Metallurgical Engineering > GATE 2026 > Precipitation Hardening

Which one of the following options is correct?
In Al - 4 wt.% Cu alloy during isothermal aging, the correct precipitation sequence is:

A

θ'' → θ' → θ → GP zone

B

GP zone → θ → θ' → θ''

C

θ → θ' → θ'' → GP zone

D

GP zone → θ'' → θ' → θ

Correct : d

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