EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

The wetting behavior of surfaces strongly depends on their roughness. In this work we investigated the influence of surface roughness of Ti6Al4V alloy on the adhesion of HEK293 human cells. The array of linear scratches has been produced on the surface of cold-wrought Ti6Al4V alloy discs with the aid of various abrasive SiC papers at grades 220, 400, 600, 1000, 1200 and 2000 (number of grains...

Increase of wettability and interfacial tension modification are not only present in advanced material’s technology, but also in biological tissues, such as the pulmonary surfactant formed by alveolar cells. Regarding human technology, the most common approaches are the use of chemical surfactants such as soap, temperature increase and surface treatments (coatings and texturing). During the...

CMCs (ceramic matrix composites) provide interesting properties when they are employed in applications that must withstand harsh environments. These materials overcome the limit of utilization due to the brittleness of ceramic materials and they have been experiencing a growing popularity in aerospace and energy fields.
CMCs often need to be integrated together with themselves or dissimilar...

Locally reinforced metal matrix composites (MMCs) are one of the most promising materials suitable to manufacture metallic parts with high wear resistivity. Currently MMCs can be produced by ex-situ and in-situ methods. For liquid-assisted techniques, the main phenomena determining the structure and properties of MMCs are wettability and reactivity. In this study, high temperature interaction...

Nano-multilayers (NMLs) are functional nano-architectures, which physical properties can be tailored by smart microstructural and interfacial design. Upon thermal treatment, the layered structure of NMLs of immiscible metals degrades. The driving force of the degradation is of capillary nature i.e., the system tends to decrease the energies of interfaces.
In the present work, the degradation...

Liquid aluminum (Al)/solid nickel (Ni) is a common system in casting, brazing, coating and welding processes. The properties of the final products for such processes are closely related to the wettability between the liquid and solid at high temperature. However, wettability studies on liquid Al/solid Ni systems are still limited due to the difficulty in performing wetting experiments and the...

Many industries depend on products formed at interfaces between liquids and solids, in other words during a wetting process. Due to the complexity of the wetting process especially for a highly reactive wetting system like liquid Aluminum (Al)/solid Nickel (Ni) at high temperatures, lab experimental study on the nucleation and growth of intermetallics is still limited.
Nanoscale simulations...

The wettability and infiltration of molten ZrSi2 and ZrSi2-Lu2O3 alloys into Cf/SiC and B4C-infiltrated Cf/SiC composites were investigated to understand the interfacial interactions that occur during the development of Cf/SiCZrC and Cf/SiC-ZrB2-ZrC-Lu2O3 materials. A significant evaporation of Si from the liquid affected the wetting behaviour of the alloy when tested in a vacuum at 1670 °C....

The extreme conditions of pressure and temperature during Ni/Ti alloys clads joining via the explosive welding process significantly influence the microstructure of the bonding zone, which has a direct impact on the quality and reliability of the connection. Thus, the detailed microstructural characterization of the welded zone is particularly important to design the optimal parameters of the...

The concept of nanocomposite lead-free solders has provided a promising approach to improve mechanical reliability of solder joint. Minor additions of metal nanoparticles into the commonly used Sn-Ag-Cu solder impact on the morphology of both the solder alloy and solder/Cu joint.
The present research is the follow-up of our previous studies and summarises the influence of nano-sized metal...

In this work, the wetting phase transition of grain boundaries (GBs) and their triple junctions (GB TJ) by the second solid phase in the magnesium-based alloy EZ33A is studied. The condition for complete wetting for the GB TJ (GB > SS) is weaker than for GBs (GB > 2 SS). Therefore, if the transition from partial to complete wetting occurs with increasing temperature, then all GB TJs...

Thermal energy storage systems using metallic alloys require chemically compatible containment. Where the container sits between the storage material and a heat exchanger, good thermal contact is also important. In order to select such a container, processes at the liquid-solid interface between the metallic phase change material and the housing material have to be understood. Low reactivity...

Electroless nickel immersion gold (ENIG) layers are widely applied in the electronics industry and the quality of interconnections is directly related to its thermal stability, which in turn has a direct impact on the processes occurring at elevated temperatures during the soldering process or later during use of the final product (heating/cooling cycles). The additives such as W, Mo, Co, Re...