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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