| 摘要 |
PROBLEM TO BE SOLVED: To optimize the production and to reduce the cost by executing hot rolling, cold rolling and final heat treatment under prescribed conditions. SOLUTION: In this method, a raw material is subjected to hot rolling at 500 to 1000 deg.C at 30 to 98% working ratio, is thereafter subjected to cold rolling at 30 to 70% working ratio and is next held at 600 to 800 deg.C for 30min to 5hr. This treatment is for refining the crystal grains of Nb-Ti. Then, it is subjected to cold rolling at 30 to 98% working ratio and is subjected to heat treatment at 300 to 450 deg.C in which holding time per time is regulated to 1 to 168hr and cold rolling in which working ratio per time is regulated to 30 to 98% alternately for <=6 times to form into a sheet or foil shape. In this way, dislocations and pores to form the driving force of precipitation are introduced therein to precipitate a sufficient amt. ofα-Ti. Furthermore, it is subjected to final heat treatment at 300 to 450 deg.C for 1 to 1000hr. This is executed for moreover increasing the density of theα-Ti precipitated by the repetition of the cold working and heat treatment in the process.
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