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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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Published in: | Russian metallurgy Metally 2019-04, Vol.2019 (4), p.398-402 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0036-0295 1555-6255 1531-8648 |
DOI: | 10.1134/S0036029519040189 |