Semi-solid metal processing results in liquid segregation at the surface of the components. The pitting behavior of this surface layer of semi-solid metal processed alloy F357 was compared with the centre (or bulk) of cast plates in 3.5% NaCl aqueous solution. It is shown that pitting attack occurs preferentially in the eutectic regions at the interface between silicon particles and the alpha p...

We propose a new kinetic model for surface segregation during vapor phase growth that accounts for multiple segregation mechanisms, including mechanisms for terrace mediated exchange and step edge mediated exchange. The major result of the model is an analytic expression for the experimentally measured segregation length and profile broadening that can be readily calculated without the need for...

In this study, an Eulerian-Eulerian multi-fluid model (MFM) was used to simulate the segregation pattern of a conical fluidized bed containing ternary mixtures of equidensity TiO2‌ particles. Experimental 'freeze–sieving' method was employed to determine the axial mass fraction profiles of the different-sized particles, and validate the simulation results. The profiles of mass fraction for larg...

Visual texture segregation is the perceptual phenomenon illustrated in figure 17.1. In this image a rectangular area composed of small X-shaped patterns appears as a distinct region against a background of L-shaped patterns. This segregation occurs rapidly and unconsciously, without effort or search. The rectangular area composed of Tshaped patterns, however, does not appear as a distinct regio...

While SOFC perovskite oxide cathodes have been the subject of numerous studies, the critical factors governing their kinetic behavior have remained poorly understood. This has been due to a number of factors including the morphological complexity of the electrode and the electrodeelectrolyte interface as well as the evolution of the surface chemistry with varying operating conditions. In this w...

As the oxygen reduction reaction (ORR) becomes more critical for development of solid oxide fuel cells (SOFCs) that operate at 500700 C, the correlation between the surface chemistry and electrochemical performance is important to understand and enable design of cathode materials with optimal surface chemistry. Recently we demonstrated that elastic and electrostatic interactions of the dopant ...

Besides revealing excellent mechanical properties, compositionally complex alloys are also very promising candidates for applications in heterogeneous catalysis. The opportunity provided by the tremendously large composition phase space to explore new materials and tune properties design cycle is, however, intrinsically coupled with challenge of controlling surface segregation, which is general...