SiC_P表面镀Ti改性对SiC_P/Al2014复合材料组织及力学性能的影响

Effects of Ti-coated SiC_P on structures and mechanical properties of SiC_P/Al2014 composites

采用盐浴镀的方法对SiC_P进行表面镀Ti处理,并通过搅拌铸造的方法制备了表面镀Ti改性SiC_P/Al2014复合材料。研究了镀Ti SiC_P的尺寸和体积分数对SiC_P/Al2014复合材料微观组织和力学性能的影响规律。结果表明:表面镀Ti处理能有效改善SiC_P在Al基体中的分散均匀性;但随着SiC_P体积分数提高,相同尺寸的镀Ti SiC_P在Al基体分散均匀性逐渐变差,当SiC_P体积分数相同时,其在Al基体中的分散均匀性随着SiC_P尺寸的增加逐渐变好。SiC_P尺寸相同时,SiC_P/Al2014复合材料的常温拉伸强度随颗粒体积分数的增加先增大后减小,SiC_P尺寸为5μm和10μm的SiC_P/Al2014复合材料抗拉强度在颗粒的体积分数为4%时达到最高,分别为524MPa和536MPa;SiC_P/Al2014复合材料的高温(493K)抗拉强度随着SiCp体积分数增加而增大,SiC_P尺寸为5μm和10μm的SiC_P/Al2014复合材料抗拉强度在颗粒体积分数为6%时达到最高,分别为308 MPa和320 MPa。

The surface of SiCPwas Ti-coated via melt salt,and the Ti-coated SiCP/Al2014 composites were fabricated by stir casting method.The effect law of size and volume fraction of Ti-coated SiCPon the microstructure and mechanical properties of SiCP/Al2014 composites were investigated.The results show that the Ti-coated processing could effectively improve the distribution uniformity of Ti-coated SiCPin Al matrix.When the size of Ti-coated SiCP keeps constant,the distribution uniformity of Ti-coated SiCPin Al matrix decreases with increasing volume fraction of SiCP.When volume fraction of SiCPkeeps constant,the distribution uniformity of Ti-coated SiCPin Al matrix increases with increasing size of SiCP.When size of SiCPkeeps constant,the tensile strength of SiCP/Al2014 composites at room temperature increases first then decreases with increasing volume fraction of particles.The SiCP/Al2014 composites with 4% volume fraction of particles possess the highest tensile strength,i.e.,composites containing SiCP with sizes of 5μm and 10μm correspond to tensile strength of 524 MPa and 536 MPa,respectively.The tensile strength of SiCP/Al2014 composites at high temperature（493K）increases with increasing volume fraction of SiCP.SiCP/Al composites with 6% volume fraction of particles possess the highest tensile strength.The composite with5μm-SiCPexhibits tensile strength of 308 MPa while that with 10μm-SiCP exhibits tensile strength of 320 MPa when the volume fraction of particles is 6%.