Campus Units

Electrical and Computer Engineering, Materials Science and Engineering, Ames Laboratory, Center for Nondestructive Evaluation

Document Type

Article

Publication Date

8-2002

Journal or Book Title

Materials Evaluation

Volume

60

Issue

8

First Page

971

Last Page

975

Abstract

Pulsed magnetic treatment has been suggested as a nondestructive treatment of magnetic materials for reducing microscopic stress and strain in the materials. Systematic studies have been made to test the effect of pulsed magnetic field treatments in a variety of magnetic materials including bulk nickel and magnetic thin film samples. The treatment involves the application of a low frequency, periodic magnetic field superimposed with a high frequency pulse component followed by demagnetization. Equipment for applying the pulsed magnetic field treatment has been designed and constructed, together with computer software which was developed to allow complete control of the waveform, frequency and amplitude of the pulsed magnetic field profile. Various characterization techniques, including magnetic hysteresis, Barkhausen effect measurements and magnetic force microscopy, were used to test the effects of the pulsed magnetic field treatment. Present results indicate that the stress relief effect of the treatment on the samples, if there is any, is much weaker than claimed in previous studies.

Comments

This is an article from Materials Evaluation 60 (2002): 971. Posted with permission.

Copyright Owner

American Society for Nondestructive Testing

Language

en

File Format

application/pdf

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