Study on Phase and Microstructure of B_4C/Al Composite
B4C/Al composite was fabricated by pressureless infiltration.The phase and microstructure of the composite were studied by XRD,EDS,SEM,TEM and optical microscopy.The results show that,Al3BC forms on the interface of B4C and Al,connecting aluminum with ceramic toughly.AlB2 as strip crystal forms between B4C and Al,which has higher fracture toughness.The boron carbide exists in the form of continuous skeleton structure,and the infiltrated aluminum exists in the form of continuous matrix.The fracture ways of B4C/Al composite are transcrystalline rupture of ceramics skeleton and crack bridging of Al.