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Can't etch/examine recast layer in Ti48Al2Cr

hi
I'm investigating on recast layer in wire-edm of TiAl . I've machined a 1cm*1cm block and polished the section but I don't see any white layer by optical metallurgical microscope . I etched section with nital 2% but I don't see anything . can anybody help me ? is there any problem with etching or anything ?

Mohsen Tavangar
research engineer in aerospace industry - Isfahan, Iran
September 6, 2008

September 12, 2008

additional information:
I etched block with HF+HNO3+Water (titanium alloys etchant).
I can see every thing but there is no recast layer (I think) under optical microscope .please help.

Mohsen Tavangar
- Iran

Hi Mohsen,

You need to post your enquiry on a metallography website.

The undoubted skills and experience of regular contributors to this site do not really include expertise in optical microscopy for examination of microstructures.

Bill Reynolds [deceased]
consultant metallurgist - Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.
September 12, 2008

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