Magnesium-based alloys remain poorly researched, particularly regarding their behavior and resistance under hydrodynamic loading conditions. Interest in these materials is driven by their low density, lower even than that of aluminum alloys, and their excellent pressure die-casting capability, leading to manufacturing components with high geometric accuracy and structural homogeneity. Due to their biodegradability and biocompatibility, recent research has focused on using them in reconstructive surgery devices, similar to Zn-Mg alloys. As the blood circulatory system can, at certain stages, be considered similar to a hydraulic system, it is subjected to hydrodynamic flow regimes, including cavitation erosion. In this context, the current research, conducted on the AM50 magnesium-based alloy, provides new insights into its behavior and structural resistance exposed to shock waves and microjets generated by cavitation. Cavitation tests were performed using a standard 20 kHz vibratory device on three material conditions: one semi-finished (initial) state and two aged, heat-treated states at 200 °C for 12 and 24 h. Analyses of the characteristic erosion curves, cavitation resistance parameters, and macro- and microstructural examinations of the eroded surfaces revealed that, compared with the semi-finished condition, the applied heat-treatment regimes increased the HV₅ hardness by 6.8–17% and the cavitation resistance by 27–61%.

The ongoing development of subtractive options for indirect restorations places clinicians in a position that requires adaptation, understanding and choosing of the most suitable option for the long-term survival of the restoration. Mechanical parameters represent important indicators of long-term success. Consequently, this research aimed to assess the impact of water sorption on the mechanical properties of two direct resin composites, Gradia Direct Anterior A2 and Filtek Z550 A2 and three CAD/CAM subtractively manufactured dental resin composites, Vita Enamic, Brilliant and Cerasmart. A total of one hundred specimens (50 control, 50 underwent this protocol: dehydration, immersion in distilled water for 30 days and then re-desiccation), standardized to the dimensions of 14 mm × 4 mm × 1.2 mm were subjected to three-point bending test (based on ISO 4049:2019 and ISO 6872:2015), in order to find out the flexural strength and the elastic modulus of the material at the breaking point. Then, the fractured sample surfaces were fractographical analyzed. Using the two-parameter Weibull approach, the Weibull modulus (m) and the characteristic strength (σ₀) were evaluated. In this investigation, the elastic modulus varied from 5.8 (Gradia Control) to 20.31 (Vita Degraded) GPa, with the upper limit close to the values of natural dentin (17.7–29.8 GPa). The values of flexural strength ranged from 174.47 (Brilliant Control) to 79.2 (Gradia Control), subtractively processed materials demonstrating higher flexural strength and elastic modulus values than the direct resin composites, which is related to their high inorganic filler content. All material groups, except for Gradia Control, had a flexural strength more than the 80 MPa minimum value needed to sustain masticatory force. The dehydration and hydration cycles did not have a statistically significant influence on the mechanical properties of the material. The fractographic analysis revealed fracture patterns and features associated with the microstructure, with the PICN category material being particularly notable. Weibull analysis revealed that the direct resin composite materials exhibited higher reliability, lower data scatter and CAD-CAM materials showed greater characteristic strength, with a notably high performance of the nano-hybrid direct resin composite.

This research demonstrates, for the first time, the integration of aero-titania material in sensor devices. An innovative approach for the practical application of aero-titania (aero-TiO₂) materials in photodetectors and the characterization under ultraviolet irradiation was assessed. The fabrication of aero-materials was carried out through the atomic layer deposition (ALD) of titanium dioxide ultrathin layers on a sacrificial network consisting of zinc oxide micro-tetrapods. This process was followed by a selective etching of the sacrificial ZnO template and formation of aero-titania hollow micro-tetrapods. The obtained material has been characterized using UV-Vis spectroscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. The development of photodetectors was achieved through the sequential spin-coating deposition of aero-TiO₂ onto an interdigitated ceramic electrode. The obtained results show that, for high-intensity ultraviolet, the maximum sensitivity was reached for the two-deposited-layer aero-TiO₂ sensor at about 23, since for the low-intensity UV the highest sensitivity was recorded for the one-deposited-layer aero-TiO₂ sensor at about 12. In terms of the responsivity, the highest response was obtained for the one-deposited-layer aero-TiO₂ sensor under low-intensity illumination, reaching about 1.23 × 10⁻⁴ A W⁻¹ cm⁻². Thus, the aero-TiO₂ structure demonstrates the practical viability and application potential of this emerging class of materials in advanced sensing technologies.

This case study focuses on the laboratory examination and material analysis of welded components in automotive production. The investigation included metallographic analyses, microstructural evaluations, and non-destructive testing methods to assess weld integrity. Key issues identified were the presence of thermal distortions, incomplete welds, and material defects such as micro-cracks and porosity. A detailed metallographic study revealed that improper cooling rates significantly affected the heat-affected zone (HAZ) and weld microstructure, leading to weaknesses in material strength and increased susceptibility to fatigue. Variations in cooling water flow during the welding process were examined, showing that an intermediate cooling flow rate produced the most consistent microstructural properties. The analysis also indicated the presence of stress concentrators at weld interfaces, which may lead to premature failure under operational stresses. Recommendations include optimizing cooling rates and post-weld heat treatment to enhance material resilience, ensuring long-term durability and performance of welded assemblies.

This study presents a comparative evaluation of two widely used chemical analysis techniques: scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX) and spectrophotometry. SEM-EDX is renowned for its ability to provide qualitative and quantitative elemental analysis at microscopic levels, making it a powerful tool for material characterization. On the other hand, optical emission spectroscopy, which analyses the light emitted by excited atoms, is highly effective for the rapid and precise quantification of elements in various sample types, especially metals and alloys. The research aims to assess the effectiveness, accuracy, and applicability of these techniques, by analysing identical samples (welding wire) using both SEM-EDX and spectroscopy, this study highlights the strengths and limitations of each method. Key parameters such as sensitivity, detection and data interpretation are compared to provide a comprehensive understanding of their performance in chemical analysis.

This paper provides an analysis of the fracture surface of aluminum alloy EN AW 6082 Submerged Friction Stir Processed. Processing was performed in multiple passes. The specimens taken from the material processed for the tensile failure test were also analyzed from the point of view of the failure surfaces. The investigation of these surfaces involved microscopic analyzes carried out with the help of scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) techniques, to study the microstructure, fracture surfaces and constituent elements of the analyzed area. Based on the conclusions obtained from the analysis of the fracture surface of the aluminum alloy EN AW 6082 Submerged Friction Stir Processed, recommendations can be made to improve the quality and reliability of the alloy. The results of this research contribute to the development of knowledge on Submerged Friction Stir Processed of aluminum alloy EN AW 6082.