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Thank you all very much for the answers. Titanium is a choice I'm seriously considering. This all gives me a lot to digest.

Thanks for the answers! EdStainless, not quite the FEA tells about 385 MPa max stress, while the yield strength is about 550 MPa. My worry is that the 125 degrees Celsius ages the aluminum fast to decrease yield strength, but there is not much information on that. TugBoatEng, yes that's what I...

The impeller is machined from a block

Hello, I am designing a centrifugal heat pump, which compresses air. I'm considering making the impeller from aluminum, probably from 7075, since the stresses rise to about 385 MPa when rotating at high speeds. The input temperature of the air is 85 degrees Celcius and output 125 degrees...