Kinetics and Microstructural Control

· The dependence of yield strength on ageing for the 4 wt % Cu alloy is shown and indicates the second phase types responsible for the mechanical properties.
· The material initially softens as substitutional copper atoms aggregate.
· The material initially softens as substitutional copper atoms aggregate.
· Aggregate organization to form the G-P-zones followed by θ-precipitates increases the yield stress to a maximum.

From: Ashby & Jones,
"Engineering Materials 2," Pergamon (1986)