| Issue |
J. Phys. Colloques
Volume 42, Number C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-1061 - C5-1065 | |
| DOI | https://doi.org/10.1051/jphyscol:19815164 | |
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-1061-C5-1065
DOI: 10.1051/jphyscol:19815164
1 Physics Department and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, U.S.A.
2 Xerox Research Laboratory, Webster New York, U.S.A.
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-1061-C5-1065
DOI: 10.1051/jphyscol:19815164
ULTRASONIC ATTENUATION AND VELOCITY CHANGES DURING THE FCC-HCP MARTENSITIC TRANSFORMATION IN COBALT-NICKEL
G.A. Kneezel1, 2 et A.V. Granato11 Physics Department and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, U.S.A.
2 Xerox Research Laboratory, Webster New York, U.S.A.
Abstract
Measurements were made to search for evidence of widening of extended dislocations as the transformation temperature is approached in a single crystal Co68Ni32 alloy. Specimens were prestressed plastically in shear to introduce dislocations primarily on one slip system. During transformation, measurements were made of longitudinal and shear strain as well as velocity and attenuation at 10 MHz. The sound waves were polarized to excite the "optical" mode of vibration of the two partial dislocations using a (111) [11[MATH]] polarization shear wave. Pre-transformation changes were found which are consistent with a simple model for the effect.