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Influence of precipitates on the magnetic properties of Fe–Cr–Mo alloys studied by X-ray diffraction, Mössbauer spectroscopy and vibrating sample magnetometry

Published online by Cambridge University Press:  16 January 2017

Kleyton J. Camelo ,
Francisco C. Oliveira Junior ,
Manoel R. da Silva  and
Igor F. Vasconcelos
Kleyton J. Camelo*
Affiliation:
Department of Metallurgical and Material Engineering, Universidade Federal do Ceará, Fortaleza 60440-900, CE, Brazil
Francisco C. Oliveira Junior
Affiliation:
Department of Metallurgical and Material Engineering, Universidade Federal do Ceará, Fortaleza 60440-900, CE, Brazil
Manoel R. da Silva
Affiliation:
Institute of Physics and Chemistry, Universidade Federal de Itajubá, Itajubá 37500-903, MG, Brazil
Igor F. Vasconcelos
Affiliation:
Department of Metallurgical and Material Engineering, Universidade Federal do Ceará, Fortaleza 60440-900, CE, Brazil
*
a)Address all correspondence to this author. e-mail: jkfisica@gmail.com
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Abstract

X-ray diffraction (XRD), transmission Mössbauer spectroscopy, and vibrating sample magnetometry were used to study the influence of precipitates on the magnetic properties of aged Fe–Cr–Mo alloys. XRD patterns and Mössbauer spectra showed that the alloys have body-centered cubic structure similar to that of α-Fe. Small amounts of precipitates were also identified with relative fraction found to be related to Mo content, aging times, and temperatures. Magnetic measurements showed that the increase in the density of precipitates contributes significantly to the increase in the magnetic hardness of the material. This mechanism is related to a process of pinning of magnetic domain walls. It was also found that saturation magnetization is affected by the Mo content in the alloy. The techniques used in this work were shown to be very useful to understand the mechanisms through which the formation of precipitates affects the magnetic properties of the alloys and may be used as complement to the usual microscopy-based techniques for this purpose.

Keywords

magnetic propertiesmicrostructureMössbauer effect
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 7 , 14 April 2017 , pp. 1316 - 1323
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Michael E. McHenry

References

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