Abstract
Differential barothermal analysis (DBA) is used to analyze the effect of hydrostatic pressure of 100 MPa on characteristic temperatures of a number of eutectic alloys (wt %), such as Al–10Si, Al–12Si, Al‒22Cu, Al–33Cu, and Al–7Cu–7Si. According to DBA data, the increase in pressure resulted in an increase in the temperatures of phase transformation; in practice, the most important of them is the nonvariant eutectic transformation temperature that determines the solidus of alloys. It was found that, for the binary systems, the temperatures of the nonvariant eutectic transformation L → (Al) + Si and L → (Al) + Al2Cu increase by 6 and 11°С (from 577 to 583°С and from 548 to 559°С, respectively); for the ternary system, the temperature of transformation L → (Al) +Al2Cu + Si increases by 6°С (from 520 to 526°С). Theoretical analysis, performed using thermodynamic models and Thermo-Calc software, shows that the increase in the eutectic transformation temperature with increasing pressure is directly dependent on the relative decrease in the molar volume of system upon associated eutectic transformation. In this case, the excess dissolution of silicon in (Al) under high pressure can lead to an additional decrease in the molar volume of the system, whereas the increase in the copper solubility is thermodynamically unfavorable.
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REFERENCES
M. A. Islam and Z. N. Farhat, “The influence of porosity and hot isostatic pressing treatment on wear characteristics of cast and P/M aluminum alloys,” Wear 271, 1594–1601 (2011).
L. Ceschini, A. Morri, and G. Sambogna, “The effect of hot isostatic pressing on the fatigue behavior of sand-cast A356-T6 and A204-T6 aluminum alloys,” J. Mater. Process. Technol. 204, 231–238 (2008).
P. Petrov, S. Konstantinova, G. Buchvarov, and I. Petrov, “Hot isostatic pressing treatment of AlSi7Mg aluminium alloy,” J. Mater. Sci. Technol., No. 2, 26–33 (1994).
I. Fujishiro, H. Mii, M. Senoo, and M. Akao, “High pressure phase diagram of Al–Si system,” J. Soc. Mater. Sci., Jpn. 20, 952–955 (1971).
H. Mii, M. Senoo, and I. Fujishiro, “Solid solubility of Si in Al under high pressure,” Jpn. J. Appl. Phys. 15, 777–783 (1976).
T. K. Akopyan, A. G. Padalko, N. A. Belov, G. C. Zlobin, and V. A. Baklan, “Influence of enhhanced pressure on the temperatures of phase transformations in high-strength casting aluminum alloys of the Al–Zn–Mg–(Cu)–Ni–Fe system,” Tsvetn. Metally No. 7, 81–87 (2013).
A. G. Padalko, A. N. Veselov, S. P. Avduhin, G. D. Nipan, and V. P. Sanygin, “Differential barothermal analysis (DBA) of Ni-base alloys,” J. Therm. Anal. Calorim. 72, 791–799 (2003).
N. A. Belov and V. S. Zolotorevskii, “Casting alloys based on aluminum–nickel eutectics (nikalins) as a possible alternative to silumines,”Tsvetn. Metally, No. 2, 99–105 (2003).
N. A. Belov and V. S. Zolotorevskij, “The effect of nickel on the structure, mechanical and casting properties of aluminium alloy of 7075 type,” Mater. Sci. Forum 396–402, 935–940 (2003).
E. Yu. Tonkov, Phase Transformations in Compounds under High Pressure (Metallurgiya, Moscow, 1988), Vol. 1 [in Russian].
A. G. Padalko, A. N. Veselov, S. P. Avduhin, G. D. Nipan, and V. P. Sanygin, “Pressure effect on the phase transitions in Ni-base multicomponent systems,” J. Therm. Anal. Calorim. 80, 599–606 (2005).
L. F. Mondolfo, Aluminum Alloys: Structure and Properties (Butterworths, London, 1976).
I. J. Polmear, Light Metals: From Traditional Alloys to Nanocrystals, 4th ed. (Elsevier, Amsderdam, 2005).
A. G. Padalko, N. A. Belov, A. N. Veselov, and G. V. Talanova, “Thermography of the phase transformations in a hypoeutectic Al–7% Si–0.5% Mg silumin at high pressures and temperatures,” Russian Metallurgy Metally), 2009, No. 1, 65–69 (2009).
Z. Li, A. M. Samuel, F. H. Samuel, C. Ravindran, and S. Valtierra, “Effect of alloying elements on the segregation and dissolution of CuAl2 phase in Al–Si–Cu 319 alloys,” J. Mater. Sci. 38, 1203–1218 (2003).
E. Sjolander and S. Seifeddine, “The heat treatment of Al–Si–Cu–Mg casting alloys,” J. Mater. Process. Technol. 210, 1249–1259 (2010).
S. G. Shabestari and F. Shahri, “Influence of modification, solidification conditions and heat treatment on the microstructure and mechanical properties of A356 aluminum alloy,” J. Mater. Sci. 39, 2023–2032 (2004).
Cui-Yun He, Yong Du, Hai-Lin Chen, Honghui Hu, Experimental investigation and thermodynamic modeling of the Al–Cu–Si system, Calhpad. 33, 200–210 (2009).
http://www.thermocalc.com/.
V. S. Zolotorevskiy, N. A. Belov, and M. V. Glazoff, Casting Aluminum Alloys (Elsevier, Amsderdam, 2007).
Funding
This study was supported by the Fundamental Research Program of the Presidium of the Russian Academy of Science (no. P37) and was performed in terms of task no. 11.2072.2017/4.6.
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Translated by N. Kolchugina
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Akopyan, T.K., Belov, N.A., Padalko, A.G. et al. Analysis of the Effect of Hydrostatic Pressure on the Nonvariant Eutectic Transformation in Al–Si, Al–Cu, and Al–Cu–Si Systems. Phys. Metals Metallogr. 120, 593–599 (2019). https://doi.org/10.1134/S0031918X19060024
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DOI: https://doi.org/10.1134/S0031918X19060024