastically deformed and heat treated in order to promote the martensitic transformation. Differential scanning calorimetry (DSC) revealed a drop of Ms temperature due to the increase of Co content in the alloys. The elongated twinned grains of size about 200 m and small precipitates of  phase were identified with the OM techniques. The TEM observations showed the twinned L10 non modulated martensite within the elongated grains and a small amount of ordered ’ phase after the heat treatment. The chemical composition of different martensite grains was established using point analyses of a HAADF-EDS technique. The magnetic phase transition temperatures were determined on the deformed samples using VSM method.

• Periodical: Solid State Phenomena (Volume 154)
• Pages: 145-150
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.154.145
• Online since: April 2009
• Authors: Wojciech Maziarz, Jan Dutkiewicz, Rafał Wróblewski, Marcin Leonowicz
• Keywords: Co-Ni-Al Ferromagnetic Alloy, Magnetic Property, SEM Structure, TEM, Texture, Two-Phase Structure

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