1420Al-Li/Mg-9Li/1420Al-Li composite plate with high-strength,corrosion-resistant and ultralight 1420 Al-Li alloy as the cladding plate was successfully prepared by one-pass hot rolling.The interfacial microstructure and mechanical properties of the composite plates by hot rolling at 450 ℃ with different reductions were investigated.The results show that when rolling pressure is 35％,the composite plate is only partially bonded-mechanical bonding+metallurgical bonding and no compounds are formed at the interface,the tensile strength of the composite plate is 236 MPa,elongation is 26％.As the rolling pressure is 50％,the composite plate can be formed by metallurgical bonding and unbounded compound.The tensile strength of the composite plate is as high as 272 MPa,and the elongation is 14％.While improving the corrosion resistance,the strength of the Mg-9Li alloy is greatly improved.
万方数据