Stress induced martensitic transformations in tension/torsion of CuAlNi single crystal tube

Abstract A CuAlNi single crystal tube was loaded in tension while keeping the torsional displacements free. The tube extended and simultaneously twisted during the stress induced martensitic transformation. A cooperative activity of four habit plane/shear direction transformation systems appearing at the same time in different quadrants of the tube wall is considered to rationalize the unusual mechanical behavior.