Study on Microstructure and Tensile Properties of 7A85 Alloy after Heat Treatment
7A85 alloy is a self-developed Al-Zn-Mg-Cu alloy,which is widely used in aerospace field.The microstructure and tensile properties of 7A85 alloy after heat treatment were studied,which was of great significance to accelerate and broaden the industrial application of 7A85 alloy.The results show that the grain of 7A85 alloy after heat treatment is long and there are many sub grains.After heat treatment,7A85 alloy is reinforced by GP zone and η'phase.The second phase of micron scale is mainly formed by the segregation of Al,Zn,Mg and Cu at the grain boundary,while Zr does not segregate at the grain boundary to form the second phase.The second phase of nanometer scale at the grain boundary is mainly formed by the segregation of Mg and Zn,and contains Cu in some second phases.After heat treatment,the tensile strength,yield strength and elongation of 7A85 alloy are 596 MPa,572 MPa and 10.6%,respectively.
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