Microstructure and Coefficient of Friction of Silumins Obtained by Rapid Solidification

IF 0.5 4区工程技术 Q4 ENGINEERING, MECHANICAL Journal of Friction and Wear Pub Date : 2024-08-17 DOI:10.3103/s1068366624700107

O. V. Gusakova, V. G. Shepelevich

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Abstract—

The results of a study of the tribological properties and microstructure of rapidly solidified Al–12.2 wt % Si–0.2 wt % Fe (AK12vp) and Al–12.5 wt % Si–0.8 wt % Mg–0.4 wt % Mn–0.7 wt % Fe–0.9 wt % Ni—1.7 wt %, Cu (Al–Si–M) alloys are presented. The effect of multicomponent alloying on the microstructure of near-eutectic silumin was studied using scanning electron microscopy and X-ray spectrometry. Multicomponent alloying of the Al–Si eutectic alloy with magnesium, manganese, iron, nickel, and copper leads to a reduction in the size of the primary α-Al dendrites to 3–4 μm. Tribological tests carried out under conditions of dry friction with reciprocating motion of the indenter showed that alloying by metals of rapidly solidified eutectic silumin leads to a reduction in the coefficient of friction by 25%. An analysis of the surface state of the track showed that, as a result of deformation heating, the oxidation of the α-Al phase occurs, the destruction of the oxide film, which represents the third body, and its removal beyond the track. The fragmentation of silicon plates in the track area into nano-sized particles was also obtained. The impact of the indenter also leads to a uniform distribution of equiaxed particles of intermetallic compounds while maintaining their phase composition.

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快速凝固法获得的硅胶的微观结构和摩擦系数

摘要--本文介绍了对快速凝固的 Al-12.2 wt % Si-0.2 wt % Fe (AK12vp) 和 Al-12.5 wt % Si-0.8 wt % Mg-0.4 wt % Mn-0.7 wt % Fe-0.9 wt % Ni-1.7 wt %, Cu (Al-Si-M) 合金的摩擦学特性和微观结构的研究结果。使用扫描电子显微镜和 X 射线光谱法研究了多组分合金化对近共晶硅铝微观结构的影响。铝硅共晶合金与镁、锰、铁、镍和铜的多组分合金化导致原生α-Al枝晶的尺寸减小到3-4 μm。在压头往复运动的干摩擦条件下进行的摩擦学测试表明，快速凝固共晶硅铝的金属合金化可使摩擦系数降低 25%。对轨道表面状态的分析表明，由于变形加热，α-Al 相发生氧化，代表第三体的氧化膜被破坏，并脱落到轨道之外。此外，还发现轨道区域的硅片碎裂成纳米级颗粒。压头的冲击还导致金属间化合物等轴颗粒的均匀分布，同时保持了它们的相组成。

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来源期刊

Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

1.50

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.