冷轧变形量对2A14铝合金高筒件时效析出行为及力学性能的影响

Effect of Cold Rolling Deformation on Aging Precipitation Behavior and Mechanical Properties of 2A14 Aluminum Alloy High Cylinder Ring

为探明冷轧工艺对2A14铝合金高筒件组织及性能的影响规律,本工作开展了铝合金变形样件冷轧变形工艺实验。通过拉伸测试、OM、SEM、DSC、TEM等研究了冷轧变形量对2A14铝合金高筒件时效析出行为及力学性能的影响。结果表明:冷轧变形后合金位错密度增大,有利于θ′相的形核、析出及长大,θ′相的析出使得铜原子浓度降低,抑制了Q′相的析出。当冷轧变形量为4%时,基体中同时析出了大量细小、弥散的θ′相和Q′相,材料综合性能最优,抗拉强度、屈服强度、延伸率分别为490.3MPa、428MPa、13.76%。

In order to find out the influence of cold rolling process on the microstructure and properties of 2A14 aluminum alloy high cylinder ring,this paper carried out the cold rolling deformation process experiment of aluminum alloy deformation samples. The effects of cold rolling deformation on aging precipitation behavior and mechanical properties of 2A14 aluminum alloy high cylinder ring were studied by stretching,OM,SEM,DSC and TEM. The results showed that the dislocation density of the alloy increases after cold rolling deformation,which was beneficial to the nucleation,precipitation and growth of the θ′ phase. The precipitation of θ′ phase reduced the concentration of copper atoms and inhibits the precipitation of Q′ phase. When the cold rolling reduction was 4%,a large number of fine-dispersed θ′ phase and Q′ phases were precipitated in the matrix,and the material had the best comprehensive performance. The tensile strength,yield strength and elongation were 490.3 MPa,428 MPa and 13.76% respectively.