Influence of the grain boundary character on the temperature of transition to complete wetting in the Cu–In system

Abstract

The incomplete to complete grain boundary (GB) wetting transition is controlled by GB energy and, therefore, by GB character. To find the GB character dependence of the wetting transition, experiments were carried out on polycrystalline Cu-In alloys, which are known to exhibit wetting behaviour between 715 and 986°C. Electron backscatter diffraction was applied to determine the two-dimensional GB character, using the coincidence site lattice (CSL) model and applying the Brandon criterion. Special wetting behaviour was found in those GBs characterised as low-angle, R3 and R11. The low-angle and R3 GBs were not wetted until the sample melted, while the temperature for the transition to complete wetting of R11 GBs was over 100°C higher than that for complete wetting of all other types of GB, including other CSL GB as well as random GB. It might be that a different Brandon type criterion is needed in the case of GB wetting to show the ''special'' wetting behaviour of the CSL GBs.

Grain Boundary Wetting Phenomena in High Entropy Alloys Containing Nitrides, Carbides, Borides, Silicides, and Hydrogen: A Review

“…Above T w , it remains equal to zero until the melting point. This behavior of the contact angle has been observed in numerous binary systems [60][61][62][64][65][66]. The temperature dependencies of σ αα and σ ββ for GBs and IBs σ αβ have no obvious difference.…”

“…In this case, the α/α GB is replaced by a layer of the liquid phase L. As a result, the abutting grains are completely separated from each other by a rather thick liquid layer. In most cases, the contact angle, θ, between the GB and the melt decreases with increasing temperature [59][60][61][62][63] and reaches zero value at a certain temperature, T w , known as the temperature of GB wetting transition. This is the transition from incomplete to complete GB wetting.…”

Wetting of grain boundary triple junctions by intermetallic delta-phase in the Cu–In alloys

“…The wetting phase at the grain boundaries is an intermetallic d [18]. In Cu-In alloys, wetting of GBs with melt was also observed [41,42]. Figure 4 shows the temperature dependence of the portion of wetted GBs and TJs.…”

The Grain Boundary Wetting Phenomena in the Ti-Containing High-Entropy Alloys: A Review

“…This situation is called complete wetting of the GB by the melt. In a number of systems, the angle between the GB and the melt decreases with increasing temperature [62][63][64][65]. Moreover, after reaching a certain temperature, Tw, the The typical microstructures of such two-phase polycrystals are shown in Figure 1 for the binary Al-Mg alloys.…”