Effect of holding pressure on densification and mechanical properties of C_f/Mg composites

Abstract

Carbon fibre reinforced magnesium alloy matrix composites were fabricated by using liquid–solid extrusion directly following vacuum infiltration technique. The experimental results showed that the microstructures of C_f/Mg composites depended on the holding pressure. The porosity was reduced gradually, and the densification was improved obviously, respectively, with the increase of the holding pressure. The densification, hardness and Ultimate tensile strength of C_f/Mg composites were significantly improved as the holding pressure increased in the range of 0.1–15 MPa. The densification was not obvious, but the UTS of the C_f/Mg composites decreased gradually as the holding pressure increased in the range of 25–45 MPa. The C_f/Mg composites presented a good performance when the holding pressure was about 15 MPa.

Keywords:

• Holding pressure
• Microstructure
• Densification
• Mechanical properties
• C_f/Mg composites

Acknowledgement

This work was supported by the National Nature Science Foundation of China (No. 51472203, 51275417, 51521061), the National High-tech R&D Program of China (No. 2015AA8011004B), and the 111 project (No. B08040).