Effect of Sintering Temperature on Microstructure and Mechanical Properties of SiCp/2024Al Matrix Composites
SiCp/2024Al composite at different sintering temperatures was prepared by high speed ball milling+hot-press powder metallurgy technology with high-purity SiC particles and 2024 aluminium alloy powders as raw materials.The effects of different sintering temperatures on the microstructure and mechanical properties of the composites were investigated.The results show that the porosity of the composites is higher when the sintering temperature is lower,which is the main factor of the fracture failure of the composites.As the sintering temperature increases,the porosity of the composites decreases,the fracture failure of the composite is characterized by SiC particle brittle fracture,matrix alloy tearing and interface bonding failure and cracking.When the sintering temperature is 590℃,the microstructure of the composite is dense,and the tensile strength,hardness and elongation reach the maximum values of 364 MPa,106 HV and 7.6%,respectirely.
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