Evaluating of the microstructure, texture, and mechanical properties of AA2024-Al3NiCu composites fabricated by the stir casting process

Effect of Age-Hardening Temperature on Mechanical and Wear Behavior of Furnace-Cooled Al7075-Tungsten Carbide Composite

“…Figure 8 b,c show that a greater amount of secondary phases were formed, such as Al 2 Cu, Mg 2 Si and MgZn 2, at the ageing temperature of 150 °C and 250 °C with fine grains and alloying elements of the composite form intermetallic compounds on the grain boundaries of the composite, which leads to an increase in the strength properties of the composites, as compared with the non-aged composite. This result is in line with what Farajollahi et al [ 56 ] reported, meaning that the presence of the nickel aluminide structure increased the hardness, strength, and toughness after homogenization treatment and Zhang et al’s work also supports this [ 57 ]. For the composite aged at 350 °C, Figure 8 d reveals that the dissolving of Al and Mg precipitates leads to the formation of a coarse grain, which decreases the strength of the composite due to the higher dislocation movement offered by AMMCs and the secondary phase of tungsten aluminide presences in the composite during age hardening at 450 °C, which leads to the increased strength of the Al7075-WC composite, as compared to the composite aged at 350 °C due to high stability of Al 5 W, which is analyzed by EDX and the results are plotted in Figure 8 e.…”