Application of simple practical models for early stage ageing precipitation kinetics and hardening in aluminium alloys

This paper demonstrates the application of the Johnson–Mehl–Avrami (JMA) theory for phase transformations combined with precipitation hardening theory to the early stage ageing precipitation and hardening kinetics in several aluminium alloys. It is found that the complex sequences of metastable phase formation during ageing do not affect the overall hardening kinetics. The applicability and limitations of the current modelling approach are discussed.