Evolution of the Structure of a Near-Surface Layer of an Aluminum Matrix Composite of the Al–Sn–Fe System under Dry Friction Against a Steel Counterbody

IF 0.5 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Friction and Wear Pub Date : 2023-09-25 DOI:10.3103/S106836662303008X

N. M. Rusin, A. L. Skorentsev, A. V. Chumaevskii

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Abstract—

An effect of friction forces on the structure and composition of the near-surface layer of an Al–13Sn–5Fe (at %) composite containing a large amount of agglomerates of FeAl₃ particles cemented with tin was studied. The investigated composite was prepared by sintering a mixture of Al, Sn, and Fe elemental powders in vacuum for 1 h at a temperature of 620°C and subsequent compaction in a closed die at a pressure of about 300 MPa and a temperature of 250°C. The counterbody was made of heat-resistant X40CrMoV5-1 steel and was a truncated steel cone with a helical surface. The speed of material points lying on the outer perimeter of the section of the rotating cone pressed against the composite was 0.36 and 0.54 m/s. The normal pressure on the end surface of the composite specimen was 16 and 32 MPa with a load on the cone of 150 and 300 kg, respectively. It was found that three layers are formed under the friction surface, which differ in the value of the accumulated deformation. The closer to the friction surface the layer is located, the narrower it is. The uppermost layer consists of highly crushed iron aluminide particles mixed with ultrafine tin and aluminum particles. It also contains a lot of oxygen in the form of fragments of oxide films, which is why it has a high microhardness, reaching 2000 MPa or more. The thickness of this layer increases with increasing processing pressure and reaches several hundred micrometers. Based on the results of the study, it is concluded that pretreatment of the surface of aluminum matrix composites by smoothing with a flat steel counterbody leads to its charging. This fact will increase its wear resistance, however, the optimal mode of such processing and the shape of the processing tool require additional research.

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Al–Sn–Fe系铝基复合材料在与钢制配重干摩擦下近表面层结构的演变

摘要——研究了摩擦力对Al–13Sn–5Fe（at%）复合材料近表面层结构和成分的影响，该复合材料含有大量与锡胶结的FeAl3颗粒团聚体。所研究的复合材料是通过在620°C的温度下将Al、Sn和Fe元素粉末的混合物在真空中烧结1小时，然后在约300 MPa的压力和250°C的压力下在闭合模具中压实而制备的。沉头体由耐热X40CrMoV5-1钢制成，是具有螺旋表面的截头钢锥。位于压在复合材料上的旋转锥体截面的外周上的材料点的速度分别为0.36和0.54m/s。复合材料试样端面上的法向压力分别为16和32MPa，锥体上的载荷分别为150和300kg。研究发现，摩擦表面下形成了三层，累积变形值不同。该层越靠近摩擦表面，就越窄。最上层由高度破碎的铁铝化物颗粒与超细锡和铝颗粒混合而成。它还以氧化膜碎片的形式含有大量氧气，这就是为什么它具有高显微硬度，达到2000兆帕或更高。该层的厚度随着处理压力的增加而增加，并且达到几百微米。根据研究结果，得出结论：用扁钢沉头对铝基复合材料表面进行光滑预处理，可使其带电。这一事实将增加其耐磨性，然而，这种加工的最佳模式和加工工具的形状需要额外的研究。

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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.