Abstract

Evolution of structure of two-phase sintered Al-Sn composites during equal channel angular pressing (ECAP) without rotation of the sample between the passes (route A) was studied. The macrostructure with alternating thin Al and Sn interlayers was formed in the flow plane of the samples under the ECAP processing. It was found that the law of the changes in the parameters of the structure of the composites can be described using the geometry of ECAP. The greatest changes in the macrostructural parameters and increase in the strength of the composites were observed during the first two passes. The consequence of the thinning of aluminum interlayers is an increase in the depth of deformation of the subsurface layer and decrease in distance between tin interlayers which are sources of solid lubricant. As a result, the wear intensity of the sintered Al-Sn composites is additionally decreased under dry friction against steel if the sliding direction is perpendicular to the elongated phases interlayers. It was established that the composite containing about 40% Sn has the highest wear resistance.

中文翻译：

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等通道角挤压对烧结Al-Sn复合材料力学和摩擦学性能的影响

摘要

研究了等通道角挤压（ECAP）过程中两相烧结Al-Sn复合材料的结构在两次通过之间（路线A）没有旋转的情况下的演变。在ECAP处理下，在样品的流动平面上形成了Al和Sn中间层交替薄的宏观结构。已经发现，可以使用ECAP的几何形状描述复合材料的结构参数的变化规律。在前两次通过过程中，观察到宏观结构参数的最大变化和复合材料强度的增加。铝中间层变薄的结果是增加了地下层的变形深度并减小了作为固体润滑剂来源的锡中间层之间的距离。结果是，如果滑动方向垂直于长相夹层，则在与钢的干摩擦下烧结的Al-Sn复合材料的磨损强度会进一步降低。已经确定，包含约40％Sn的复合材料具有最高的耐磨性。