Influence of nano-TiO₂ particles on the microstructure, mechanical and wear behaviour of AA7178 alloy matrix fabricated by stir casting technique

Abstract

The current study focuses on the influence of varying wt% of nano-TiO2 particles (1%, 2% and 3%) on the microstructure, mechanical and tribological properties of AA7178 alloy matrix composite produced by stir casting method. The grain boundaries of the prepared composites were revealed using an optical microscope. The uniform distribution of nano-TiO2 particles in the alloy matrix was observed by scanning electron microscope. X-ray diffraction verified the existence of reinforced nano-TiO2 particulates in the samples, and microstructural images revealed a consistent distribution of reinforcements in the matrix. The formation of more refined grains from coarser grains was observed using electron backscatter diffraction analysis. The texture analysis revealed the presence of dominant A and A2* components with a maximum intensity of 5.137. Fractography disclosed that the reinforcements did not peel away from the alloy matrix, and the form of failure was both brittle and ductile. Abrasive wear was observed for the worn-out surface of the nanocomposites. It was observed that by increasing wt% of TiO2 nanoparticles, the mechanical and tribological properties of the alloy matrix increased compared to the base alloy. The optimum mechanical and tribological properties were obtained at 2 wt% of nano-TiO2 particulates.

Influence of TiC Particles on Mechanical and Tribological Characteristics of Advanced Aluminium Matrix Composites Fabricated through Ultrasonic-Assisted Stir Casting

“…No clustering or micro-pores were observed, indicating a homogeneous dispersion of TiC particles. Furthermore, increasing TiC content from 0% to 8% leads to a refinement of grain size from coarse to fine, consistent with previous studies [44]. The microstructure of the aluminium casting alloy with high titanium content is defined by the presence of dendrites during its solidification.…”

Incorporating Optimization to Improve Durability of A356 Metal Matrix Composites with Nanoparticles of TiO2 and SiC

“…The excellent strength-to-weight ratio of these composites makes them useful in an extensive range of aeronautical, automotive, and industrial applications. Ceramic particles like SiC, B4C, Al2O3, ZrB2, TiO2, Si3N4, etc., are one of many possible materials for the reinforcement particles utilized in AMMCs [1][2][3][4][5][6][7][8][9][10][11][12][13]. It is important to consider the intended usage and qualities of the composite when choosing the reinforcing material.…”

Advancing Aluminum-Based Composite *Manufacturing: Leveraging TiO2 Reinforcement through Stir Casting Technique

“…Stir casting is a widely used manufacturing process for producing metal matrix composites, including aluminum-based composites [27]. In this process, solid particulate reinforcements, such as ceramic or metallic particles, are dispersed into a molten metal matrix while being agitated or stirred [28]. The primary objective of stir casting is to achieve a uniform distribution of the reinforcement particles throughout the metal matrix, enhancing the mechanical, thermal, and/or electrical properties of the resulting composite material.…”