Hi Victor - I recommend going to the Leco Corporation website and contact 
them about getting a copy of their "Metallography Principles and 
Procedures" booklet, form 200-860. Their booklet is considered by many 
folks to be the "bible" for metallography. The booklet contains multiple 
etchant recommendations for all elements and metal alloy families.  You 
could try Tucker's etch: HCl (conc) 45ml, HNO3 (conc) 15 ml, HF (48%) 
15ml, H2O 25 ml.

Dave Hillman 
Rockwell Collins
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Victor Hernandez <[log in to unmask]> 
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12/12/2008 12:49 PM
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Subject
[TN] Cold Forged Alunium (CFA), Cross section-grain structure






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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