Strengthening and toughening forming of Al/Al_2O_3 composite in pseudo-semi-solid state  

作　　者：Yuansheng CHENG Shoujing LUO 

机构地区：[1]School of Materials Science & Engineering, Harbin Institute of Technology, Harbin 150001, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2010年第1期21-26,共6页金属学报（英文版）

基　　金：supported by National Natural Science Foundation of China(No50705018);Postdoctoral Foundation of China (No20070420847)

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 axe 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·m^1/2, 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.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 axe 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·m^1/2, 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.

关 键 词：Thixo-die-forging Pseudo-semi-solid state Al/Al2O3 Metal/ceramics composites 

分 类 号：TB333[一般工业技术—材料科学与工程] TG316.3[金属学及工艺—金属压力加工]