Faculty Publications
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Item Fracture toughness investigations of AA6061-SiC composites: Effect of corrosion parameters(Elsevier Ltd, 2023) Ramesh, R.S.; M.v, S.K.; Begum, Y.; Doddamani, S.; K, M.K.The research gap in this problem lies in the limited understanding of how corrosion parameters, such as reinforcement composition, exposure time, and concentration of the corrosive agent, affect the fracture toughness of AA6061-SiC composites. Investigating these factors can provide valuable insights into the corrosion behaviour of AA6061-SiC composites and help optimise their mechanical properties for specific applications in harsh environments. The study aimed to optimise the parameters and find the best combination of composition, normality, and exposure time that improves fracture toughness. The study's results showed that normality (37%), and exposure time (47%) significantly affected the material's fracture toughness. Fracture toughness tests showed Case 1 had higher fracture toughness (18.35 MPa√m) due to lower normality and shorter exposure time, indicating a less aggressive corrosive environment. In contrast, Case 3 had lower fracture toughness (14.86 MPa√m) due to higher normality and longer exposure time, suggesting increased corrosion severity. In particular, increasing the exposure time and concentration of the corrosive agent decreased the fracture toughness. The composite was exposed to a 3.5% NaCl solution, which caused severe damage and formed a protective oxide layer. However, pitting corrosion occurs and causes decreasing in fracture toughness. © 2023 Elsevier B.V.Item Investigation on the Hardness of Al6061 Alloys: Implications of Seawater Corrosion(Springer, 2024) Begum, Y.; Doddamani, S.This study aims to investigate the impact of seawater corrosion on the hardness of Al-Mg-Si alloys, providing insights into the mechanical alterations induced by exposure to corrosive marine environments. Al-Mg-Si alloys are widely used in marine environments because of their high strength-to-weight ratio and excellent corrosion resistance. However, exposure to seawater can lead to corrosion, which can alter their mechanical properties, including hardness. In this study, Al6061 alloy specimens were exposed to seawater for different periods (3–30 days), and their hardness was measured using Vickers hardness testing. The corrosion rate was determined by weight loss analysis. The results showed that the corrosion rate of Al6061 alloys increased with increased exposure time in seawater, up to 20%. The hardness versus corrosion rate plot analysis indicates an inverse relationship, with scatter points aligning well with a linear regression model. The Vickers' hardness of the samples decreased as the corrosion rate increased. This hardness decline in Al6061 alloys under escalating corrosion rates is attributed to material loss, heightened porosity, and microstructural transformations arising from corrosion product formation. Comprehensive corrosion micrographs unveiled advanced corrosion stages, marked by dynamic pit and crack expansion, oxide layer degradation, pit coalescence, and emergence of distinct corrosion patterns. © The Minerals, Metals & Materials Society 2024.