I reduced the Al content in a high-entropy alloy coating and found that its crystallinity was significantly improved compared to before the reduction, and I would like to know why.
In addition, why is the sputtering rate of crystalline coatings lower than amorphous coatings in coatings of the same composition?
There are many possible explainations since you are dealing with high-entropy alloy which contains many elements and probably complex phases system. But, when discussing about crystallinity, thermal dynamic is always a good starting point, especially cooling rate. we all know that high cooling rate resulting low crystallinity and vice versa. Reducing Al composition maybe can decrease the cooling rate of your material system, which resulting higher crystallinity.
Well, to increase the crystallinity it is important to perform a thermal treatment at a suitable temperature so that the resistance of the material will decrease but the size of the crystallite will increase.
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