The study on interfacial structure and tensile properties of MgLi matrix composites. The results showed that there was a clear interface between the MgLi matrix and SiC whiskers. Calculation of thermodynamics con rmed 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 connected with matrix in {111} and formed 70.5 ± or 109.5 ± stages on the whiskers surface in {111} face. The reason was the lower interfacial energy of {111} face. Tensile test con rmed that the SiC w / MgLiAl composites showed higher tensile strength and higher modulus compared with MgLi matrix. Moreover, the speci c strength and speci c modulus were also increased obviously.

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