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Structural-Phase State and the Properties of Silumin after Electron-Beam Surface Treatment

—Modern materials-science techniques are used to analyze the gradient structural-phase states and the nanohardness of hypereutectic silumin after high-current electron-beam melting of the surface layer. Electron-beam treatment is shown to dissolve silicon inclusions and intermetallic compounds obser...

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Bibliographic Details
Published in:Russian metallurgy Metally 2019-04, Vol.2019 (4), p.398-402
Main Authors: Ivanov, Yu. F., Gromov, V. E., Konovalov, S. V., Zagulyaev, D. V., Petrikova, E. A.
Format: Article
Language:English
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Summary:—Modern materials-science techniques are used to analyze the gradient structural-phase states and the nanohardness of hypereutectic silumin after high-current electron-beam melting of the surface layer. Electron-beam treatment is shown to dissolve silicon inclusions and intermetallic compounds observed in the initial state and form an aluminum cellular high-rate solidification structure and lamella eutectic grains. The content of alloying elements decreases by a factor of 1.5–2. The hardness of the irradiated silumin is found to change nonmonotonically and achieves its maximum at a distance of 30–50 μm from the surface. The maximum value is four times higher than the hardness of the unirradiated material. The radiation-induced changes in the silumin structure and hardness are explained.
ISSN:0036-0295
1555-6255
1531-8648
DOI:10.1134/S0036029519040189