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(Source: http://en.wikipedia.org/wiki/Shape_memory ; Aug. 25, 2012)
Two Way Memory Effect
The two-way shape memory effect is the effect that the material remembers two different shapes: one at low temperatures, and one at the high temperature shape. A material that shows a shape memory effect during both heating and cooling is called two-way shape memory (plate 10). This can also be obtained without the application of an external force (intrinsic two-way effect).
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