Suitable Etchant for high entropy alloy FeCoNiCrMo?

24 February 2025 0 1K Report

I have tried using Keller's solution to etch my samples to no avail. From there I tried electro etching at 2.5 v, 5v , 7v and 10v in a 10% oxalic acid and distilled water mixture at room temperature but I have seen no visible change of the surface under an optical microscope. Has anyone had any success with other methods. Any ideas would be much appreciated.

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