Abstract
To meet the stringent requirements of heat-resistance products for aerospace applications, an Al-4.0Cu-1.3Mg-0.6Si alloy containing a cubic σ phase (Al5Cu6Mg2) with excellent high temperature stability was developed. Influence of deformation on aging precipitation behavior of the alloy was investigated by transmission electron microscope (TEM) and differential scanning calorimetry (DSC). The results indicated that cold deformation had great effect on aging precipitation behavior in the alloy. When the alloy was processed a pre-stretching deformation before aging, the precipitation of σ phase was restrained while the S′ phase (Al2CuMg) was promoted. And the nucleation sites played an important role on them.
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