This study investigated the tribological performance of hybrid composites composed of scrap carbon fiber (CF), glass fabric (GF), and polyamide 6.6 (PA6.6) through an innovative approach for reusing scrap CFs in high‐value composite structures. The experimental setup included CF/GF/PA6.6 hybrid composite laminates with varying CF contents and surface‐modified GFs, as well as PA6.6 sheets and GF/PA6.6 composite laminates. Solid particle erosion and scratch tests were conducted to assess the influence of scrap CF hybridization and GF surface modification on the tribological properties of the composites. The results demonstrated that neat PA6.6 sheets exhibited the lowest erosion rate, while the incorporation of CF and GF reinforcements had a detrimental effect on erosion resistance. The highest erosion rate was observed within the impact angle range of 15°–30° for pure PA6.6 sheets, whereas for composite laminates, it occurred within the range of 30°–45°. In contrast, CFs positively affected scratch hardness despite their negative impact on erosion resistance. Additionally, the silane treatment of GFs, which enhanced interfacial strength, improved the erosion resistance and scratch hardness of GF/PA6.6 composite laminates without CF. Profilometer‐based topographic analysis revealed a correlation between the average surface roughness of the eroded surfaces and the weight loss resulting from solid particle erosion.

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Titanium alloys have been extensively used in biomedical and aerospace applications, where the fatigue life and tribological behaviour are important. Shot peening is a cold working mechanical surface treatment and has been widely used to improve specifically the fatigue life of titanium alloys for the last decades. In this study, the effect of shot peening on the dry sliding wear behaviour of Ti6Al4V alloy was investigated. Moreover, the influences of peening time on the surface topography and the dry sliding wear behaviour of Ti6Al4V alloy were discussed. Ball-on-disc tests were carried out to investigate tribological behaviour and a 3D optical profilometer used to investigate the volume loss, the areal surface roughness, and the 3D surface topographies of shot peened Ti6Al4V alloy before and after wear tests. The areal surface roughness values increased with increasing peening time while dry sliding behaviour did not alter. The 3D surface roughness measurements of the peened and the worn specimens revealed the topographical variations of the specimens.