Method of preparing a two-way shape memory alloy

Details Method of preparing a two-way shape memory alloy Method of preparing a two-way shape memory alloy

1981-10-02

1984-03-06

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 115N, 148402, C22F 100, C22F 110

Patent

active

044352298

ABSTRACT:
A two-way shape memory alloy, a method of training a shape memory alloy, and a heat engine employing the two-way shape memory alloy to do external work during both heating and cooling phases. The alloy is heated under a first training stress to a temperature which is above the upper operating temperature of the alloy, then cooled to a cold temperature below the zero-force transition temperature of the alloy, then deformed while applying a second training stress which is greater in magnitude than the stress at which the alloy is to be operated, then heated back to the hot temperature, changing from the second training stress back to the first training stress.

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patent: 3953253 (1976-04-01), Clark
patent: 4010455 (1977-03-01), Stange
patent: 4304613 (1981-12-01), Wang et al.

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