Journal
MATERIALS LETTERS
Volume 229, Issue -, Pages 377-380Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.07.064
Keywords
Electron microscopy; Metals and alloys; Pulsed electron beam; Multilayer structure
Funding
- Ministry of Education and Science of the Russian Federation [2017/113, 3.1283.2017/4.6]
- Russian Foundation for Basic Research [16-58-00075 Bel_a]
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Using up-to-date methods of material studies, it is revealed that the structure of as cast Al-Si alloy (silumin) is multi-phased and morphologically heterogeneous. It consists of solid solution grains and eutectic Al-Si with a diverse morphology. With the help of selective etching intermetallic compounds (AlNiCu and AlMg) are detected on the grain boundaries of alpha-solid solution. Treatment of silumin samples by the intense pulsed electron beam with the diverse density results in release of the second phase sub-micro and nano-dimensional particles. According to experiments optimal energy densities of the electron beam are 25, 30 and 35 J/sm(2). Silumin irradiation results in a manyfold advance of mechanical and tribological properties of the surface layers. As found out, these characteristics of the surface layers change significantly due to the sub-micro and nano-dimensional structure of cellular crystallization formed by the electron beam, which is free of primary inclusions consisting of silicon and intermetallic compounds. (C) 2018 Elsevier B.V. All rights reserved.
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