Shape-Memory Wire Returns
Wire returns toward its trained shape.
Teaching & key ideas
What you do: Bend wire cool, then warm it.
What students see: Wire returns toward its trained shape.
Why it works: A reversible crystal-structure change makes the alloy remember a high-temperature form.
Question to ask: How can metal 'remember' a shape?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: How can metal 'remember' a shape?