High-strength and high-damping aluminum-zinc bimetal alloy and preparation method thereof

A Al—Zn alloy prepared using Al alloy and Zn alloy, or prepared using Al alloy and Zn pure metal;

• wherein
• the Al alloy is selected from Al—Zn—Mg alloy, Al—Mg—Si alloy, Al—Cu—Mg alloy or Al—Li—Cu alloy;
• the Zn alloy is selected from Zn—Al alloy;
• and the Zn—Al alloy is selected from Zn-20Al, Zn-27Al, Zn-40Al or Zn-50Al;
• a preparation method of the Al—Zn alloy comprises following steps:
• taking Al alloy foam metal material as a substrate, infiltrating Zn alloy melt or Zn pure metal melt into the substrate by impregnation to obtain a billet, and densifying the billet by hot-rolling or extruding to obtain the Al—Zn alloy;
• the Al alloy foam metal material has a pore size of 0.1-2 mm and is prepared by metal 3D printing or metal foaming method;
• and
• in the densifying by hot-rolling, an initial rolling reduction is 5-10%, an intermediate rolling reduction is 40-50%, a final rolling reduction is 10-20%, and a total rolling reduction is 55-80%;
• an initial rolling temperature is 400-500° C., an intermediate rolling temperature is 300-400° C., and a final rolling temperature is 200-300° C.