English: At first the sample is given shape in high temperature, when it is Austenite.
Then the sample is cooled, and Austenite converts to Twinned Martensite, keeping the shape.
Then the sample is cooled even further, and bent beyond the elasticity limit.
Now it has both the "hot shape" and "cold shape". If we heat it or cool it, the sample will try to go to one of them
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