• Juan, J. San
• Breczewski, T.
• Graczykowski, Bartłomiej
• Mróz, Bogusław
• Nó, M. L.
• Mielcarek, Sławomir

Abstract

<p>A single crystal Cu14%Al4%Ni shape memory alloy in austenitic phase was studied by Brillouin spectroscopy to analyse angular dispersion of Rayleigh surface waves in the planes (0 0 1) and (1 1 0). Measurements were made at room temperature using a tandem-type Fabry-Perot interferometer (JRS Scientific Instruments). Experimental results permitted determination of three independent elastic constants and anisotropic Young's modulus. In the (1 1 0) plane the pseudo-surface waves were found to occur, which - in the context of the past literature data - is unusual for cubic crystals of anisotropy coefficient higher than one. The elastic tensor components determined were used for simulation of surface phonons by the finite element method. The surface phonon velocities obtained were compared with the experimental results and the results of calculations based on the available analytical expressions for the phonon velocities for high-symmetry directions. Particular attention was paid to the relation between the elastic constants (anisotropy coefficient) and the depth of surface phonon penetration. © 2011 IOP Publishing Ltd.</p>

Topics

• impedance spectroscopy
• dispersion
• surface
• single crystal
• phase
• simulation
• anisotropic
• light scattering