Experimental investigation of the phase equilibria of the Al–Ca–Zn system at 623 K

The Al–Ca–Zn phase diagram at 623 K was experimentally studied using diffusion couples and selected key alloys. Three new ternary compounds IM1 (with the composition range of Al30Ca8Zn62 to Al27Ca8Zn65), IM2 (with the composition range of Al25Ca25Zn50 to Al20Ca25Zn55) and IM3 (Al15Ca63Zn22) have been found in this system. In addition, the existence of two ternary compounds: C36 and Al2CaZn2 were confirmed. Their solubility at 623 K was found to be: C36 (from Al58Ca33Zn9 to Al43Ca33Zn24) and Al2CaZn2 (from Al55Ca20Zn25 to Al40Ca20Zn40). Ternary solubility of the binary compounds was determined. Based on the current results and experimental literature data, the isothermal section of the Al–Ca–Zn phase diagram at 623 K was constructed.

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► The isothermal section of the Al–Ca–Zn phase diagram at 623 K was constructed.
► The homogeneity ranges of the ternary and binary compounds were determined.
► Three new ternary compounds (IM1, IM2 and IM3) were found.
► The existence of two other ternary compounds (C36 and Al2CaZn2) was confirmed.