"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.
Clark, J. B. (J. Beverley)
Weart, H. W. (Harry Waldron), 1927-
Tefft, Wayne E., 1929-1973
Sorrell, Charles A.
Materials Science and Engineering
Ph. D. in Metallurgical Engineering
U. S. Atomic Energy Commission
American Iron and Steel Institute
University of Missouri--Rolla
vii, 28 pages
© 1973 Bryce Linn Shriver, All rights reserved.
Dissertation - Open Access
Strains and stresses
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Shriver, Bryce Linn, "Premartensitic elasticity of Fe-Ni Invars" (1973). Doctoral Dissertations. 253.