Abstract
Phase relations of the AlZn system at various pressures up to 7.3 GPa are investigated by means of isobaric measurement of electrical resistance and X-ray diffraction analysis. The liquidus, solidus, eutectic and eutectoid horizontals and the f.c.c. miscibility gap in the equilibrium phase diagram move toward higher temperature with increasing pressure. The solubility of zinc in the α 1 phase (f.c.c. solid solution on the Al-rich side) and aluminum in the β phase (primary solid solution of Zn) tends to decrease under high pressures. However, the compositions of the eutectic and eutectoid points are invariable. The existence of the α 2 phase (f.c.c. solid solution on the Zn-rich side) is confirmed at a pressure of 7.3 GPa by means of in situ high-pressure X-ray diffraction. An isobaric temperature-composition section of the three-dimensional phase diagram of the AlZn system at a pressure of 5.4 GPa is constructed on the basis of the results.
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