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No question, sricciardelli, & what many don't know, or will not believe, is that at that same time, an abrasion effect takes place to remove material from the harder material as well.
Had a bud (sadly, he is no longer with us) who did gaging aspects for the militry's 25mm bullet ..... an aluminum "nose-cone" continually run over a hardened/gage-quality steel-piece.
That gage gradually wore out due to the constant wearing of "mere" aluminum over its face. Needed to be replaced "quite often" & much more so often than anyone initially thought. An eye-opener.
Matter of fact - aluminum oxide is one of THE prime industrial abrasives available on the market. As soon as aluminum contacts the air (oxygen, to be presise), it forms its oxide as a protectorant - one of aluminum's fave property .... a way abrasive. Think about it.
If nothing else, go visit the Grand Canyon. Water wore away that depth. In time, anything will wear away anything else more "hard."
All it takes is time, with use.
Any object in contact with another, will deposit AND compile to wear.
May not matter one whit in our lifetime, but to say "it doesn't" is only a matter of perspective - & most likely wrong.
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