Effects of strain rates on dynamic deformation behavior of Cu-20Ag alloy

•Increase of strain rate reduced the adiabatic shear sensitivity of the Cu-20Ag alloy.•The Cu-Ag interface has obvious orientation relationship with 111Cu//(111)Ag; 1¯11Cu//(1¯11)Ag; 2¯00Cu//(2¯00)Ag and [01¯1]Cu//[01¯1]Ag with the increasing of strain rate.•The increase of strain rate promotes the precipitation of Ag and increases the strain of interfaces in the microstructure.