Effect of eggshell powder on the microstructural and thermal behavior of Al7075/waste eggshell surface composites produced by solid-state friction stir processing developed for potential thermal applications

Abstract Lightweight composite materials for potential thermal applications are the contemporary demand manufacturing and aircraft industries where possibility to improve tailor desired properties is based on application. Carbonized eggshell powder a solid lubricant with absorbent capability has proven as reinforcement metallic base composites. In present work, an attempt made investigate effect of carbonized chicken (3 9% by weight) microstructural Al7075 alloy processed solid-state friction stir processing. An infrared thermography three K-type thermocouples equipped plate at equal distances used measure temperature respect time. The comparative study microstructure grain structure analysis been done light microscopy, scanning electron backscattered diffraction methods. findings explored dynamic recrystallization recovery reduced size 6.2 10.3 µm varying percentage 9%) in zone. conductivity coefficient expansion (CTE) were measured range 50 400 °C. addition it, differential (DTA), thermo-gravimetric (TGA), derivative (DTG) conducted 25 900 °C discuss endothermic, exothermic nature, degradation characteristics. result revealed decreasing trend conductivity, CTE values found 97 53 W/mK 26.6 24 × 10 −6 K −1 (heating cycle), 27.2 23.8 (cooling respectively. Furthermore, higher lower 108 62 observed terminal voltages, 250 V 100 V, DTA, TGA, DTG curves maximum weight loss, which varies up 5.25% peaks decomposition steps each surface composite.