Dear Omid,

Thanks for your answer. Based on your answer, I further refined my question. For metrology application, we target a stability level at (sub)nanometer level over several months. Do you have any experience here or do you know any related references?

Thanks, Hans 

 There are several nano-indentation based creep techniques, which can give you the small scale creep information.

Refer :  "Choi, In-Chul, et al. "Indentation creep revisited." Journal of Materials Research 27.1 (2012): 3."

My collaborator, Dr.Jayant Jain works a lot on the area. 

Dear Hans J.P.M.B. Vermeulen,

As a non-expert I was puzzled by your question that directly arose a re-question 'why an aluminum alloy'. Given the rather low melting temperatures of Al alloys they seem to me rather susceptible for creep. Or, do you target at creep at cryogenic temperatures?

Dear Hariharan,

Thanks a lot for you answer. Would you be able to send me the paper you refered to by Choi, In-Chul, et al.: "Indentation creep revisited." in Journal of Materials Research 27.1 (2012): 3."