Influence of Overheating and Cooling Rate on the Structure and Physicochemical Properties of Al-Cu Alloys

Abstract:

The effect of overheating of the melt and cooling rate of alloys of the Al-Cu system with a copper content of 25.0 – 36.0% ( mass.), the rest of the aluminum is investigated. It is shown that an overheating of the liquid at 50 – 100 K above the liquid-liquid line leads to the formation of a fine-dispersed eutectic structure and the inhibition of the formation of primary aluminum crystals in the pre-evacuation of alloys and the Al₂Cu phase in hypereuvtectic alloys, in accordance. An increase in the melt overheating temperature by 150 K above the liquid-liquid line and the subsequent cooling at 10³ – 10⁴ K/s leads to the complete inhibition of the formation of primary crystals. An overheating of the melt on 100 – 150 K alloys above the liquid line and subsequent cooling with a velocity of 10³ – 10⁴ K /s reduces the rate of corrosion by 30 – 45% and increases the numerical value in 1.3 – 1.45 times the relative wear resistance, and the brittleness of alloys decreases in 1.2 – 1.35 times in comparison with the samples after casting.

• Periodical: Solid State Phenomena (Volume 291)
• Pages: 42-51
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.291.42
• Online since: May 2019
• Authors: Nataliia Filonenko*, Oleksandr Babachenko, Ludmila Bartashevska, Ganna Kononenko, Nikita Ivanov
• Keywords: Al₂Cu Phase, Al-Cu Alloy, Eutectic, Melt, Overheating of the Alloy above the Liquidus Line

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