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microstructure of NiTi based shape memory alloys

microstructure of NiTi based shape memory alloys

i would like to reveal the microstructure of NiTi shape memory alloy which is austenitic at room temperature.
What etching solution to use (chimical or elecrochemical)?
thank you

RE: microstructure of NiTi based shape memory alloys

Go pull literature from the alloy producer and see what they used.
As I recall it depends on what features you are trying to examine.

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P.E. Metallurgy, Plymouth Tube

RE: microstructure of NiTi based shape memory alloys

The etchant that is used requires mixing with hydrofluoric acid (HF), so it usually has to be mixed fresh to be effective. You can read about it in this paper:

If you don't have experience in working with dangerous chemicals or have the proper equipment and safety protocols to handle them, then I do not recommend using these particular types of etchants. HF is deadly. Do not let it come into contact with your skin. If it does it will be readily absorbed into your body. If this happens you will need to go to a treatment center immediately since it goes straight for your bones. Failing to seek medical attention could cost you your life in a matter of days.


RE: microstructure of NiTi based shape memory alloys

Thank you for your help and for the paper Maui. It is very interesting.

RE: microstructure of NiTi based shape memory alloys

The only two chemicals that I am scared of (now that Picric acid is gone) are HF and concentrated H2O2.

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P.E. Metallurgy, Plymouth Tube

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