I want to do some AFM experiments and I wonder whether roughness changes by ECAP pass number or not? and how the specimen should be prepared, Is it necessary to mirror polish them or till 2000 grit is enough?
Depends on needs. If you want to find scratches 2000 - 2500 is ok. If You want to see structure better try electro-polisher. The best method for AFM sample preparation (metal sample) is the same as You using for TEM investigations.
Please check link, may be helpful for you.
https://www.youtube.com/watch?v=nrmNDm--Nqg
You may also check fol link;
https://www.researchgate.net/post/What_is_the_sample_preparation_process_before_AFM_measurement
Main old post: https://www.researchgate.net/post/Can_you_suggest_a_good_monograph_explaining_how_samples_should_be_prepared_for_AFM_studies2
according to many different kinds of samples.
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