Research on In-situ TiB_2 Particles Reinforced Al-Si Matrix Composite
Based on the thermodynamic analysis of Al-TiO2-KBF4-Na3AlF6 reaction system,TiB2/Al-18%Si composite was prepared by directional melt reaction in-situ synthesis process.The phase composition,microstructure,the distribution of TiB2 particles on the matrix and hardness of the composite were investigated by XRD,OM,EPMA,SEM and sclerometer,respectively.The results indicate that there are Al,Si and TiB2 phase in the composite.The in-situ TiB2 particle is less than 1.0 μm,and uniformly distribute in Al-18%Si matrix alloy.Compared with matrix alloy,the hardness of the composite dramatically improves.