University of Oulu

Kamali, M. R., Mashreghi, A. R., Karjalainen, L. P., Hasani, S., Javaheri, V., & Kömi, J. (2020). Influence of microstructure and texture evolution on magnetic properties attained by annealing of a cold-rolled Fe-Co-10V semi-hard magnetic alloy. Materials Characterization, 169, 110591. https://doi.org/10.1016/j.matchar.2020.110591

Influence of microstructure and texture evolution on magnetic properties attained by annealing of a cold-rolled Fe-Co-10V semi-hard magnetic alloy

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Author: Kamali, M. R.1; Mashreghi, A. R.1; Karjalainen, L. P.2;
Organizations: 1Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
2Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, FI-90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 5.3 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2022020217393
Language: English
Published: Elsevier, 2020
Publish Date: 2022-08-27
Description:

Abstract

Typically, in processing of Fe-Co-V type magnetic alloys, hot rolled sheets are being severely cold rolled and then annealed at a specific temperature for an appropriate soaking time. In this work, in order to achieve the optimal magnetic properties, effect of various annealing cycles after 86% cold rolling on a 40Fe-50Co-10V (wt%) alloy were examined and the correlation between magnetic properties and microstructure and texture evolution was investigated. In order to supplement extensive microstructure evolution data available from previous publications, texture analysis was carried out using X-ray and electron backscatter diffraction methods and magnetic properties were determined via a vibrating sample magnetometer. It was observed that by increasing the annealing temperature the saturation magnetization decreased due to the formation of paramagnetic (Co,Fe)3V precipitates and austenite, while the coercivity increased in a reverse manner. The impact of austenite on decreasing the saturation magnetization was more pronounced than that of precipitates. Phase boundaries were more effective than grain boundaries in promoting the coercivity. However, nano-size (Co,Fe)3V precipitates inside the ferromagnetic matrix were also important in enhancing the coercivity. Besides formation of the precipitates, variations of the intensity of 〈111〉 direction as hard magnetic direction and intensity of {111}〈112〉 texture component, led to the alteration of magnetic remanence attained at 500–750 °C. Based on application of these alloys as semi hard and hard magnets, the optimal magnetic properties are achieved at a temperature range of 550–650 °C.

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Series: Materials characterization
ISSN: 1044-5803
ISSN-E: 1873-4189
ISSN-L: 1044-5803
Volume: 169
Article number: 110591
DOI: 10.1016/j.matchar.2020.110591
OADOI: https://oadoi.org/10.1016/j.matchar.2020.110591
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: MRK is grateful for financial support from the Iranian government for his research stay at the University of Oulu and for facilities and equipment provided by the University of Oulu for performing this study. LPK, VJ and JK acknowledge the support of the Academy of Finland for the “Genome of Steel” project #311934.
Academy of Finland Grant Number: 311934
Detailed Information: 311934 (Academy of Finland Funding decision)
Copyright information: © 2020 Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/