Solid-liquid interfacial energy of the eutectoid beta phase in the Al-Zn eutectic system

The equilibrated grain boundary groove shapes for the solid beta phase in Al-Zn liquid solutions were observed on quenched samples. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficient for solid beta (Al-84 wt.% Zn) in Al-Zn liquid solutions has been determined to be (3.41 +/- 0.14) x 10(-8) Km with a numerical method. The solid-liquid interfacial energy between solid beta and Al-Zn liquid solution has been obtained to be (106.94 +/- 9.62) X 10(-3) J m(-2) from the Gibbs-Thomson equation. The grain boundary energy for the same material has been calculated to be (204.72 +/- 22.52) X 10(-3) J m(-2) from the observed grain boundary groove shapes. The thermal conductivities of the solid and liquid phases for Al-95 wt.% Zn and Al-84 wt.% Zn systems have also been measured. (C) 2003 Elsevier B.V. All rights reserved

Temperature dependency of thermal conductivity of solid phases for fatty acids; lauric, myrsistic, pivalic and stearic acids

Thermal conductivity variations with tempera ture of solid phases for lauric acid (LA), myristic acid (MA), pivalic acid (PA), and stearic acid (SA) have been measured with radial heat-flow method. Temperature dependencies of the thermal conductivity for same organic materials have been obtained by linear regression analysis. From graphs of thermal conductivity versus temperature, the thermal conductivity of solid phase at their melting temperature and temperature coefficients of thermal con ductivity for LA, MA, PA, and SA have been found to be 0.37, 0.39, 0.23, and 0.35 W K-1 m-1 and 0.00935, 0.00446, 0.01095, and 0.00295 K-1 , respectively. The ratios of thermal conductivity of liquid phase to thermal conductivity of solid phase for LA, MA, PA, and SA have also been measured to be 0.52, 0.48, 0.25, and 0.59, respectively, with a Bridgman-type directional solidifica tion apparatus

The measurement of thermal conductivity variation with temperature for Sn−20 wt.% In based lead−free ternary solders

The variations of thermal conductivity with temperature for Sn–In based lead-free solders, Sn-20 wt.% In-15 wt.% [X] (X=Ag, Bi, Sb, Zn) were measured by using the linear heat flow apparatus. The thermal conductivities of lead free solders at their melting temperatures were obtained from graphs of ther mal conductivity variations with temperature. The thermal temperature coefficients for Sn-20 wt.% In based lead free ternary solders were obtained from the graphs of thermal conductivity variations with temperature

Measurement of solid-liquid interfacial energy for solid Zn in equilibrium with the ZnMg eutectic liquid

The equilibrated grain boundary groove shapes for solid Zn in equilibrium with the ZnMg eutectic liquid were observed on rapidly quenched samples. The Gibbs-Thomson coefficient for the solid Zn has been determined to be (10.64 +/- 0.43) x 10(-8) K m from the observed grain boundary groove shapes with the present numerical model, and the solid-liquid interfacial energy for the solid Zn in equilibrium with the ZnMg eutectic liquid has been obtained to be (89.16 +/- 8.02) x 10(-3) J m(-2) from the Gibbs-Thomson equation. The grain boundary energy for the solid Zn has also been calculated to be (172.97 +/- 20.76) x 10(-3) J m(-2) from the observed grain boundary groove shapes

Solid-liquid interfacial energy of the solid Mg2Zn11 phase in equilibrium with Zn-Mg eutectic liquid

The Gibbs-Thomson coefficient and solid-liquid interfacial energy of the solid Mg2Zn11 phase in equilibrium with Zn-Mg eutectic liquid have been determined to be (3.3 +/- 0.2) x 10(-8) K mand (20.8 +/- 2.1) x 10(-3) J m(-2) from the equilibrated grain boundary groove shapes with a numerical model. The grain boundary energy of the solid Mg2Zn11 phase has been calculated to be (40.9 +/- 4.5) x 10(-3) J m(-2) by considering a force balance at the grain boundary grooves. The thermal conductivity ratio of the eutectic Zn-Mg liquid phase to the solid Mg2Zn11 phase has also been found to be 0.81

Solid-liquid interfacial energy of dichlorobenzene

Commercial- purity dichlorobenzene was purified using a columnar distillation system. The equilibrated grain boundary groove shapes for purified dichlorobenzene ( DCB) were directly observed by using a temperature gradient stage. From the observed grain boundary groove shapes, the Gibbs - Thomson coefficient and solid - liquid interfacial energy of purified DCB were determined to be ( 6.2 +/- 0.6) x 10(-8) K m and ( 29.3 +/- 4.4) x 10(-3) J m(-2) with the present numerical model and the Gibbs - Thomson equation, respectively. The grain boundary energy of the DCB phase was determined to be ( 54.1 +/- 9.2) x 10(-3) J m(-2) from the observed grain boundary grooves. The thermal conductivity ratio of the liquid phase to the solid phase was measured to be 0.94