Patent ID: 7253219
Filing Date: 2007-08-07
Classification: B29C,C22F

Abstract:
1. A process for producing a functional, martensite reverse-transformed composite material, the process comprising: a) cold drawing a shape memory Ti—Ni based alloy, transformable between a martensite phase and an austenite phase at phase transformation temperatures, for plastic deformation to produce cold-drawn shape memory alloy wires having a martensite reverse transformation starting temperature of at least 130° C.; b) then molding said cold-drawn shape memory alloy wires in a martensite phase surrounded by a resin matrix to form a composite material; c) then curing said resin matrix; and d) then passing electric current through said cold-drawn shape memory alloy wires, embedded within said cured resin matrix, to heat said wires to a temperature above the reverse transformation temperature and to cause martensite reverse transformation to occur so that the reverse transformation temperature is normalized.