Effect of Cold Rolling Deformation on Microstructure and Mechanical Properties of Solution-treated 2195 Al-Li Alloy

The extruded and solution-treated plates of 2195 Al-Li alloy were cold rolled by the reduction of 5% ~ 25% followed by an artificially aging process, and then the effect of cold rolling deformation on its microstructure and mechanical properties were studied through microstructure analysis and tensile test. The results show that the 45° shear bands begin to appear among some fibrous structures in the thickness direction of the plate after the reduction reaches 20% . Furthermore, the bands can be distributed in the whole thickness of the plate when the reduction increases to 25% . After aging treatment(155 ℃ for 28 h), the yield, tensile strength and final elongation of the cold-rolled plates firstly increase and then decrease with the reduction increase. When the reduction is 10%, the yield, tensile strength and final elongation of the plate reach their maximum values of 575 MPa, 604 MPa and 13. 7%, respectively. After aging, the yield-tensile strength ratio of the sample increases from 90. 8% to 97. 4% with the reduction from 0 to 20%, and then slightly decreases to 97. 1% with further increasing reduction to 25% . Therefore, for the extruded and solution-treated 2195 Al-Li alloy plate, the reduction of cold rolling should be controlled around 10% . © 2023 Northeastern University. All rights reserved.