Strengthening and toughening forming of Al/Al₂O₃ composite in pseudo-semi-solid state

Yuansheng CHENG and Shoujing LUO School of Materials Science & Engineering,Harbin Institute of Technology,Harbin 150001,China

摘 要：A new technology thixo-die-forging of the composite in pseudo-semi-solid state was proposed based on the powder metallurgy technology combing with semi-solid metal process,and the cup shells with Al/Al2O3 composite was prepared successfully.The metallographic analysis and performance test show that the microstructure of parts is dense and mechanical properties are excellent with the volume fraction of Al is 37%.The bend strength and fracture toughness of the composite are about 570-690 MPa and 8.5-16.8 MPa·m1/2,respectively.Comparing with reaction in situ and high temperature oxidation technologies the bending strength and fracture toughness are improved greatly.At the same time,it shows that the technology parameters have great influences on the properties.So it is feasible to prepare metal/ceramics composites by the proposed technology.

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