Materials Science Forum Vol. 1163

Abstract: This study aimed to achieve superior sealing surface quality through a cutting process utilizing a non-rotational cutting tool. Previous research has explored the suppression of chatter vibration using indexable non-rotational cutting tools fabricated from damping alloys. The experiments employed a custom indexable tool composed of a damping material (M2052), with cemented carbide as the insert material. Prior research has indicated that non-rotating cutting tools incorporating damping alloys exhibit enhanced suppression of chatter vibrations, compared with traditional non-rotating tools. This study extends the enquiry to assess the effects of the cutting edge shape on the stability of cutting operations using non-rotational cutting tools with damping alloys. To investigate the effect of the cutting-edge shape on the machined surface, the cutting forces were measured using a dynamometer, the machined surface was measured using a white light interferometer, and the residual stresses were measured using an X-ray residual stress analyzer. Consequently, the insert with a large cutting width had a large variation in the cutting force and caused the generation of compressive residual stress, depending on the conditions. However, it is clear that the insert with a small cutting width exhibited a small variation in the cutting force and generated tensile residual stress, resulting in stable cutting.

Abstract: This study investigates the thermal distribution in high-stregth AA2124/SiC/25p-T4 metal matrix composite during friction stir welding (FSW), a process that allows welding of these materials that are difficult or impossible to be welded by conventional welding methods. To understand the process mechanisms, a transient, 3D thermo-mechanical finite element mode (FEM) was developed. The model calculates temperature distribution during FSW welding by considering boundary conditions such as rotational speed, welding speed, tool pressure, tool diameter and material properties, accounting for conduction and convection heat transfer. The numerical results are validated against experimental data, demonstrating the model’s effectiveness in predicting the impact of varying parameters and aiding in the selection of optimal welding conditions before costly physical trials.

Abstract: This paper presents an analysis of the fracture surface of the EN AW 7075 aluminum alloy, processed through submerged friction stir processing in water. Multiple passes were used during processing. Specimens prepared from the processed material were also examined with a focus on their fracture surfaces in relation to tensile failure. The investigation of these surfaces included microscopic analyses using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) techniques to examine the microstructure, fracture surfaces, and elemental composition of the analyzed area. Insights from the analysis of the fracture surface of the EN AW 7075 aluminum alloy processed by submerged friction stir processing in water provide a basis for recommendations to enhance the alloy's quality and reliability. The findings of this research advance knowledge on submerged friction stir processing in water for the EN AW 7075 aluminum alloy.

Abstract: This research focuses on the detailed analysis of fracture surfaces in aluminium alloy EN AW 1200, processed through underwater friction stir processing. The material was subjected to multiple processing passes, and tensile failure specimens were subsequently extracted for further analysis. Microscopic evaluation of the fracture surfaces was conducted using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). These advanced techniques were employed to examine the microstructure, fracture morphology and elemental composition of the processed material. Insights gained from the analysis of the fracture surfaces of aluminium alloy EN AW 6082, similarly processed through underwater friction stir processing, provide significant findings. These insights can guide improvements in both the quality and reliability of the aluminium alloy in question. The findings from this study contribute to the existing body of knowledge on underwater friction processing, offering important information related to the mechanical performance of aluminium alloy EN AW 1200.

Abstract: Cast aluminium alloys are widely utilized in various industrial applications due to their favourable properties. A comparative analysis of fracture surfaces for EN AC 5083 cast aluminium alloy specimens processed in a single-pass by friction stir processing (FSP) and submerged friction stir processing (SFSP) has been carried out in this paper. Fracture surface evaluation involves mechanical tensile tests, microscopic investigations using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) to analyse the microstructure, fracture characteristics and elemental composition of the processed material. The findings provide valuable insights into the fracture behaviour of EN AC 5083 aluminium alloy FSP and SFSP processed, contributing to further research on optimizing friction stir processing techniques in ambient and submerged process conditions.

Abstract: In recent years, interest in incorporating recycled materials in the construction industry has grown significantly, driven by the urgent need to mitigate the environmental impact that this activity generates on a daily basis. This interest is not only due to the growing awareness of environmental preservation, but also to the sustainability requirements imposed by international and national regulations [1]. The inclusion of recycled materials has piqued the interest of several researchers. Recycled glass, due to its particular characteristics, has been the subject of numerous studies in the field of construction. Research has shown that incorporating crushed glass into mortar and concrete mixtures can improve certain mechanical properties [2], such as compressive strength and thermal conductivity, as well as significantly reduce the amount of solid waste that is deposited in landfills [3]. These findings highlight the importance of investigating with precision and scientific rigor the effects of recycled glass on concrete performance [4]. In Peru, the need to promote sustainable construction practices has encouraged research on the use of recycled glass in the production of concrete. This research focuses on evaluating, through controlled tests and scientific methods, how the inclusion of recycled glass can influence the mechanical properties of concrete, especially its compressive and tensile strength. The systematic evaluation of these factors will allow us to identify if this technique is viable for implementation in the construction sector, and if it can meet the sustainability criteria established in the Peruvian context [5].

Abstract: With the continuous development of novel concrete formulations incorporating various materials, a prevalent issue is their susceptibility to deterioration, which often results in the formation of cracks within the internal structure. This study mainly explores the impact of liquid concrete deep-penetration sealer (CDPS) on the durability of concrete. The evaluation of durability included compressive strength tests, abrasion resistance tests, permeability tests, and rapid chloride ion penetration tests. Although compressive strength and permeability are conventionally regarded as the primary metrics for assessing concrete performance in the industry, abrasion resistance is often overlooked. To address this gap, this study incorporated abrasion resistance testing to ascertain the sealer's efficacy in mitigating surface wear. This barrier mitigates the ingress of deleterious external agents, thereby enhancing the overall durability of the concrete. Furthermore, the results highlight the potential of such treatments to significantly improve critical performance parameters, particularly in terms of wear resistance and resistance to chloride ion penetration, which are essential for prolonging the lifespan of concrete structures.