The attack on pure nickel, cobalt, and iron in the presence of pure sulphur vapours has been studied in the temperature range between 700 and 1150°C. The formation of liquid sulphides which penetrate along the grain boundaries of the solid metals has been detected. The dihedral angles have been measured as a function of temperature, and the temperature dependence of grain boundary and
Solidi/liquid interfacial tensions have been computed. The kinetics of penetration of the liquid phase along the grain boundaries have been established and interpreted using Mullins'analysis.
MST/248
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