Microstructures
by George Langford, Sc.D., Massachusetts Institute of Technology, Cambridge, MA, 1966
Copyright©2005 by George Langford
Non Ferrous Alloys - Lesson 2 - First specimen - Part II
As cast tough pitch copper at 200X etched Whenever you see annealing twins in an FCC metal, you can be fairly sure that it's been annealed after cold work.  If the annealing twins are bent, then it's been deformed again after being recystallized (annealed).






The second specimen is a manganese bronze.