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Secondary phase, heat treatment

by mattyboson12
Tags: heat, phase, secondary, treatment
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mattyboson12
#1
May24-14, 09:43 AM
P: 6
"Precipitation hardening is a heat treatment that distributes secondary phases more evenly in an alloy..." What does it mean by a secondary phase?
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Astronuc
#2
May24-14, 12:19 PM
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Quote Quote by mattyboson12 View Post
"Precipitation hardening is a heat treatment that distributes secondary phases more evenly in an alloy..." What does it mean by a secondary phase?
A second phase or secondary phase has a different stoichiometry (composition) and microstructure than the primary phase of an alloy. Second phases are usually intermetallic compounds.

For example in nickel superalloys, Al and Ti form nickel aluminides or titanides.

http://en.wikipedia.org/wiki/Nickel_aluminide

http://en.wikipedia.org/wiki/Superalloy
mattyboson12
#3
May24-14, 12:30 PM
P: 6
Thank you


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