The effect of melt treatment with water vapor on the microstructure and linear thermal expansion coefficient (LTEC) of Al–(20–40)% Si alloys is studied. LTEC values are determined in the temperature range of 50–450 °C. It is established that melt treatment with water vapor has not only a modifying effect on the structure of high-silicon silumins, but also affects the value and nature of the change in LTEC making it possible to reduce its values at test temperatures of 50–250 °C. The efficiency of melt treatment in a water vapor atmosphere depends on silicon content and decreases with the increase of its content in the alloy. A regime for alloy modification providing maintenance of water vapor at 1200 °C in the atmosphere for 1 hour may be used in the production of industrial alloys with low LTEC for objects of special instrument building.
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Translated from Metallurg, Vol. 63, No. 1, pp. 71–76, January, 2019.
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Afanas’ev, V.K., Popova, M.V., Dolgova, S.V. et al. Effect of Melt Treatment with Water Vapor on Thermal Expansion of Alloy Al – 20–40% Si. Metallurgist 63, 87–95 (2019). https://doi.org/10.1007/s11015-019-00797-9
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DOI: https://doi.org/10.1007/s11015-019-00797-9