Effect of composite addition of trace amounts of Mn,Zn and Ti on the microstructure and mechanical properties of Al-Cu-Li-Mg-Ag-Zr alloy was studied by using tensile testing machine,metallographic microscope,scanning electron microscope and transmission electron microscope.The results show that the composite addition of trace amounts of Mn,Zn and Ti elements can significantly refine the grain structure of the as-cast alloy,and at the same time,the insoluble second phase Al(CuMnFe)in the solution treated alloy is also refined.The composite addition of trace amounts of Mn,Zn and Ti elements can effectively promote the precipitation of the main strengthening phase T1 in the T6 and T8 peak aged Al-Cu-Li-Mg-Ag-Zr alloy,improving the mechanical properties of the alloy.Compared with the T6 peak aged,the amount of T1 phase precipitated in the T8 peak aged Al-Cu-Li-Mg-Ag-Zr alloy significantly increases,the size significantly decreases,the distribution is more uniform and dispersed,and the strength and plasticity are significantly improved.
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