Thanks for sharing!   I downloaded the pdf file and ordered my free CD.

vic,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Friday, December 12, 2008 1:23 PM
To: [log in to unmask]
Subject: Re: [TN] Cold Forged Alunium (CFA), Cross section-grain
structure

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
[log in to unmask]



Victor Hernandez <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
12/12/2008 12:49 PM
Please respond to
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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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