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A new theory of two-phase zone continuous casting(TZCC) has been established in order to improve mechanical properties,corrosion resistance and conductivity properties of metals with wide solid-liquid two-phase zone.A Cu-Sn alloy with continuous columnar grains-covered non-columnar small grains of same phase microstructure containing many self-closed grain boundaries were produced by the self-developed TZCC process.Compared with water-cooled mold continuous casting Cu-Sn alloy,the tensile strength and ductility of the TZCC alloy are greatly improved,the corrosion resistance is improved up to fifteenfold,and the conductivity is improved by 12.2%.The excellent high strength may be due to the effective blockage of dislocation motion by numerous self-closed grain boundaries,which suppress the propagation of grain boundary corrosion,and the extremely low electrical resistivity and high ductility may be attributed to continuous columnar grains.
A new theory of two-phase zone continuous casting (TZCC) has been established in order to improve mechanical properties, corrosion resistance and conductivity properties of metals with wide solid-liquid two-phase zone. A Cu-Sn alloy with continuous columnar grains- covered non-columnar small grains of same phase microstructure containing many self-closed grain boundaries were produced by the self-developed TZCC process. Compared with water-cooled mold continuous casting Cu-Sn alloy, the tensile strength and ductility of the TZCC alloy are greatly improved, the corrosion resistance is improved up to fifteenfold, and the conductivity is improved by 12.2%. the excellent high strength may be due to the effective blockage of dislocation motion by numerous self-closed grain boundaries, which suppress the propagation of grain boundary corrosion, and the extremely low electrical resistivity and high ductility may be attributed to continuous columnar grains.