摘要
Two kinds of bi-metal composite parts （Sn-15%Pb and Pb-22%Sn bi-metal system, and Al-7%Si and SiCp/6061 MMC bi-metal system） were prepared by the strain-induced melt activated thixo-forging. The interfaces of the bi-metal composites were observed by OM and SEM. The observations show that the semisolid metals keep independence during thixo-forging. The solid phases in the semisolid slurries maintain their original morphologies after thixo-forging. The liquid phases near the interface mix together and form a thin layer. The interfaces are bonded firmly with the metallurgical bonding. No oxide layers are found at the interfaces. Strengths of the interfaces were investigated by the micro-hardness test. The experimental results show that the composite interfaces have high strength. However, the agglomerated enhancing particles cause fine defect on the interface of the Al-7%Si and SiCr/6061 MMC bi-metal composite.
Two kinds of bi-metal composite parts (Sn-15%Pb and Pb-22%Sn bi-metal system, and Al-7%Si and SiCp/6061 MMC bi-metal system) were prepared by the strain-induced melt activated thixo-forging.The interfaces of the bi-metal composites were observed by OM and SEM.The observations show that the semisolid metals keep independence during thixo-forging.The solid phases in the semisolid slurries maintain their original morphologies after thixo-forging.The liquid phases near the interface mix together and form a thin layer.The interfaces are bonded firmly with the metallurgical bonding.No oxide layers are found at the interfaces.Strengths of the interfaces were investigated by the micro-hardness test.The experimental results show that the composite interfaces have high strength.However, the agglomerated enhancing particles cause fine defect on the interface of the Al-7%Si and SiCp/6061 MMC bi-metal composite.
基金
Project(1343-71333000469) supported by the Funding of Graduate Student Training of Central South University,China
