A study on the effect of dislocation on the magnetic properties of nickel using magnetic NDE methods

Thumbnail Image
Date
1987-04-15
Authors
Ranjan, R.
Buck, O.
Thompson, R.
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Research Projects
Organizational Units
Organizational Unit
Journal Issue
Is Version Of
Versions
Series
Department
Ames Laboratory
Abstract

Dislocations affect the magnetic properties of ferromagnetic materials by pinning the domain walls. The primary mechanism is interaction between the stress fields of dislocation and domain walls. Using magnetic nondestructive methods, namely the acoustic Barkhausen noise (AB), magnetic Barkhausen noise (MB), and the hysteresis curves, we have studied these interactions. The three measurements give different types of information. AB provides information about non‐180° type domain wall interaction, MB primarily provides information about 180° domain wall interaction, and the hysteresis curve about both these interactions as well as about rotation of domain walls. The paper presents results obtained on polycrystalline nickel which was first deformed and then annealed at different temperatures in order to achieve different dislocation densities. The results show that AB and hysteresis loss follow the same trend as hardness. MB results, however, change in a more complex fashion which is sensitive to grain recrystallization as well as dislocation structure. Interesting features of these results will be discussed in detail.

Comments

The following article appeared in Journal of Applied Physics 61, no. 8 (1987): 3196–3198 and may be found at http://dx.doi.org/10.1063/1.338899.

Description
Keywords
Citation
DOI
Copyright
Thu Jan 01 00:00:00 UTC 1987
Collections