Fellow TechNetters;

   Is there anyone out there with experience with CFA cross section and
chemical etchants to delineate grain boundary?   Do not have the
specific CFA alloy.
I used the following chemical etchant:
No. 5 Keller's etch        HF (conc)        1.0ml
			HCL  (conc)      1.5ml
			HNO3  (conc)    2.5ml
			H20                95.0ml	


Immerse for 10-20 sec; wash in stream of warm water,   Microstructure of
duraluminum type alloy.  17ST, AND ALCLAD

Not able to se grain boundary.

vic,

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