Effect of pre-stretching on the precipitation behavior and mechanical properties of X2A66 aluminum alloy

Abstract

The evolution of aging precipitation behavior and the formation of mechanical properties of X2A66 alloy under different aging heat treatment systems were investigated by using the experimental method combining mechanical properties test and microstructure observation. The research results indicate that the pre-stretching treatment before aging can accelerate the aging response rate of the alloy. In addition, while increasing the precipitation density of T1 phase, the diameter of T1 precipitate is decreased, but the thickness of T1 precipitate is not changed. With the increasing of pre-stretching, the strengthening effect of deformation dislocation increases gradually, and the strengthening effect of T1 phase precipitation decreases gradually. The pre-stretching of 5% can make the sample to obtain the best strong plastic ratio, and the yield strength, tensile strength and elongation rate are 593 MPa, 611 MPa and 10.7% respectively.

Keywords

• x2a66 alloy
• pre-stretching
• precipitation behavior
• mechanical properties
• reinforcement model