How to Demonstrate Temperature Properties of Muscle Wire (Nitinol)

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Introduction: How to Demonstrate Temperature Properties of Muscle Wire (Nitinol)

Sometimes called the Smart Alloy, Muscle Wire or Memory Metal, is an alloy that "remembers" it shape. You can reshape the wire, but when heated it returns to the preset shape. Ever wonder how someone bends a spoon with their mind? Same metal.

This demo straighten the spring so it is suined. Then attach a battery to it and it goes back to the spring shape.

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    14 Comments

    how is this an instructable?

    Is there any kind of muscle wire that works between room temperature and a cooler temperature?

    What happens if you bend it while it is still connected to the battery? Will it return to its shape?

    They sell it on unitednuclear, or you could try eBay

    In the 80's my family owned a beer distributorship.  My brother was the general manager and he had a wire that he would pull out of his pocket straight, then hold a lighter to it, then it would change to spell out "Coors"

    how can make it a shape that it will return to

    Can you bend it again after it comes to its own shape?

    4 replies

    yeah. it just does that over and over until it breaks.

    Oh ok.Niice.

    that's actually how anti-scald faucets work. they have a stretched spring inside them, and when the water gets too hot it pulls it closed.

    Oh ok

    i always love watching things blow up

    Once again, cool. Are you a science/ chemistry teacher or something? You're a genius.