A method for preparing composites with the cross-sectional area ratio of punch to sheet less than 1 was pro-posed.The infiltration process was analyzed,and effects of different process parameters on infiltration quality were investigated.The optimized process parameters were presented as follows:pouring temperature of 950 ℃,preheating temperature of 560 ℃ and extrusion pressure of 35 MPa,which were used to prepare well-impregnated ring-shaped thin sheet.The density of fabricated composites is 14.8％lower than that of the matrix alloy,and the tensile strength is 125 MPa,which is 58％higher than that of the matrix.
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