Method of processing a nickel/titanium-based shape memory...

Details Method of processing a nickel/titanium-based shape memory... Method of processing a nickel/titanium-based shape memory...

C - Chemistry, Metallurgy

22

C

64/20, 148/34.8

C22C 19/03 (2006.01) C22F 1/00 (2006.01) C22F 1/10 (2006.01) C22F 1/18 (2006.01)

Patent

CA 1269915

Abstract of the Disclosure There is disclosed a method of processing a nickel/ titanium-based shape memory alloy. The method comprises overdeforming the alloy so as to cause at least some amount of nonrecoverable strain, temporarily expanding the transformation hysteresis by raising the austenite transformation temperature, removing the applied stress and then storing the alloy at a temperature less than the new austenite transition temperature. There is also disclosed a method of preassembling a composite coupling which includes the steps of overdeforming a driver member, removing the stress, engaging the driver member and an insert and then warming the driver and insert to a temperature less than As'. Finally, there are disclosed couplings produced by these methods.

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