含钪Al-Cu-Li合金的形变时效研究

Study of Deformation-Aging of Al-Cu-Li Alloy Containing Sc

通过显微组织观察和室温拉伸试验 ,研究了形变时效对含钪Al Cu Li合金组织和拉伸性能的影响。结果表明 ,时效前的预变形能促进T1(Al2 CuLi)相弥散细小的析出 ,显著提高合金的强度 ,使时效峰值提前。合金的强度随预变形量的增大而升高 ,但预变形量过大 ,不利于T1相的析出形态和分布 ,影响合金的性能。在本试验条件下 ,该合金的最佳预变形量为 3 5 %

Effects of deformation-aging on the microstructures and mechanical properties of Al-Cu -Li alloy containing Sc were studied by observation of microstructures and tensile test at room temperature.The results show that pretension before aging can greatly improve tensile properties of the alloy,And can make aging peak occur early and T1(Al_2CuLi) precipitation distribute more dispersively and homegenously.The strength of the alloy improves with the increasing of pretension,but over pretension leads to coarsening T1 phase and its distribution,which causes the strength of the alloy decreasing.The favorable pretension is about 3.5% under the experiment conditions.