Determination of crystallographic orientation of large grain metals with surface acoustic waves

Li, Wenqi; Sharples, Steve D.; Smith, Richard J.; Clark, Matt; Somekh, Michael G.

Abstract

A previously described laser ultrasonic technique known as spatially resolved acoustic spectroscopy (SRAS) can be used to image surface microstructure, using the local surface acoustic wave (SAW) velocity as a contrast mechanism. It is shown here that measuring the SAW velocity in multiple directions can be used to determine the crystallographic orientation of grains. The orientations are determined by fitting experimentally measured velocities to theoretical velocities. Using this technique the orientations of 12 nickel and 3 aluminum single crystal samples have been measured, and these are compared with x-ray Laue backreflection (LBR) measurements with good agreement. The root mean square difference between SRAS and LBR measurements in terms of an R-value is less than 4.1°. The influence of systematic errors in the SAW velocity determination due to instrument miscalibration, which affects the accurate determination of the planes, is discussed. SRAS has great potential for complementary measurements or even for replacing established orientation determination and imaging techniques. © 2012 Acoustical Society of America.

Citation

Li, W., Sharples, S. D., Smith, R. J., Clark, M., & Somekh, M. G. (2012). Determination of crystallographic orientation of large grain metals with surface acoustic waves. Journal of the Acoustical Society of America, 132(2), 738-745. https://doi.org/10.1121/1.4731226

• Journal Article Type: Article
• Acceptance Date: Jun 11, 2012
• Online Publication Date: Aug 8, 2012
• Publication Date: 2012-08
• Deposit Date: Feb 1, 2022
• Journal: Journal of the Acoustical Society of America
• Print ISSN: 0001-4966
• Electronic ISSN: 1520-8524
• Publisher: Acoustical Society of America
• Peer Reviewed: Peer Reviewed
• Volume: 132
• Issue: 2
• Pages: 738-745
• DOI: https://doi.org/10.1121/1.4731226
• Public URL: https://nottingham-repository.worktribe.com/output/3156906
• Publisher URL: https://asa.scitation.org/doi/10.1121/1.4731226