초록 ▼

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, re

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 an article produced from this method.

대표청구항 ▼

A method of processing a nickel/titanium-based shape memory alloy having a transformation hysteresis defined by Ms, Mf, As, and Af temperatures, the method consisting essentially of: overdeforming the alloy, isothermally, at a temperature that is less than about the maximum temperature at which mart

A method of processing a nickel/titanium-based shape memory alloy having a transformation hysteresis defined by Ms, Mf, As, and Af temperatures, the method consisting essentially of: overdeforming the alloy, isothermally, at a temperature that is less than about the maximum temperature at which martensite can be stress-induced, by applying a continously increasing stress sufficient to cause nonrecoverable strain in the alloy so as to temporarily expand the transformation hysteresis by elevating the As and Af temperatures to As′and Af′, respectively, so that the temperature difference between As′and Ms is greater than the temperature difference between As and Ms; and storing the alloy at a temperature between As and As′.