Fabrication and Mechanical Property of High Strength-Plasticity TiB2P/Al Composites

Based on the easily-formed preform made of the mixture of TiB2 particles and aluminum powder, 20% TiB2P/6061Al composites (volume fraction) were fabricated by pressure infiltration method; subsequently, the composites were hot extruded with 10:1 extrusion ratio. The microstructures and mechanical properties of the composites before and after hot extrusion were studied with SEM, TEM and a tensile machine. Results show that the composites after hot extrusion exhibit better tensile strength, such as the tensile strength of 447.5 MPa, elastic modulus of 121.8 GPa and large elongation of 7.95%. The high strength-plasticity for the composites is attributed to the interfacial bonding strength and grain refining strengthening and precipitation strengthening.