TiB2-Al2O3-TiAl3 particulates reinforced aluminum matrix composites were in-situ synthesized in Al-TiO2-B2O3 system by mechanically alloying method.Grain size and lattice distortion degree of TiO2 powder after milling were presented through comparatively analyzing the XRD curves of the powder before and after milling

furthermore

the milled powder was observed by ESEM and TEM.The transformation of phase compositions in process of in-situ synthesis was observed with raw materials at different milling time for 1

2

3 hours by XRD and ESEM.The microstructure and mechanical properties of the composites prepared by hot-pressing sintering milled powders were investigated by ESEM and TEM and tensile testing.The results reveal that fine and uniformly distributed ceramic particulates with several micron in the matrix alloy can be observed

exhibiting desirable bonding with the matrix

and tensile strength of the composites reaches 327.4 MPa.