Can anyone give me any idea of a suitable etchant for FeMnNiCoCu high entropy alloy?

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Artashes Ter-Isahakyan

I have worked with that allow and had bit of trouble with etchants. Only one that consistently worked is a 3:2:1 HCl :H2O: HNO3 mixture. It may etch very quickly, If it is too strong add more water.

Regards

Shufeng Zhang

Entropy: A concept that is not a physical quantity

https://www.researchgate.net/publication/230554936_Entropy_A_concept_that_is_not_a_physical_quantity