Internal friction of TiNi alloys produced by a lamination process

Recently, the demand for higher damping materials with higher strength has been requested from the precision machine industries. Of these materials, the TiNi alloy has excellent characteristics with high damping capacity and high strength. However, with respect to practical use, its cold rolling is difficult. In order to solve this problem, we examined the production of the TiNi alloy from the Ti-Ni laminated material by the solid-phase diffusion method. In this study, to investigate the best processing conditions to snake a high damping TiNi alloy with high strength, the effects of the material composition, annealing time and cooling rate of the water quenching on the internal friction and tensile strength were examined. As a result, a material with an internal friction of delta=0.14 at 250 K and ultimate tensile strength about 800 MPa was obtained. (C) 2002 Elsevier Science B.V. All rights reserved.