The initial part of this video from The Engineering Guy isn't anything new to most of us teaching material science: NiTiNOL changes shape as its temperature is raised. From there, though, this video does a great job showing animations and graphics explaining what's happening within NiTiNOL when its temperature changes.
I haven't heard the explanation of the mirrored or non-mirrored rhombic crystals. That's really interesting, and I'd admittedly like to get some confirmation from an expert that it's not an over simplification.
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