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A study on tribological behaviour and analysis of ZnO reinforced AA6061 matrix composites fabricated by stir casting route
Industrial Lubrication and Tribology ( IF 1.6 ) Pub Date : 2021-05-17 , DOI: 10.1108/ilt-11-2020-0392
Sakthi Sadhasivam RM , Ramanathan K. , Bhuvaneswari B.V. , Raja R.

Purpose

The most promising replacements for the industrial applications are particle reinforced metal matrix composites because of their good and combined mechanical properties. Currently, the need of matrix materials for industrial applications is widely satisfied by aluminium alloys. The purpose of this paper is to evaluate the tribological behaviour of the zinc oxide (ZnO) particles reinforced AA6061 composites prepared by stir casting route.

Design/methodology/approach

In this study, AA6061 aluminium alloy matrix reinforced with varying weight percentages (3%, 4.5% and 6%) of ZnO particles, including monolithic AA6061 alloy samples, is cast by the most economical fabrication method, called stir casting. The prepared sample was subjected to X-ray photoelectron spectroscopy (XPS) analysis, experimental density measurement by Archimedian principle and theoretical density by rule of mixture and hardness test to investigate mechanical property. The dry sliding wear behaviour of the composites was investigated using pin-on-disc tribometer with various applied loads of 15 and 20 N, with constant sliding velocity and distance. The wear rate, coefficient of friction (COF) and worn surfaces of the composite specimens and their effects were also investigated in this work.

Findings

XPS results confirm the homogeneous distribution of ZnO microparticles in the Al matrix. The Vickers hardness result reveals that higher ZnO reinforced (6%) sample have 34.4% higher values of HV than the monolithic aluminium sample. The sliding wear tests similarly show that increasing the weight percentage of ZnO particles leads to a reduced wear rate and COF of 30.01% and 26.32% lower than unreinforced alloy for 15 N and 36.35% and 25% for 20 N applied load. From the worn surface morphological studies, it was evidently noticed that ZnO particles dispersed throughout the matrix and it had strong bonding between the reinforcement and the matrix, which significantly reduced the plastic deformation of the surfaces.

Originality/value

The uniqueness of this work is to use the reinforcement of ZnO particles with AA6061 matrix and preparing by stir casting route and to study and analyse the physical, hardness and tribological behaviour of the composite materials.



中文翻译:

搅拌铸造法制备ZnO增强AA6061基复合材料的摩擦学行为及分析

目的

工业应用中最有前途的替代品是颗粒增强金属基复合材料,因为它们具有良好的综合机械性能。目前,铝合金广泛满足了工业应用对基体材料的需求。本文的目的是评估通过搅拌铸造工艺制备的氧化锌 (ZnO) 颗粒增强 AA6061 复合材料的摩擦学行为。

设计/方法/方法

在这项研究中,使用不同重量百分比(3%、4.5% 和 6%)的 ZnO 颗粒增强 AA6061 铝合金基体,包括整体 AA6061 合金样品,通过最经济的制造方法进行铸造,称为搅拌铸造。对制备的样品进行X射线光电子能谱(XPS)分析,根据阿基米德原理进行实验密度测量,根据混合物和硬度试验进行理论密度测量,以研究其力学性能。复合材料的干滑动磨损行为使用销盘式摩擦计在 15 和 20 N 的各种施加载荷下,以恒定的滑动速度和距离进行研究。在这项工作中还研究了复合材料试样的磨损率、摩擦系数 (COF) 和磨损表面及其影响。

发现

XPS 结果证实了 ZnO 微粒在铝基体中的均匀分布。维氏硬度结果表明,较高 ZnO 增强 (6%) 样品的 HV 值比整体铝样品高 34.4%。滑动磨损试验类似地表明,增加 ZnO 颗粒的重量百分比导致磨损率和 COF 降低,在 15 N 和 36.35% 和 25% 的 20 N 施加载荷下,磨损率和 COF 比未增强合金低 30.01% 和 26.32%。从磨损表面形态研究可以明显看出,ZnO颗粒分散在整个基体中,增强体与基体之间具有很强的结合力,显着降低了表面的塑性变形。

原创性/价值

本工作的独特之处在于采用AA6061基体对ZnO颗粒的增强,采用搅拌浇铸法制备,对复合材料的物理、硬度和摩擦学行为进行了研究和分析。

更新日期:2021-05-31
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