Doctoral Dissertations

Abstract

"The premartensitic temperature dependence of ultrasonic wave propagation in Fe-30 pct Ni polycrystals and Fe-32 pct Ni single crystals was measured by using a continuous wave technique. As the temperature was lowered to within 10°C of the Ms, a nonlinear decrease of the relative shear velocity was observed. This effect is related to dislocation stacking fault instabilities which may trigger the martensitic phase transformation. In addition, the single crystals show a frequency dependence of the shear elastic constant C' well above the Ms. The dispersion is believed to be caused by fluctuations in the anisotropic molecular field which precede the magnetic transformation which occurs with the formation of martensite"--Abstract, page iii.

Advisor(s)

Wuttig, Manfred

Committee Member(s)

Clark, J. B. (J. Beverley)
Weart, H. W. (Harry Waldron), 1927-
Tefft, Wayne E., 1929-1973
Sorrell, Charles A.

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Metallurgical Engineering

Sponsor(s)

U. S. Atomic Energy Commission
American Iron and Steel Institute

Publisher

University of Missouri--Rolla

Publication Date

1973

Pagination

vii, 28 pages

Note about bibliography

Includes bibliographical references (pages 16-18).

Rights

© 1973 Bryce Linn Shriver, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Martensitic transformations
Iron-nickel alloys
Strains and stresses

Thesis Number

T 2988

Print OCLC #

6024506

Electronic OCLC #

914234046

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Included in

Metallurgy Commons

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