Masters Theses

Abstract

"Temperature dependent after-effects of the initial permeability in ternary dilute ferromagnetic iron-base alloys were studied in the temperature range of -50°C to +30°C. Interstitial carbon and nitrogen were the diffusing elements. Nominal percentages of the substitutional transition elements manganese, chromium, vanadium and titanium were added to determine the extent of substitutional-interstitial pair interactions. No additional temperature dependent after-effect of the initial permeability was noticed in Fe- substitutional -C alloys, while such after-effects were present in Fe- substitutional -N alloys. Magnetic after-effect data were analyzed on the basis of single Debye relaxations. Relaxation times for carbon and nitrogen diffusion in alpha-iron were calculated using activation energies of 20,100 cal/mole and 17,700 cal/mole, respectively. Magnetic after-effect data were discussed on the basis of additional strain components and electronic interactions caused by the variation of the substitutional elements. It was concluded that electronic interactions cause the extra disaccommodation in Fe- substitutional -N alloys while the larger lattice distortion around carbon renders the influence of the substitutional on the interstitial mobility ineffective"--Abstract, page ii-iii.

Advisor(s)

Wuttig, Manfred

Committee Member(s)

Weart, Harry W.
Day, D. E.

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology

Sponsor(s)

Alcoa Foundation

Publisher

University of Missouri at Rolla

Publication Date

1968

Pagination

vii, 33 pages

Note about bibliography

Includes bibliographical references (page 71).

Rights

© 1968 Robert Henry Graham, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Transition metal alloys -- Magnetic properties
Ferromagnetic materials
Magnetic fields

Thesis Number

T 2119

Print OCLC #

5995622

Electronic OCLC #

832380973

Included in

Geology Commons

Share

 
COinS