Influence of Friction Stir Process on the Physical, Microstructural, Corrosive, and Electrical Properties of an Al–Mg Alloy Modified with Ti–B Additives

Abstract

In this study, two successive methods were used to improve the grain structure and the mechanical and physical properties of Al 5052 aluminum alloy. The modifying elements, 0.99 wt.% of titanium (Ti) and 0.2 wt.% of boron (B), were added during the casting process. After solidification, single- and double-pass friction stir processing (FSP) were performed to achieve additional grain refinement and disperse the newly formed phases well. The addition of Ti–B modifiers significantly improved the mechanical and physical properties of the Al 5052 aluminum alloy. Nevertheless, only a 3% improvement in microhardness was achieved. The ultimate strength (US), yield strength (YS), and elastic modulus were investigated. In addition, the electrical conductivity was reduced by 56% compared to the base alloys. The effects of grain refinement on thermal expansion and corrosion rate were studied; the modified alloy with Ti–B in the as-cast state showed lower dimension stability than the samples treated with the FSP method. The grain refinement significantly affected the corrosion resistance; for example, single and double FSP passes reduced the corrosion rate by 11.4 times and 19.2 times, respectively. The successive FSP passes, resulting in a non-porous structure, increased the bulk density and formed precipitates with high bulk density.

Production of Hybrid Nanocomposites Based on Iron Waste Reinforced with Niobium Carbide/Granite Nanoparticles with Outstanding Strength and Wear Resistance for Use in Industrial Applications

“…The thermal mismatch between the Fe alloy matrix and the reinforcements (NbC and granite) in the nanocomposite samples, which actively contribute to the knowledge of the dL/L behavior, may be the source of the observed reduction in the dL/L and CTE values. Additionally, the lower CTE values of NbC and granite reinforcement (≈6.7 × 10 −6 and 7.8 × 10 -6 /°C) as compared to Fe–Cu alloy matrix (11.9 × 10 −6 and 16.5 × 10 −6 /°C, respectively) [ 38 ]. Therefore, adding ceramics to the Fe–Cu alloy leads to a decrease in the CTE value.…”

“…Since there are no previous studies on the CTE of Fe and its alloys, but there are studies on the improvement of CTE of metal alloys. For example, Reddy et al [ 39 ], Moustafa et al [ 40 ], and Moustafa et al [ 38 ] emphasized that reinforcing particles such as SiC, yttrium–silica fume, TiB 2 and tantalum carbide (TaC)–NbC have a significant effect on remarkable improving CTE of Al, Mg10Li5Al Alloy, Al–Mg alloy, Al–Cu alloy, respectively.…”

Effect of microwave sintering on the microstructure and mechanical properties of Al-Al2O3-Si3N4 hybrid composite fabricated by powder metallurgy techniques

“…33,34 However, the effect of ceramic particle addition on mechanical properties has always been greater. The possibility of good wettability with aluminum of ceramic particles, 35 especially Al 2 O 3 and Si 3 N 4 is also the main reason for their significant effect in the enhancement of mechanical properties.…”

Influence of Nano-Hybrid Reinforcements on the Improvement Strength, Thermal Expansion and Wear Properties of Cu–SiC–Fly Ash Nanocomposites Prepared by Powder Metallurgy

“…Also, it attributed to the lower CTE of SiC (∼3.6 × 10 −6 / °C) and FA (∼6.1 × 10 −6 / °C) compared with Cu matrix The obtained results are comparable with other literature. 15,44,45 Mechanical properties.-Generally, mechanical properties depend on several factors including particle size, shape, distribution of the ceramics, and method used. 46,47 The microhardness of Cu and Cu hybrid nanocomposite sintered at 700 °C, 800 °C and 850 °C shown in Fig.…”