OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 1 2024 Al3(ScHfZr) а b c d Fig. 1. Chemical composition of large intermetallic particles in specimens cast into a copper chill mold: a) 1590 Er0.03-Hf0.05; b) 1590 Er0.03-Hf0.16; c) 1590 Er0.16-Hf0.05; d) 1590 Er0.16-Hf0.16 Ta b l e 2 Chemical composition of coarse intermetallic particles Mg Al Sc Hf Zr Mn Si Zn Fe Ti Er Al8(FeMn) 4.48 74.32 0.12 0.61 0.2 8.11 0.1 0.37 10.54 0 0.06 Al12(FeMn) 7.06 83.93 0.18 0.3 0.21 3.25 0.58 0.32 3.95 0.02 0.15 MgSi2 23.39 60.95 0.08 0 0.1 0.13 14.88 0.42 0 0.06 0 Al3ScHf 6.36 72.82 5.78 6.86 6.13 0.47 0.39 0.17 0.02 0.08 0.19 reaction. These compounds cannot modify the structure. However, particles of the Al3Sc-, Al3Hf-, and Al3Zr-type, modifying the cast structure, were not found in these alloys. The alloy 1590 Er0.16-Hf0.16 with a maximum content of hafnium and erbium at 0.16 % contains Al3Sc-type intermetallic compounds. The presence of zirconium and hafnium is explained by the fact that it can dissolve in the Al3Sc phase up to 35 % and 36 %, respectively. These compounds are primary intermetallic ones, i.e. are formed directly in
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