Synthesis and characterization of magnesium-titanium carbide nanocomposites via friction stir processing: An in-depth parameter investigation

Abstract

Magnesium Metal Matrix Composites (MMMCs) possess remarkable mechanical and metallurgical properties that have garnered the interest of researchers worldwide. The current research endeavors to synthesize nanocomposites based on magnesium (Mg), specifically AZ31B, by employing Friction Stir Processing (FSP) and integrating nano-titanium carbide (TiC) as a reinforcing element. Additionally, the impact of various FSP parameters, encompassing transverse speeds (35 and 70 mm/min) and tool rotation speeds (850 and 1700 rpm), on the metallurgical, wear, and mechanical properties of the developed MMMCs was investigated. The microstructural analysis revealed that employing the FSP technique led to a uniform dispersion of nano-TiC reinforcement particles within the base matrix of the AZ31B Mg alloy. This concurrent distribution played a crucial role in both refining and evolving the grain sizes, subsequently leading to improvements in the composites’s mechanical and wear characteristics. To be more specific, the grain size witnessed a reduction by nearly 18 times, the microhardness increased by approximately 2.54 times, and the ultimate tensile strength (UTS) showed a 2.08-fold increase when compared to the base alloy. Furthermore, in contrast to the base material characterized by an adhesive wear mechanism, the presence of scratches indicates that the abrasive wear mechanism predominated in the case of the AZ31B/TiC nanocomposite. The outcome of the results depicts that the nanocomposite fabricated at a tool rotation speed of 1700 rpm and 70 mm/min transverse shows better mechanical and tribological characteristics than other developed composites and the base alloy.