Effect of Liquid-Solid Extrusion on the High-Temperature Compressive Properties of Csf/Mg Composites

Short carbon fiber reinforced Mg matrix composites (C-sf/Mg) were prepared by an infiltration-extrusion integrated technique in which pressure infiltration and liquid-solid extrusion are performed continuously. Their compressive properties were evaluated in the temperature range 20-300 degrees C, and compared with C-sf/Mg composites fabricated by only pressure infiltration technique. The results show that after liquid-solid extrusion, the fiber tended to align along the extrusion direction, and a refined-grain microstructure was obtained, thereby contributing to a significant increase in both compressive strength and yield strength up to 200 degrees C, but they are abnormally lower than those of the infiltrated composite at 300 degrees C due to fiber rotation and a different deformation mechanism related to the finer grain structures.