Bridgman-type Solidification Apparatus Research Articles

Determination of thermal conductivity and interfacial energy of solid Zn solution in the Zn–Al–Bi eutectic system

The equilibrated grain boundary groove shapes for solid Zn solution (Zn–3.0 at.% Al–0.3 at.% Bi) in equilibrium with the Zn–Al–Bi eutectic liquid (Zn–12.7 at.% Al–1.6 at.% Bi) have been observed from quenched sample with a radial heat flow apparatus. Gibbs–Thomson coefficient, solid–liquid interfacial energy and grain boundary energy for solid Zn solution in equilibrium with Al–Bi–Zn eutectic liquid have been determined to be (5.1±0.4)×10−8Km, (80.1±9.6)×10−3 and (158.6±20.6)×10−3Jm−2 from the observed grain boundary groove shapes, respectively. The thermal conductivity variation with temperature for solid Zn solution has been measure with radial heat flow apparatus and the value of thermal conductivity for solid Zn solution has been determined to be 135.68W/km at the eutectic melting temperature. The thermal conductivity ratio of equilibrated eutectic liquid to solid Zn solution, R=KL(Zn)/KS(Zn) has also been measured to be 0.85 with Bridgman type solidification apparatus.

Determination of interfacial energies in the Al–Ag and Sn–Ag alloys by using Bridgman type solidification apparatus

The equilibrated grain boundary groove shapes in the Al–Ag and Sn–Ag eutectic systems for the first time were observed in a linear temperature gradient by using a Bridgman type directional solidification apparatus. Gibbs–Thomson coefficient, solid–liquid interfacial energy and grain boundary energy for solid ζ (Ag–42 at.% Al), solid Al solution (Al–23.8 at.% Ag) and solid Sn were determined from observed grain boundary groove shapes. The results obtained in present work have been compared with the experimental results obtained in previous works for similar solid phases in the binary and ternary alloys.