Pseudo-elastic strain estimation of textured TiNi shape memory alloys

In this paper, the texture and pseudo-elastic strain anisotropy of TiNi sha pe memory alloys have been studied. Orientation distribution functions (ODF ) were first calculated using iterative series expansion method from incomp lete pole figures measured by X-ray texture goniometers. Crystallographic t extures and tensile pseudo-elastic strains at different angles were correla ted by the method of statistically averaging the strains in the tensile axi s contributed by every constituent grain according to the axis-symmetric st rains of free and constrained single crystals. The calculated and experimen tal strains were well compatible and reached the respective maximums in the same angular range. The discrepancy between theory and experiment is expla ined by the redistribution of slip system orientations caused by texturing. In terms of the texture analysis and pseudo-elastic strain prediction, we can efficiently control the textures of shape memory alloys and optimally u tilize the shape memory effects. (C) 1999 Published by Elsevier Science S.A . All rights reserved.