I have developed High Entropy Alloy Coatings by ball milling of Elemental Powders i.e. AlNiCoCrFe and using Atmospheric Plasma Spraying technique. Want to know about Annealing parameters and other post coating heat treatments.
The annealing temperature depends upon the thermal and mechanical history of your alloy/metal. Plasma spraying induces high residual stresses (is it what you means by high entropy?) then a lot of energy is stored into your alloy, thus I believe that the annealing temperature can be low. Many properties (hardness, conductivity, grain size, etc...) vary during heat treatment, by studying two of them you can determine the 3 temperatures corresponding to the 3 steps (annealing, crystallization & grain growth) that generally occurs during heat treatment. You can use DSC to. Hope I have given you a guideline.
Hello, I'm currently working on the mechanically alloyed powders of High Entropy Alloy. Firstly, I advise you to characterize well the milled powder i.e. phase composition, temperatures of phase transformations, etc. Powder after milling can contain contaminations (e.g. carbon, oxygen) that may affect on phase transformations. I agree with Frédéric Durut that DSC is an essential tool to determine the temperature of heat treatment. Good luck!
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