Research Of Preparation Technology Of High Performance And Low Cost Aluminum Composite Materials

This paper researched the effect of rolls density and hot pressing deformation on SiCp/Al composite, and analysis the microstructures and mechanical properties of SiCp/Al composite. Then choose the best cold density, and secondary hot pressing distortion. The results of the study shows that:(1) This paper studies the preparation process of 12vol.% SiCp/2024 Al composite: sintering cold and thermal deformation preparation,it shows that this method can meets the performance index of composite materials, various process parameters are: the cold density 85%; Sintering process 580℃×120 min; Hot pressing deformation amount 45%; Cold of sintering blank send density is 82.7%, through the thermal deformation later can achieve 97% above.(2) When deformation is 45%, SiC particle extends along the direction of the deformation deformation as streamlined. The higher the deformation, the higher density of SiCp/Al composite material.when the deformation amount to 54%, SiCp/Al composite density is 2.8092 g/cm3, send density reached 99.81%. When deformation amount to 54%, composite materials in the strength of the lateral for 375 MPa, tensile strength for 530 MPa; The performance of the longitudinal relative to the direction to lower in diameter, deformation amount to 54%, yield strength for 360 MPa. The elongation and section shrinkage rate of the material are better than the vacuum sintering state ,each was increased by 166.7% and 233.3%.(3) Cold sintering and thermal deformation can be used to prepare SiCp/Al composite materials, the density of cold sintering entirely for 82.7%, after thermal deformation can achieve 97% above.The SiCp/Al composite material after Vacuum compression deformation, yield strength can reach 325 MPa, tensile strength can reach 460 MPa; The thermal deformation of SiCp/Al composite material yield strength can reach 315 MPa, tensile strength can reach 455 MPa. Through second time deformation the performance of SiCp/Al composite materials is greatly improved.