Calculations of the Isothermal Sections of the Phase Diagram of the Cd-Sn-Zn Ternary System at High Pressure
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摘要: 本文根据相图的边界理论和平衡体系中诸组元在各相中化学势相等的原理，计算了Cd-Sn-Zn三元共晶系的高压水平截面图。依据所得结果绘制出该三元系在一定温度下（500 K）不同压强时的固液平衡水平截面图，并绘制出液相面投影图。计算过程中对各组元的偏摩尔体积虽作了一些近似，但计算结果仍与文献值符合。从计算结果可知，对于该三元系来说，压强增加使体系液相区变窄。Abstract: According to the phase boundary theory the principle of the chemical potentials of each component in the different phases being equal in an equilibrium system, the horizontal sections and liquids projections of the phase diagram of Cd-Sn-Zn ternary system at constant temperature 500 K and different high pressures are calculated, and presented in figs. In this system, the form of liquids projection at a constant high pressure of 2.0 GPa is similar to that at normal pressure but the liquid regions of the former become smaller. Due to the effect of high pressure, the ternary eutectic temperature is increased by about 60 K.
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Key words:
- high pressure /
- phase diagram /
- horizontal section /
- Cd-Sn-Zn
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