The Influence of Metal Grain Structure on the Attenuation of an Ultrasonic Acoustic Wave

Author: Roney, Robert Kenneth

Year: 1950

Degree: Dissertation (Ph.D.)

Advisor: Lindvall, Frederick C.

Committee Member: Unknown, Unknown

Option: Electrical Engineering; Physics

DOI: 10.7907/V3FK-SM37

Abstract

Apparatus is described for the study of the propagation of ultrasonic acoustic waves in solid bodies and its applications in metallurgy. In particular, the anisotropy of attenuation in cold worked aluminum and the effect of anneal are demonstrated. Reflections from individual crystal faces are identifiable in bodies with average grain diameter of 0.17 mm. A critical discussion is given of a theoretical effect of grain size on wave attenuation as advanced by Mason and McSkimin(9), and an empirical relation reported by Roth(7). The theory is extended to cover the complete range from that explored by Mason to that reported by Roth. Experimental deviation from the theoretical effect indicates other factors besides average grain size are effective in materials with asymmetrical grain structure.

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