Hi everyone,
I am looking for an etchant which is suitable for Mg +TiB2 based composite. Mg and Mg-alloys have clearly many etchant and well defined. Does it apply the same for composites. I would be grateful for the more information.
If you use casting process to make the Mg composite, you can use 10 g citric acid in 100 ml water.
You may want to consider: 1 cm3 conc. HNO3 + 24 cm3 H2O + 75 cm3 ethylene glycol (~4 s); a general-purpose etchant for Mg and Mg-based alloys that seems also suitable for Mg/TiB2 composites. For specific TiB2 etchants, you may refer to: Günter Petzow, "Metallographic Etching ─ Techniques for Metallography, Ceramography, Plastography", 2nd ed., ASM International, 1999, p. 169.
10 % Nital will do, but I found out during polishing, water do etch Mg Alloy naturally. Avoid using 600 micron SiC paper and 6 micron polishing cloth. I used 800, 1200 micron SiC follow by 1 micron autopolisher for abut 3 to 4 min and the sample is etched.
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