论文部分内容阅读
采用直接电热法真空触变成形工艺制备体积分数为60％的SiCp增强6061铝基复合材料,研究了固溶-时效处理对复合材料抗弯强度及硬度等力学性能的影响,探讨了SiCp表面改性对复合材料微观组织和热膨胀性能的影响.研究表明,复合材料在530℃×11h固溶、175℃×15h时效工艺下,获得最高的硬度和抗弯强度;高温氧化和搅拌酸洗能使SiCp尖角产生钝化,提高增强颗粒在基体中分布的均匀性,使SiCp与铝基界面结合得到改善,孔隙率减少,抗弯强度提高,热膨胀系数提高,且酸洗态性能优于相应氧化态性能.“,”60 ％ SiC particles(volume fraction) reinforced 6061 aluminum alloy composites were fabricated by direct electro thermal vacuum forming process.The effects of solid solution and aging treatment on flexural strength and hardness of the composite prepared were investigated,and the optimized heat treatment process parameters were presented.The influences of surface modification of SiC particles on the mechanical properties of the composites were analyzed.The result reveal that with the solid solution,the mechanical properties of the composites can be improved,where the maximum hardness and flexural strength can be obtained at 530 ℃ for 1 h and aging at 175 ℃ for 15 h.Due to high temperature oxidation and mixing pickling pretreatment,SiC particles are passivated,which can improve uniformity of particle distribution in the matrix and improve the interfacial bonding of SiC particles and aluminum matrix interface,so the porosity is decreased,and the flexural strength and coefficient of thermal expansion are increased.In addition,the performance of the composites with SiC particle after pickling is better than that of the corresponding oxidation state.