Optimizing Friction Stir Processing for Al-Fe Composites: Enhancing Mechanical Properties through Statistical Analysis
摘要
This study investigates the optimization of friction stir processing (FSP) parameters to enhance the mechanical properties of aluminum-iron (Al-Fe) composites using AA 5083-H111 as the base material. The research employs a Taguchi L27 orthogonal array to systematically optimize key process variables, including tool shoulder diameter (TSD), tool rotational speed (TRS), and tool traverse speed (TTS). The effects of these parameters on microstructure, grain size, ultimate tensile strength (UTS), and microhardness were analyzed using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and mechanical testing. The results demonstrate that increasing TSD to 21 mm and maintaining TRS at 900 rpm and TTS at 63 mm/min significantly improved the composite’s mechanical properties. The second pass of FSP refined grain size, enhanced particle dispersion, and improved mechanical performance, achieving UTS up to 84% of the base material strength. Analysis of variance (ANOVA) identified TSD as the most influential parameter (14.63% contribution) in enhancing weld quality. Fractographic analysis confirmed a ductile–brittle failure mechanism with fine dimples and intergranular fracture features. The findings underscore the effectiveness of multi-pass FSP in optimizing Al-Fe composites for advanced engineering applications, particularly in the aerospace and automotive industries.