Anyone know what happens when you bend a single crystal wire?
My metallurgical training would suggest the single crystal would morph into multiple crystals, or grains. It is called work hardening. Grain boundaries increase resistance.
Unlike other crystals, metal crystals often have an extra half-sheet of atoms which allows the crystal to 'slip' and plastically deform way below the breaking point of brittle crystals. The purer the metal, the easier it slips and the softer it is.