Abstract
The growth of the liquid interlayer in the system lead-tin at 463 K is studied experimentally in the nonstationary diffusion process of contact melting. The contact melting was carried out between pure tin and solid solution of tin in lead (0, 5.9, 11.5, 17.8, 24.8 mol. % Sn). The results indicate that the concentration range of the liquid interlayer corresponds to the interval of homogeneity of the liquid phase in the phase diagram at the experiments temperature. It is shown that the solid solution corresponding to the solidus near the liquid/crystal interface can not be generated by the diffusion of atoms from the liquid into the crystal. An explanation is offered that the solid solution of solidus composition at the liquid/crystal interface occurs as a result of the precipitate from the metastable (supersaturated by lead) melt.
Highlights
Contact melting is melting of the crystal as a result of exposure to the surface of another adjacent phase – an extrinsic crystal, liquid or vapor [1]
At the first stage of calculations we obtained diffusion coefficient for tin-lead melts at 463 K. We used for this the contact melting results between the α solid solution with 24.8% tin and with pure tin
Because of this solid solution is close to the composition of a solid solution maximum possible at the experiment temperature, i.e. to solidus composition of the lead-side, it is natural to assume that in this case the liquidus concentration at the interface with the α-phase is ensured by force
Summary
Contact melting is melting of the crystal as a result of exposure to the surface of another adjacent phase – an extrinsic crystal, liquid or vapor [1]. In this paper we carried out contact melting in the nonstationary diffusion process. This process occurs if samples A and B are fixed and arranged vertically and a denser material is located at the bottom [2]2. In this case in the contact zone the isoconcentration planes move in accordance with the parabolic law [2, 3]: z(nk ,t) (nk ) t , (1). In the expression (1) it is taken into account that the diffusion process between the two samples, each of which is homogeneous, begins at time t=0 in the plane z=0
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