6061 vs 7075 aluminum testing?

Is there some simple test to distinguish 6061 vs 7075 aluminum alloy on
unmarked samples?
Reply to
Richard J Kinch
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If you already know that the samples are either/or, use a file, the crispy pieces are 75. If you don't know the alloy, you can only guess that you *may* have 7075. You could also have another 7000 series alloy, among others. Another way, knowing the either/or, is to put a bit of water between 2 pieces and leave them for a few hours. The 7075 will start turning black.
michael
Reply to
michael
6061 a lot softer, and weaker than 7075 in the common HT forms. I never tried it but maybe if you sandwich a small hardened ball between the two and compress them in vise, you can compare impression depths.
Richard J K> Is there some simple test to distinguish 6061 vs 7075 aluminum alloy on
Reply to
tomcas
Call your local scrap yard---They test the swarf to be sure there is no 7075 mixed in with 6061.......Zinc is intentionally alloyed into 7075 but is a contaminate in 6061.
I think they use sulphuric acid, put a sample in a clear bottle and shake........ then they hold it up to the light and look at it---I dont know what it is they are looking for though
Reply to
PrecisionMachinist

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