Interfacial structure and mechanical properties of MgLi matrix composites

Abstract

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.

Recent progress in magnesium–lithium alloys

“…SiC w connects with the matrix in (111) and forms 70?5u or 109?5u stages on the whisker surface in (111). 83 B, B 2 O 3 and B 4 C reinforced Mg-Li composite…”

“…SiC w connects with the matrix in (111) and forms 70·5° or 109·5° stages on the whisker surface in (111). 83…”

Microstructure, properties and application of YAl2 intermetallic compound as particle reinforcements

“…Although there is no interface reaction in SiC w /MgLiAl composites [33], the plasticity of the composites is undesirable due to lower load-bearing ability of SiC compared to …”