Microstructure and Interfacial Properties of ZCuSn10Pb10/Q235 Bimetallic Composite after Semi-Solid and Cladding Treatment.

The ZCuSn10Pb10 alloy cladding was connected to the Q235 steel substrate by melting-casting. The semi-solid treatment of ZCuSn10Pb10 alloy was carried out by strain induced melt activation (SIMA) method, which included two stages of extrusion and partial remelting. Then the as-extruded ZCuSn10Pb10 alloy was joined with the Q235 steel substrate containing the cladding layer in the partial remelting stage. The microstructure, interfacial diffusion behavior and interfacial properties of the bimetallic composite were studied. The results showed that the diffusion behavior of elements at the copper/steel interface after semi-solid and cladding treatment was mainly reflected in the increase of the thickness of the diffusion layer of Sn and Cu elements. The average shear strength of the samples treated with semi-solid and cladding layer could reach 193.0 MPa, and the fracture occurred between the copper layer and the cladding layer. For semi-solid treated composite, the energy stored during pre-deformation and semi-solid slurry formed during remelting are important factors for forming a good interface. [ABSTRACT FROM AUTHOR]