Paper number 1366

INTERFACIAL STRUCTURE AND MECHANICAL PROPERTIES OF MGLIAL/SICW COMPOSITES

Zhang Di, Ma Chunjiang , Qin Jining , Zhang Xiaonong , H.Mori¹ and T.Sakata¹

State Key Lab of MMCs, Shanghai Jiao Tong University, Shanghai 200030, China
1Research Center for Ultra-High Voltage Electron Microscopy, Osaka University
Yamadaoka, Suita, Osaka 565-0871, Japan

Summary

Study on interfacial structure and tensile properties of MgLiAl/SiCw composites were carried out. The results showed that there is a clear interface between the Mg-Li-Al matrix and SiC whiskers and there are not any compounds formation on the interface. Calculation of thermodynamics confirmed that the clear interface between the matrix and SiC whiskers may contribute to the low reactionary potential or the low reactionary dynamics. However, some SiC whiskers were attacked. As a result, SiC whiskers connect with matrix in {111} and formed 70.5° or 109.5° stages on the surface of the whiskers. The reason for that is the lower interfacial energy of {111}. Tensile test confirmed that the MgLiAl/SiCw composites showed higher tensile strength and higher modulus compared with Mg-Li-Al matrix. Moreover, the specific strength and specific modulus were also increased obviously.

Keywords

Mg Li Al/SiC w composites, interfacial structure, mechanical property.