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Influence of Dislocation Substructure on Ultrasonic Velocity under Tensile Deformation  

Kim, C.S. (Engineering Science and Mechanics, Pennsylvania State University)
Lissenden, Cliff J. (Engineering Science and Mechanics, Pennsylvania State University)
Kang, Kae-Myhung (Department of Materials Science and Engineering, Seoul National University of Technology)
Park, Ik-Keun (Department of Mechanical Engineering, Seoul National University of Technology)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.28, no.6, 2008 , pp. 477-482 More about this Journal
Abstract
The influence of dislocation substructure of metallic materials on ultrasonic velocity has been experimentally investigated. The test materials of pure Cu, brass (Cu-35Zn), 2.25Cr-1Mo steel, and AISI 316 with different stacking fault energy (SFE) are plastically deformed in order to generate dislocation substructures. The longitudinal wave velocit $(C_L)$ decreases as a function of tensile strain in each material. The $C_L$ of Cu-35Zn and AISI 316 decreases monotonously with tensile strain, but $C_L$ of Cu and 2.25Cr-1Mo steel shows plateau phenomena due to the stable dislocation substructure. The variation of ultrasonic velocity with the extent of dislocation damping and dislocation substructures is discussed.
Keywords
Ultrasonic Velocity; Dislocation Substructure; Stacking Fault Energy; Dislocation Damping;
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Times Cited By KSCI : 1  (Citation Analysis)
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