LOL, an "alloy" by definition is a composition of mixed materials. Whether a pure material or an alloy, things like hardness are insufficient to identify materials. This is because the hardness, yield strength, and many other properties are a function of more than composition. Cold working, annealing, heat treating, etc., all affect properties like hardness.
I don't have a sure fire method for identifying your material, but can guarantee that there are many ways that don't work.
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