A quantitative micro-deformation field study of shape memory alloys by high sensitivity moire

Quantitative micro-macro combined experimental research on the deformation field of single crystal CuAlNi shape memory alloy (SMA) is performed by using high sensitivity Moire technique. The study is focused on the micro-macro correspondence of the deformation behavior of single crystal uniaxial tensile specimen during stress induced forward and reverse transformations. The aim of the experiment is to quantitatively relate the macroscopic applied stress with the deformation field in the mesoscale. The large deformation due to the lattice distortion during transformation was first successfully recorded by Moire interferometry. Some important microstructure-related deformation features of single crystal SMA under uniaxial tension are first reported.