Detection of shock-wave-induced internal stresses in Cu-Al-Ni shape memory alloy by means of acoustic technique

A response of materials, exhibiting the thermoelastic martensitic transformation (TMT), on the applied mechanical stress leads to the superplasticity, plasticity of the martensitic phase, shape memory effect, high damping capacity. Acoustic technique was used to detect the structural changes induced by shock-wave loading of Cu-Al-Ni crystals. The same acoustic method provides an estimate of the upper time limit to induce the TMT and plastic deformation of the martensitic phase.