The Microstructures for Hot Compressive Deformation of MB15 Magnesium Alloy and Al18B4O33w/MB15 Magnesium Matrix Composites

Abstract

The hot compressive deformation behaviors of MB15 and Al18B4O33w/MB15 have been researched on with hot compression tests. The flow behaviors of the deformed materials have been analyzed. The microstructure observation tests were carried out by means of OM and TEM. The results of the study indicate that working hardening is more obvious at low temperature than that at high temperature, and the materials exhibit significant instability phenomenon at high strain rate (1-10s−1). The optimal process parameters for the deformed materials are higher temperature (623-673K) and lower strain rate (0.001-0.01s−1). Dislocation slip, dynamic recrystallization and mechanical twinning have been observed for the deformed materials. Dynamic recrystallization is the main deformation mechanism of the deformed materials at higher temperature and lower strain rate. Twining is the main deformation mechanism of the deformed materials at lower temperature and medium strain rate, and that appears at earlier deformation stage in the material’s deformation process.