Internal friction of TiNi alloys produced by a lamination process

• Published in: Journal of alloys and compounds Vol. 333; no. 1; pp. 159 - 164
• Main Authors: Hishitani, K, Sasaki, M, Imai, D, Kogo, Y, Urahashi, N, Igata, N
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 14.02.2002; Elsevier
• Subjects: Anelasticity, internal friction, stress relaxation, and mechanical resonances; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; High damping; Internal friction; Lamination; Martensitic transformation; Martensitic transformations; Materials science; Mechanical and acoustical properties of condensed matter; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; TiNi; High damping; Martensitic transformation; Internal friction; Lamination; TiNi; Damping; Annealing; Inorganic compounds; Nickel alloys; Mechanical strength; Water quenching; Cooling rate; High strength alloy; Martensitic transformations; Tensile strength; Cold rolling; Binary alloys; Titanium alloys; Diffusion; Transition element alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(01)01718-2

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 make 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 δ=0.14 at 250 K and ultimate tensile strength about 800 MPa was obtained.