what happens as a metal breaks? does the crystals of the crystal lines break? explain and make a sketch

Answer 1

Good question. There are many failure mechanisms, and they very with the metal and its corrosion, work hardening and fatigue history. See

http://www.jiskha.com/display.cgi?id=1268386837

for some descriptions and pictures.

A subject called dislocation theory is an important part of the story.
http://www.bondhus.com/metallurgy/body-4.htm