Abstract
We describe barothermal processing (hot isostatic pressing) of a 16 at % Si–Al binary alloy for 3 h at a temperature of 560°C and pressure of 100 MPa for 3 h, in combination with measurements of heat effects during cooling. The results demonstrate that this processing leads to the fragmentation of the silicon structural constituent and ensures a high degree of homogenization of the as-prepared alloy. Heat treatment of the 16 at % Si–Al alloy at 560°C and a pressure of 100 MPa leads to a thermodynamically driven enhanced silicon dissolution, up to ~10 at %, in the aluminum matrix, resulting in the formation of a supersaturated solid solution, which subsequently decomposes during cooling. We analyze the complete porosity elimination process, which makes it possible to obtain a material with 100% relative density. According to differential barothermal analysis, microstructural analysis, and scanning and transmission electron microscopy data, barothermal processing of the 16 at % Si–Al alloy produces a bimodal size distribution of the silicon phase constituent: microparticles 3.6 μm in average size and nanoparticles down to ~1 nm in diameter. The Al matrix has been shown to contain a high density of edge dislocations. Barothermal processing reduces the thermal expansion coefficient and microhardness of the hypereutectic alloy. We conclude that solid-state barothermal processing is an effective tool for completely eliminating microporosity from the 16 at % Si–Al alloy, reaching a high degree of homogenization, and controlling the microstructure of the alloy, in particular by producing high dislocation density in the aluminum matrix.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Murray, J.L. and McAlister, A.J., The Al–Si (aluminum–silicon) system, Bull. Alloy Phase Diagrams, 1984, vol. 5, pp. 74–84.
Hansen, M. and Anderko, K., Constitution of Binary Alloys, New York: McGraw-Hill, 1958, 2nd ed., vols. 1–2.
Diagrammy sostoyaniya dvoinykh metallicheskikh sistem (Phase Diagrams of Binary Metallic Systems), 3 vols., Lyakishev, N.P., Ed., Moscow: Mashinostroenie, 1996, 1997, 2001.
Aluminum and Its Alloys. Effect of Silicon on Silumins. http://cdn-as3.myvirtualpaper.com/s/soedinitel/aliegosplavy/ 2011053101/upload/aliegosplavy.pdf.
Ceschini, L., Morri, A., and Sambogna, G., The effect of hot isostatic pressing on the fatigue behavior of sandcast A356-T6 and A204-T6 aluminum alloys, J. Mater. Process. Technol., 2008, vol. 204, pp. 231–238.
Chama, C.C., Distribution of Al 332 12Fe3Si and (FeAl6)Si in a hiped Al–10.71 wt% Si casting, Mater. Character., 1996, vol. 37, no. 4, pp. 177–181.
Bouvard, D. and Ouedraogo, E., Modeling of hot isostatic pressing: a new formulation using random variables, Acta Metall., 1987, vol. 35, no. 7, pp. 2323–2328.
Li, E.K.H. and Funkenbusch, P.D., Modeling of the densification rates of monosized and bimodal-sized particle systems during hot isostatic pressing (HIP), Acta Metall., 1989, vol. 37, no. 6, pp. 1645–1655.
Nair, S.V. and Tien, J.K., Densification mechanism map for hot isostatic pressing (HIP) of unequal sized particles, Metall. Trans. A, 1987, vol. 18, pp. 97–107.
Li, W.-B., Ashby, M.F., and Easterling, K.E., On densification and shape change during hot isostatic pressing, Acta Metall., 1987, vol. 35, no. 12, pp. 2831–2842.
Wadley, H.N.G., Schaefer, R.J., Kahn, A.H., Ashby, M.F., Clough, R.B., Geffen, Y., and Wlassich, J.J., Sensing and modeling of the hot isostatic pressing of copper pressing, Acta Metall. Mater., 1991, vol. 39, no. 5, pp. 979–986.
Shrinivasan, R. and Weiss, I., Formation of surface depressions during hot isostatic pressing (HIP), Scr. Metall. Mater., 1990, vol. 24, pp. 2413–2418.
Zulfia, A., Atkinson, H.V., Jones, H., and King, S., Effect of hot isostatic pressing on cast A357 aluminum alloy with and without SiC particle reinforcement, J. Mater. Sci., 1999, vol. 34, pp. 4305–4310.
Saltykov, S.A., Stereometricheskaya metallografiya (Stereometric Metallography), Moscow: Metallurgiya, 1976.
Dedyaeva, E.V., Akopyan, T.K., Padalko, A.G., and Fedotov, V.T., Barothermal analysis of the phase transformations and structure of Al–16 at % Si hypereutectic alloy, Izv. Vyssh. Uchebn. Zaved., Tsvetn. Met., 2014, no. 7, pp. 76–79.
Schumacher, P., Reich, M., Mohles, V., Pogatscher, S., Uggowitzer, P.J., and Milkereit, B., Correlation between supersaturation of solid solution and mechanical behaviour of two binary Al–Si alloys, Mater. Sci. Forum, 2014, vols. 794–796, pp. 508–514.
Fujikava, S.-I., Hirano, K.-I., and Fukushima, Y., Diffusion of silicon in aluminum, Metall. Trans. A, 1978, vol. 9, pp. 1811–1815.
Beresnev, A.G., Razumovskii, I.M., Marinin, S.F., Tikhonov, A.A., and Butrim, V.N., Technological principles underlying the hot isostatic pressing of monocrystalline blades from high-temperature nickel alloys for aero engines, Tsvetn. Met., 2011, no. 12, pp. 84–88.
Dedyaeva, E.V., Nikiforov, P.N., Padalko, A.G., Talanova, G.V., and Shvorneva, L.I., Effect of barothermal processing on the microstructure and properties of Al–10 at % Si hypoeutectic binary alloy, Inorg. Mater., 2016, vol. 52, no. 7, pp. 721–728.
Mii, H., Senoo, M., and Fujishiro, I., Solid solubility of Si in Al under high pressure, Jpn. J. Appl. Phys., 1976, vol. 15, pp. 777–783.
Belov, N.A., Fazovyi sostav promyshlennykh i perspektivnykh alyuminievykh splavov (Phase Composition of Commercially Available and Promising Aluminum Alloys), Moscow: Izd. Dom Mosk. Inst. Stali i Splavov, 2010.
Shamsuzzoha, M. and Hogan, L.M., The twinned growth of silicon in chill-modified Al–Si eutectic, J. Cryst. Growth, 1987, vol. 82, pp. 598–610.
Mortsell, E., Andersen, S., Marioara, C., Royset, J., Friis, J., and Holmestad, R., Characterization of multicomponent Al alloys by TEM, HAADF-STEM, EELS, Proc. 16th Eur. Microscopy Congr., Lyon, 2016, pp. 209–210.
Physical Metallurgy, Cahn, R.W., Ed., Amsterdam: North-Holland, 1965.
Zhilyaev, A.P., Gálvez, F., Sharafutdinov, A., and Pérez-Prado, M.T., Influence of the high pressure torsion die geometry on the allotropic phase transformations in pure Zr, Mater. Sci. Eng., A, 2010, vol. 527, pp. 3918–3928.
Hidnert, P. and Krider, H.S., Thermal expansion of aluminum and some aluminum alloys, J. Res. Natl. Bur. Stand., 1952, vol. 48, no. 3, pp. 209–220.
Prigunova, A.G., Belov, N.A., Taran, Yu.N., Zolotorevskii, V.S., Napalkov, V.I., and Petrov, S.S., Siluminy. Atlas mikrostruktur i fraktogramm promyshlennykh splavov (Silumins: Atlas of Microstructures and Fracture Surface Maps for Industrial Alloys), Moscow: Mosk. Inst. Stali i Splavov, 1996.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © E.V. Dedyaeva, D.V. Zaitsev, E.A. Lukina, P.N. Nikiforov, A.G. Padalko, G.V. Talanova, K.A. Solntsev, 2018, published in Neorganicheskie Materialy, 2018, Vol. 54, No. 2, pp. 138–145.
Rights and permissions
About this article
Cite this article
Dedyaeva, E.V., Zaitsev, D.V., Lukina, E.A. et al. Effect of Barothermal Processing on the Solid-State Formation of the Structure and Properties of 16 at % Si–Al Hypereutectic Alloy. Inorg Mater 54, 125–132 (2018). https://doi.org/10.1134/S0020168518020024
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0020168518020024