Abstract
Gum Metal is a newly developed beta titanium alloy, which has an ultra-low elastic modulus, high strength, sup erelasti city, superplasticity, invar and elinvar properties. In this study, microstructural change including texture change by annealing have been investigated on cold-rolled sheets of Gum Metal, Ti-36.3Nb-2.03Ta-2.88Zr-0.31O. The results obtained were compared with those of a Ti-15V 3Cr-3Sn-3A1 alloy, typical beta titanium alloy. In the cold-rolled sheets , development of (111)<001> and (001)<110> textures were observed in Gum metal and Ti-15V 3Cr-3Sn-3-Al, respectively. There textures did not change basically by an annealing at 700℃ for 30min, although slightly weakened. Optical microstructures in the cold-rolled sheets did not change markedly by the annealing, either. Thus , the two alloys annealed at 700℃ for 30min were deduced to be in the recovered state.
