Microstructures
by George Langford, Sc.D., Massachusetts Institute of Technology, Cambridge, MA, 1966
Copyright©
2005 by George Langford
Unknowns , Non-Ferrous - Set 2 - First specimen - M.I.T.'s #445
Unknown No. 445 at 500X etched
This is an aluminum - copper alloy ...

I made both photomicrographs at 500X.

Hint: There is some faint alignment/elongation of the grains diagonally from top to bottom, nearly straight up and down ...
Unknown No. 445 at 500X etched
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