NI-TI-CU SHAPE-MEMORY ALLOY AND ITS MANUFACTURE

摘要

PURPOSE:To obtain a shape-memory alloy having excellent memory characteristics and fatigue characteristics by subjecting an Ni-Ti-Cu alloy having specific atomic ratio to cold working and thereafter to heat treatment in the range of specific temp. CONSTITUTION:The alloy consisting of, by atom, 3-10% Cu, 37-44% Ni and the balance constituted of Ti is subjected to hot working and cold working and is formed into a wire, etc. The alloy is then subjected to heating treatment by the conduction of electricity or the like at 350-475 deg.C. In the Ni-Ti-Cu shape- memory alloy subjected to the heating treatment, fatigue characteristics in a heating cycle of the conduction of electricity is improved. At the time of using the shape-memory alloy as a temp. sensor and an actuator, its service life can be improved.