Browsing by Author "Aravindh, G."

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Effect of Samarium (Sm) Addition on Microstructure and Mechanical Properties of AA5083 Alloy
(Springer Science and Business Media Deutschland GmbH, 2024) Aravindh, G.; Kumar, G.V.P.; Udaya Bhat, K.
Researchers are interested in reaping the potential benefits of incorporating small amounts of rare earth elements into aluminum alloys to attain finer grain size and to improve mechanical properties like toughness. This research investigates the effects of samarium (Sm) addition at concentrations of 0.5%, 1.0%, and 1.5% by weight on the microstructural and mechanical properties of AA5083 alloy. Optical microscopy (OM), field emission gun scanning electron microscopy (FEGSEM), X-ray diffraction (XRD), tensile testing machine (UTM), Vickers microhardness testing, and Charpy instrumented impact test were employed to evaluate the microstructure and mechanical properties of both as cast and solution treated (ST) samples. The samarium (Sm) is a beneficial grain refiner, leading to tailored properties in the AA5083 alloy. The results indicate that adding 1 wt% Sm generated significant enhancements in mechanical properties, such as tensile strength increased by 236 MPa and an elongation of 13.1% with a 27% reduction in grain size. However, incorporating 1.5 wt% Sm had an adverse impact on material properties, such as the grain size of the material increased by 22.73% and reduction in the tensile strength by 31%, corresponding to 1 wt% Sm added AA5083 alloy. Impact energy was reduced with the addition of Sm to the AA5083 alloy, both in as cast and ST samples. Furthermore, fractography was performed after impact and tensile testing. © American Foundry Society 2023.
Enhancement of mechanical and tribological properties of Sm-modified Al5083 Alloy through multiaxial forging
(Elsevier B.V., 2025) Aravindh, G.; G V, P.K.; Bhat K, U.
The combination of microalloying and severe plastic deformation (SPD) has emerged as a promising strategy for enhancing aluminum alloys' mechanical and tribological properties. This research examines the impact of adding samarium (Sm) to the Al 5083 alloy, followed by multiaxial forging (MAF) at room temperature with a 0.21 strain per pass. The alloy underwent three forging cycles, and its microstructure, mechanical, and tribological properties were assessed using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), universal testing machine (UTM), Vickers microhardness, and reciprocating sliding wear tests. The findings revealed that with each successive forging cycle, the properties of the alloy improved. Following the third cycle, a noticeable reduction in grain size was observed. The highest achieved hardness and tensile strength were 130 ± 3 HV and 380 ± 9 MPa, respectively. Additionally, the wear resistance of the alloy demonstrated significant enhancement, as evidenced by reduced wear volume loss after the third MAF cycle. The specific wear resistance values were 2.2 × 10?³, 2.6 × 10?³, and 1.3 × 10?³ mm³/N-m, while the wear volume loss values were recorded as 12.3 × 10??, 26.3 × 10??, and 21.9 × 10?? µm³ for loads of 1, 2, and 4 N respectively following the third cycle of MAF process. © 2025 The Author(s)
Enhancement of Microstructural, Mechanical, and Tribological Properties of AA5083 Alloy via Multi-axial Forging
(Springer, 2025) Aravindh, G.; Sahoo, B.; Kumar, G.V.P.; Udaya Bhat, K.
The present study investigates the influence of multi-axial forging (MAF) on the microstructure, mechanical, and wear properties of the AA5083 alloy. After solution treatment, the alloy was subjected to three MAF cycles at room temperature with a strain of 0.63 per cycle. The evolution of the microstructure was analyzed using optical microscopy, field emission gun scanning electron microscopy, and x-ray diffraction. Mechanical properties were evaluated through tensile testing, and Vicker’s micro-hardness and wear behavior of the alloys were investigated using reciprocating wear tests. The results demonstrated significant improvement in properties after the third MAF cycle, forming 8.3 ?m wide shear bands and a refined grain structure. The alloy achieved maximum hardness (130 HV), tensile strength (334 MPa), and elongation to failure (8.01%), along with a reduced strain-hardening exponent (0.27). Wear resistance showed marked enhancement, with wear volume reductions of 36%, 49%, and 21% under 1, 2, and 4 N loads, respectively. Similarly, wear rates decreased by 64%, 49%, and 15% under the same loads. These findings emphasize the MAF process's effectiveness in enhancing the mechanical and wear properties of AA5083 alloy, indicating its potential for advanced material processing techniques. © ASM International 2025.
Influence of Samarium (Sm) Addition on Mechanical and Tribological Performance of the Al–Mg Alloy AA5083
(Springer Science and Business Media Deutschland GmbH, 2025) Aravindh, G.; Sahoo, B.; Kumar, G.V.P.; Udaya Bhat, K.
Using rare earth elements as minor additives in aluminum alloys has become a promising strategy for enhancing their properties. This study specifically investigates the effects of introducing samarium (Sm) as a minor addition to the Al–Mg alloy AA5083 and analyzes the resulting changes after casting and subsequent solution treatment. The solution treatment process involved heating the alloy to 475 °C for 12 h, followed by rapid cooling in water. Various assessments, including compression testing, differential scanning calorimetry (DSC) analysis, and wear testing, were performed to evaluate the alterations of mechanical, thermal, and tribological characteristics. The results indicate that adding Sm significantly improves the mechanical strength, thermal stability, and wear resistance of the AA5083 alloy. Wear properties demonstrate that the AA5083 alloy with 1 wt.% Sm exhibited superior performance for both as-cast and solution-treated alloys compared to other alloys. These enhancements highlight the potential of incorporating rare earth microadditions to enhance the performance characteristics of aluminum alloys for a wide range of industrial applications. © American Foundry Society 2024.