Fabrication and mechanical properties of carbon fiber reinforced magnesium alloy composite by squeeze casting

摘要

Carbon fiber reinforced magnesium alloy is commercially attractive to practical structural applications due to their high specific mechanical properties. In this study, the optimum fabricating condition of squeeze casting was investigated. Then the mechanical properties of obtained carbon fiber reinforced AZ91D composites were investigated. In order to increase compressive strength of the preform and prevent each carbon fiber from contacting, sodium silicate solution was used as a binder, SiC particles were also used as spacers in the preform. The lowest preform deformation was found in the obtained composites at the condition, which is 873 K pre-heating temperature of the preform and 94 mm/s infiltration rate. This result was consistent with estimated preform deformation by the Daley's law. The flexural strength of the composite has wide scatters between 226 and 1495 MPa. It is found that the higher uniformly distribution of fibers and the decreasing amount of contacting fibers lead to the higher strength.