Pressure effect on grain boundary wetting at various temperatures

Abstract

Abstract. Bicrystals of Fe-6 at.% Si alloy containing (001){001}$5 tilt grain boundaries with a deposited zinc layer have been annealed at various hydrostatic pressure at four temperatures between 700 ~ and 905~ After the anneals the dihedral angle 0 of the grain boundary groove formed at the site of the grain boundary intersection with the solid-melt interphase boundary has been measured. The transition from complete to incomplete wetting of the grain boundary by the zinc-rich melt (dewetting phase transition) has been found to occur as the pressure increased at all temperatures studied. The temperature dependence of the dewetting transition pressure pw has been determined. That dependence has a minimum at a temperature of 790~ which is close to the peritectic temperature in the Fe-Zn system (782~ A thermodynamic analysis of the wetting phenomena in the two-component system, based on Becker's regular solution model for the surface tension of the interphase boundary, explains the minimum in the p~o(T) dependence.

High-Pressure Influence on the Kinetics of Grain Boundary Segregation in the Cu–Bi System

“…The influence of high pressure on such interfacial phenomena as grain boundary (GB) wetting, GB diffusion and GB migration has attracted a great deal of attention in the recent decade [1][2][3][4][5][6]. The pressure effect on GB energy and GB wetting were successfully interpreted in terms of GB free volume: the GB energy increases with pressure proportionally to the GB free volume.…”