强变形工艺对2519A铝合金组织与性能的影响

通过硬度测试、拉伸性能测试、透射电镜观察等分析手段研究了不同强变形工艺下2519A铝合金的力学性能与微观组织。结果表明,经50%的冷轧变形和165 ℃人工时效后,2519A合金的力学性能明显提高,其抗拉强度、屈服强度和伸长率分别为522 MPa、468 MPa和8.5%。而在冷变形前添加165 ℃×2 h预时效处理,合金的力学性能进一步提高,其抗拉强度、屈服强度和伸长率分别达到535 MPa、497 MPa和8%。预时效处理可以提高合金中θ′相的密度,使析出相分布更加均匀,有助于提高合金的力学性能。

Effect of severe plastic deformation on microstructure and mechanical properties of 2519A aluminum alloy

Microstructures and mechanical properties of 2519A aluminum alloy after different severe plastic deformation processes were investigated by means of hardness test, tensile test, and transmission electron microscopy (TEM). The results show that after 50% cold rolling reduction and artificial aging at 165 ℃, the tensile strength, yield strength and elongation of the 2519A alloy are 522 MPa, 468 MPa, 8.5%, respectively. And adding 165 ℃×2 h pre-aging before cold rolling, the mechanical properties are further improved, and the tensile strength, yield strength and elongation of the alloy are 535 MPa, 497 MPa, 8%, respectively. Pre-aging treatment can increase the density of θ′ precipitates in the 2519A alloy and make them more uniformly distributed, which is helpful to improve the mechanical properties of the alloy.