针对 SiC/Al 复合材料搅拌摩擦加工工艺参数敏感的挑战，本研究以 25%SiC(质量分数)+1.5%TiO2(质量分数)+1%CNT/Al(体积分数)-1%Cu(质量分数)为原料制备的复合材料为对象，探究搅拌摩擦加工行进速度对微观组织与力学性能的影响规律，为制动盘工艺优化提供依据。 采用粉末冶金工艺制备基体材料，通过单道次搅拌摩擦加工(行进速度分别为 50 和 100 mm/min)得到 FSP50、FSP100 试样。 通过微观组织分析及拉伸性能测试，系统研究了搅拌摩擦加工行进速度对复合材料微观组织、室温及 300 ℃拉伸性能的影响。 结果表明，FSP 通过剪切-流变协同作用促进 SiC 颗粒均匀分布；通过热-力耦合作用细化 Al3Ti 及 Al2Cu 颗粒尺寸；晶粒尺寸随行进速度增加而细化；FSP100 通过细晶强化和组织均匀化提升室温强度， 抗拉强度达 407 MPa；300 ℃下基体软化与界面退化导致复合材料强度下降；FSP 引入的细小 SiC 颗粒界面在高温下更易发生脱粘。

To address the challenge of determining the process parameter sensitivity in friction stir processing (FSP) of SiC/Al composites, this study investigated the influence of travel speed on the microstructure and mechanical properties of a25 wt.% SiC+1.5 wt.% TiO2+1 vol.% CNT/Al-1 wt.% Cu composite, aiming to provide a theoretical basis for optimizing the manufacturing process of brake discs. The base material was fabricated via powder metallurgy, and single-pass FSP was subsequently conducted using travel speeds of 50 mm/min (sample FSP50) and 100 mm/min (sample FSP100). Through microstructural characterization and tensile testing, a systematic analysis was conducted to evaluate the influence of travel speed on the microstructure and tensile properties at both room temperature and 300 ℃ .The results indicate that FSP promotes a homogeneous distribution of SiC particles through the combined effects of shear and rheological flow; the thermomechanical coupling during FSP effectively refines the Al3Ti and Al2Cu particles, and the grain size decreases with increasing FSP travel speed. FSP100 exhibits an enhancement in room-temperature tensile strength, reaching 407 MPa, which is attributed to increased grain boundary strengthening and improved microstructural homogeneity; at 300 ℃ ,the composite strength decreases due to matrix softening and interfacial degradation. The fine SiC particle-Al interfaces introduced by FSP are more susceptible to debonding under high-temperature conditions.