Relationship between the residual electric resistance of solid solutions and the rate of their melting in contact with metals

Influence of Nickel Content on the Formation of an Interaction Zone during Contact Melting of Titanium with Copper-Nickel Alloys

“…Changing the region of the eutectic structure formation and its phase composition allowed us to conclude that the CM process was ongoing according to a mechanism similar to that described in [22,24]. In accordance with [22,24], an increase in the nickel content in β-Ti to a certain critical concentration led to the "blocking" of its individual small regions by "partitions" of nickel atoms and the formation of nano-sized volumes (clusters) on which size effect of melting was realized [21]. According to [21], the chaotically distributed clusters subsequently merged upon contact with each other, forming a liquid matrix with individual solid β-Ti particles (microcrystals).…”

“…The solid particles surrounded by the liquid dissolve, and the entire region of the solid solution turns into a thin film of liquid. Since it is energetically beneficial for the system to form a liquid phase at the lowest temperature of its stable existence, the temperature of the thin liquid film should quickly decrease, and the In accordance with [22,24], an increase in the nickel content in β-Ti to a certain critical concentration led to the "blocking" of its individual small regions by "partitions" of nickel atoms and the formation of nano-sized volumes (clusters) on which size effect of melting was realized [21]. According to [21], the chaotically distributed clusters subsequently merged upon contact with each other, forming a liquid matrix with individual solid β-Ti particles (microcrystals).…”

“…There are many known methods for producing Ti-Cu coatings: pack cementation [14,15], self-propagating high-temperature synthesis [16], laser processing [17], electrolytic deposition [18], and electric spark alloying [19,20]. The most promising method is one that includes explosive welding followed by heat treatment via contact melting (CM) [21][22][23][24]. Explosive welding makes it possible to obtain plastic metal composites of various dimensions, which can be subjected to pressure treatment in order to give semi-finished products the required shape and size.…”

“…As is known [21,25], contact melting is a phenomenon in which two solid metals in contact begin to melt at temperatures below their melting points. A necessary condition for CM is the presence of a minimum in the phase diagram of the contacted crystals.…”

“…The doping of a binary system can lead to a change in CM temperature, as well as the formation of a different phase composition of IZ. It is known [21] that doping of binary systems can lead to both an increase and a decrease in the contact melting temperature. In the first case, this may be due to a decrease in the diffusion mobility of atoms, and in the second, due to the formation of new phases and ternary eutectics.…”