A remarkable enhancement of mechanical and wear properties by creating a dual-scale structure in an Al-Sn-Si alloy
A remarkable enhancement of mechanical and wear properties by creating a dual-scale structure in an Al-Sn-Si alloy
复制标题
通过在 Al-Sn-Si 合金中创建双尺度结构，显着提高机械和磨损性能
DOI：
10.1016/j.surfcoat.2017.07.030
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发表时间：
2017-09-25
影响因子：
5.4
通讯作者：
Zeng, M. Q.
中科院分区：
文献类型：
--
作者：
Song, K. Q.;Lu, Z. C.;Zeng, M. Q.
通过机械合金化（MA）生产的纳米复合铝锡基轴承合金具有高硬度；然而，它们较差的烧结密度和延展性限制了其广泛应用。在这里，我们提出了一种策略，通过传统粉末烧结和热机械处理相结合，在由粗晶粒和超细晶粒组成的 Al-Sn-Si 合金中产生双尺度结构。我们发现样品的严重变形和 Al-Si 共晶混合物的存在会引起 Al 的异常晶粒生长，从而通过退火处理产生双尺度 Al-Sn-Si 合金。在500和550℃的退火温度下实现了延展性和强度的最佳匹配以及最佳的磨损性能。对磨损机制的详细研究表明，双尺度结构提供的高强度和高延展性的结合是提高磨损性能的关键因素。 (C) 2017 Elsevier B.V. 保留所有权利。
Nanocomposite Al-Sn-based bearing alloys produced by mechanical alloying (MA) exhibit high hardness; however, their poor sintering density and ductility limit their wide spread application. Here, we present a strategy to produce a dual-scale structure in an Al-Sn-Si alloy consisting of coarse and ultrafine grains through a combination of conventional powder sintering and thermomechanical treatment. We found that severe deformation and the presence of an Al-Si eutectic mixture for sample induced abnormal grain growth of Al to create the dual-scale Al-Sn-Si alloy through annealing treatment. An optimum matching of ductility and strength, and optimum wear performance were achieved at annealing temperatures of 500 and 550 degrees C. Detailed investigation of the wear mechanism revealed that the combination of high strength and high ductility provided by the dual-scale structure is a key factor for the improvement of the wear properties. (C) 2017 Elsevier B.V. All rights reserved.