The precipitation process of secondary phase can be accelerated by cold working before aging treatment, and the pinning effect of the precipitates on the dislocations gre.

• 时效前冷变形能大大加快析出相的析出,析出相对位错的钉扎作用强烈阻碍合金再结晶的形核和长大,使合金产生明显的时效硬化。