Effect of Nano Particle Size on Mechanical and Fatigue Behavior of TiO2 Particular—Reinforced Aluminum Alloy Composites

Abstract

Aluminum alloys are among the most widely used materials in the parts and vehicle sectors due to their high strength-to-weight ratio and qualities such as higher corrosion and wear resistance, as well as minimal thermal growth when compared to other metals. This research involved matrix alloy AA7075 aluminum reinforced with constant 7 wt. % TiO2 (with different particle sizes 30, 70, and 100 nm). The goal of this study is to improve the mechanical (impact strength and young modulus) and fatigue properties of AA7075 alloy-based metal matrix composites, and fatigue. AA7075 composites with a constant weight percentage of 7wt.% of TiO2 and variable particle size have been successfully synthesized by the stir casting route. Microstructural examinations revealed that nanocomposites with (30nm) particle size have better distribution and less porosity compared to the other particles size. The nanocomposite having 30 nm particle size was found to have maximum improvement UTS and YS in comparison with the other nanocomposites, 20.45%, and 12.87% respectively, and minimum elongation. An increase in particle size and fatigue results indicates the decreasing trend of fatigue life and strength. The higher endurance fatigue limit was recorded to be (23.875 MPa) for (30 nm) nanocomposite.