Acoustic characterization of metals with long needle grains

Author

Jen, C.K. ; Soda, H. ; Liu, Y.S. ; Neron, C. ; Ohno, A. ; McLean, A.

Author_Institution

IMI, Nat. Res. Council, Boucherville, Que., Canada

fYear

1992

Firstpage

757

Abstract

Acoustic characterization measurements of Sn, Pb, Al, and Cu metallic alloys with highly oriented long needle grains are presented. Using a 225-MHz line-focus-beam scanning acoustic microscope, the ultrasonic anisotropy of a transversely isotropic symmetry for samples having small primary dendrite spacings (~ acoustic wavelength) samples is observed. The column grain structures induce unique acoustic propagation characteristics, such as focusing and diverging, which are illustrated in the guided longitudinal and shear acoustic wave pulse-echo measurements performed for rod geometries

Keywords

acoustic microscopy; aluminium; aluminium alloys; copper; copper alloys; lead; lead alloys; surface acoustic waves; tin; tin alloys; ultrasonic materials testing; ultrasonic velocity measurement; 225 MHz; Al; Al-Cu alloy; Cu; Pb; Sn; Sn-Pb alloy; acoustic characterisation; column grain structures; diverging; focusing; guided longitudinal waves; leaky SAW; line-focus-beam scanning acoustic microscope; long needle grains; metals; shear acoustic wave pulse-echo measurements; small primary dendrite spacings; transversely isotropic symmetry; ultrasonic anisotropy; Acoustic measurements; Acoustic waves; Aluminum alloys; Copper alloys; Microscopy; Needles; Pulse measurements; Tin; Ultrasonic variables measurement; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1992. Proceedings., IEEE 1992

Conference_Location

Tucson, AZ

Print_ISBN

0-7803-0562-0

Type

conf

DOI

10.1109/ULTSYM.1992.275899

Filename

275899