Evolution of the Surface Layer of the Al–15% Si–Y2O3 System after Combined Treatment

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING
Yu. A. Shlyarova, V. V. Shlyarov, I. A. Panchenko, Yu. F. Ivanov, D. V. Zagulyaev, A. N. Prudnikov
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引用次数: 0

Abstract—Al–Si alloys are indispensable in various industries, such as aerospace and automotive ones, due to their high strength-to-weight ratio, high thermal conductivity, and corrosion resistance. These alloys often contain elements such as Si, Cu, Mg, and Zr, which improve their properties, and special compositions make it possible to increase strength and wear resistance and to improve a granular structure. The paper describes a combined modification of the surface layer of a hypereutectic Al–15% Si alloy, which consists in electroexplosive alloying by the Al–Y2O3 system followed by irradiation with a pulsed electron beam. Combined treatment is found to cause a multiple (by ~7.6 times) increase in the wear resistance of the modified silumin layer. The modified 35-μm-thick sample volume has a multilayer multielement multiphase structure and is reinforced with oxide nanoparticles. Pulsed electron beam irradiation of the surface of the silumin subjected to electroexplosive alloying is found not to bring about dissolution of an yttrium oxide powder: regions enriched in yttrium atoms are present at the sample surface. The revealed multiple increase in the wear resistance of the silumin subjected to combined treatment is thought to be caused by the formation of oxide nanoparticles in the surface layer.

Abstract Image

复合处理后Al-15% Si-Y2O3体系表面层的演变
摘要al - si合金因其高强度重量比、高导热性和耐腐蚀性,在航空航天和汽车等各个行业中都是必不可少的。这些合金通常含有诸如Si、Cu、Mg和Zr等元素,这些元素可以改善其性能,特殊成分可以提高强度和耐磨性,并改善颗粒结构。本文介绍了用Al-Y2O3体系结合脉冲电子束辐照对电爆炸合金化过共晶Al-15% Si合金表层进行复合改性的方法。复合处理可使改性硅树脂层的耐磨性提高数倍(约7.6倍)。改性后的样品体积为35 μm厚,具有多层多元素多相结构,并被氧化物纳米颗粒增强。用脉冲电子束照射经电爆炸合金化的硅明表面,发现不会使氧化钇粉末溶解,而是在样品表面存在富集钇原子的区域。复合处理后的硅明耐磨性有了成倍的提高,这可能是由于在表层形成了氧化纳米颗粒。
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来源期刊
Russian Metallurgy (Metally)
Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
0.70
自引率
25.00%
发文量
140
期刊介绍: Russian Metallurgy (Metally)  publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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