| 摘要 |
PURPOSE:To manufacture a shape memory alloy working at relatively high temp. and reduced in deterioration in characteristics due to heat cycle by subjecting a Ti-Ni-Cu shape memory alloy with a specific composition to hot working, annealing, and cold working to form this alloy into a wire, etc., and then applying low-heat treatment to the above. CONSTITUTION:An ingot of an Ni-Ti-Cu alloy having a composition consisting of, by atom, 49.5-50.5% Ti, 5.5-12.0% Cu, and the balance Ni is annealed, e.g., at 950 deg.C for about 5hr and then hot-worked into a wire of about 5mmphi. This wire is subjected to wire drawing, while being repeatedly annealed, and then to final annealing at about 900 deg.C and further to cold working at 10-40% draft so as to be worked into a wire of 0.6mmphi, which is coiled and then subjected to low-heat treatment at 350-600 deg.C. By this method, the shape memory alloy wire working at relatively high temp. and reduced in deterioration in characteristics due to heat cycle can be obtained. |
