Розробка та виплавка ливарних високоентропійних сплавів на основі системи Fe–Co–Ni–Mn–Cr

• Дата: 2023
• Автори: Щерецький, О. А., Сергієнко, Р. А., Верховлюк, А. М.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2023
• Теми: високоентропійні сплави; евтектичні сплави; ливарні сплави; хімічний склад; розкид вмісту елементів; твердий розчин заміщення
• Онлайн доступ: https://plit-periodical.org.ua/index.php/plit/article/view/development-and-smelting-casting-high-entropy-alloys-based-fecon
• Назва журналу: Casting Processes

Physico-Technological Institute of Metals and Alloys of the National Academy of Science of Ukraine (Kyiv, Ukraine) UDK 621.74:669.017.15 The literature review is carried out and the conditions for the formation of disordered substitutional solid solutions with body-centered cubic (BCC), face-centered cubic (FCC), BCC+FCC lattices and eutectic structure in high-entropy alloys (HEAs) are determined. The following parameters are responsible for the formation of a solid solution in HEAs: mixing entropy 13.4 < ΔSmix ≤ 22 J/mol K; mixing enthalpy – 12 < ΔHmix <3.2 kJ/mol; atomic radii differences 0 ≤ δ < 6.6 %; electronegativity difference Δχ ≤ 0.12; valence electron concentration VEC > 8 (FCC), VEC < 6.87 (BCC), 6.87 < VEC < 8 (BCC + FCC); thermodynamic parameter Ω > 1.1. A special induction vacuum furnace for smelting high-entropy alloys has been designed and developed. The tungsten heater was replaced by an inductor using a high-frequency KLN generator manufactured by the German company Leybold Heraeus GMBH, with a power of 6 kW, a frequency of 20-22 kHz, the maximum temperature of the melt did not exceed 1800 0C. Melting of alloys was performed in high-purity argon with an excess pressure of 15-20 kPa in an alumina crucible, which was placed into a graphite hearth. The optimal modes of melting HEAs have been established, which ensure the production of homogeneous castings: heating to a temperature of 1600 0C at a rate of 20-50 0C/min, holding in a liquid state for 30 minutes and cooling with a furnace. The measurement of the chemical composition of the alloy over the cross section of the ingot was carried out using a microprobe analyzer MS-46 of the French company CAMECA. 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