NICKEL-TITANIUM-BASE ALLOY SPECTACLE MEMBER AND ITS PRODUCTION

摘要

PURPOSE: To develop a material compsn. and a producing method capable of obtaining good superplasticity even in cold working at <=20% working degree and to enable the corresponding thereof to the production of spectacles members of all shapes and designs. CONSTITUTION: An Ni-Ti alloy obtd. by blending 1.0 to 2.5 atomic% Co into an Ni-Ti alloy in which the ratio of Ni to Ti (Ni/Ti) by atomic% is regulated to 0.97 to 1.04 is subjected to solution heat treatment at 600 to 900 deg.C for 10 to 120min, is rapidly cooled, is applied with plastic deformation at 5 to 20% working ratio and is molded into a final shape, which is next subjected to heat treatment at 325 to 450 deg.C for 10 to 120min to dispersedly precipitate Ni.Ti aging precipitates.