Fabrication of Al-based matrix composite reinforced with WAl_(12) intermetallic particles by press-forming process using high-energy ball-milled powders

摘要

The 22wt%WAl_(12) intermetallic particulate reinforced Al-based matrix composite was successfully fabricated by press-forming technology using high-energy ball-milled powders. X-ray diffraction analysis shows that WAl_(12) reinforcement phase has been obtained after in situ reaction of Al matrix with W_(14)Al_(86) alloy at 620°C. The mechanical properties of the composite material were studied at room temperature. The Young's modulus, microhardness and the maximum ultimate tensile strength of this composite material can reach 75GPa, 1.51GPa and 471MPa, respectively. The results show that there is a good interfacial bonding between the Al matrix and WAl_(12) particles. However, the composite cannot be applied in high temperature environment because of its fairly low strength residual ratio.