In light of data on the melting points of the
boride (1124°C) and carbide (1168°C) eutectics at the given concentrations of activating addition in [9], this is
obviously explained by increase in the amount of liquid phase with increasing temperature. This is accompanied by an
increase in the interphase surface area due to spreading of liquid phase over the surface of the refractory particles.
Increase of the interphase area, in turn, accelerates the diffusional interaction between components by decreasing the
path lengths for volume diffusion and, correspondingly, accelerates mass transport through the liquid phase. The latter
is connected with recrystallization, which leads to more noticeable volume effects [10, 11].