New instrument for continuous and simultaneous recording of changes in ultrasonic attenuation and velocity

The study of microplasticity of pure single crystals at low temperatures (i.e., the study of the first movements of dislocations) implies the measurement of elastic and anelastic characteristics during tensile tests. Hence a new method has been developed for continuous and simultaneous recording of...

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Bibliographic Details
Published inReview of scientific instruments Vol. 49; no. 2; p. 238
Main Authors Odru, R, Riou, C, Vacher, J, Deterre, P, Peguin, P, Vanoni, F
Format Journal Article
LanguageEnglish
Published United States 01.02.1978
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Summary:The study of microplasticity of pure single crystals at low temperatures (i.e., the study of the first movements of dislocations) implies the measurement of elastic and anelastic characteristics during tensile tests. Hence a new method has been developed for continuous and simultaneous recording of changes in ultrasonic attenuation and velocity. The attenuation measurement is obtained by the usual pulse-echo technique. The relative velocity measurement is obtained by automatic comparison between a reference square pulse and the attack front of a selected echo. The relative accuracy is 6x10(-6) with a sensitivity of 30 mV ns(-1) for frequencies up to 40 MHz. Application to dislocation studies in aluminium is reported.
ISSN:0034-6748
DOI:10.1063/1.1135375