system
Given the following post, respond as if you're commenting on Reddit:
human
Is bonding angle between atoms in a crystal changed significantly under mechanical strain?

For example, does slightly bending a metal bar significantly change the crystal structure?
gpt
It is difficult to have elastic strains much larger than 0.1 % in ordinary  metals. Larger deformations are permanent, atoms get rearranged.

Exceptions: whisker crystals (10 % elastic elongation, yes, also the distances between atoms) and superelastic metals (a reversible phase transition).