Estimation of Maximum Solid Solubility in Mg–Hg Alloys by the Lever Rule

Abstract

The microstructures of MgHg alloys with 1.12.9 mass% Hg were investigated in this paper. Under the non-equilibrium solidification condition, the examined MgHg alloys had a two-phase structure consisting of a solid solution phase and a spheroidal-graphite iron-like divorced eutectic. Eutectic ¡-Mg and eutectic Mg 3 Hg formed separately, so the proportion of eutectic Mg 3 Hg could be accurately measured. A method was proposed to estimate the maximum solid solubility of Hg in Mg under the non-equilibrium solidification condition by measuring the area fraction of Mg 3 Hg in metallographes. The maximum solid solubility of Mg2.4 mass% Hg was 0.81 and 0.69 mass%, with cooling rates of 0.67 and 2.0 K/s, respectively. The maximum solid solubility decreased as the cooling rate increased and increased as the Hg content increased.

Crystallographic effect of a high magnetic field on a solidified hypoeutectic Zn–Al alloy

“…The area fractions of the primary dendrites were analysed by the Image-Pro Plus software (Wang et al, 2013). The easy magnetization direction of the primary dendrites is determined as follows: first the FD vector in the sample coordinate system is transformed to its equivalent vector in the crystal coordinate system with the measured orientation data of the crystals; then a plane is defined by the cross product of these two differently oriented vectors ; finally the statistically representative crystalline direction close to the normal vector of the plane is determined as the easy magnetization direction.…”