Evaluating comparative wear behaviour of Al-15%Si based alloy/composites reinforced with zinc and zirconium oxide

IF 1.6 Q4 MATERIALS SCIENCE, COATINGS & FILMS Tribology - Materials, Surfaces & Interfaces Pub Date : 2023-04-03 DOI:10.1080/17515831.2023.2239689

Vijaykumar L. Chavan, R. V. Kurahatti, J. Haider, D. Goudar, I. S. Patil

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Abstract

ABSTRACT The tribological characteristics of stir cast Al-15%Si-10%Zn matrix with 15%ZrO2 reinforced composite were investigated. The microstructure of the Al-15Si alloy consisted of coarse primary Si and acicular eutectic Si phases randomly distributed in the Al dendrites. The Al-15%Si-10%Zn/ZrO2 composite showed spherical Si with a size between 25 and 75 µm; fragmented eutectic Si phase and uniform dispersion of ZrO2 particles in the matrix. The wear test was conducted using in a pin-on-disc method at different loads and sliding velocities. It was found reduced coefficient of friction, significant increase in the hardness and wear resistance of the composite compared to the matrix alloy. High wear resistance in the composite due to the effect of solid lubrication provided by Zn, and good fracture toughness and wear resistance by the reinforced ZrO2 particles. The predominant oxidative and abrasive wear were identified as the mechanisms leading to material failure through plastic deformation and delamination. GRAPHICAL ABSTRACT

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锌和氧化锆增强Al-15%Si基合金/复合材料的对比磨损性能评价

研究了搅拌铸造Al-15%Si-10%Zn基复合材料与15%ZrO2复合材料的摩擦学性能。Al-15Si合金的显微组织由粗大的初生Si和随机分布在Al枝晶中的针状共晶Si相组成。Al-15%Si-10%Zn/ZrO2复合材料显示出尺寸在25至75µm之间的球形Si；破碎的共晶Si相和ZrO2颗粒在基体中的均匀分散。在不同载荷和滑动速度下，采用销-盘法进行磨损试验。研究发现，与基体合金相比，复合材料的摩擦系数降低，硬度和耐磨性显著提高。由于Zn提供的固体润滑作用，复合材料具有较高的耐磨性，增强的ZrO2颗粒具有良好的断裂韧性和耐磨性。主要的氧化磨损和研磨磨损被确定为通过塑性变形和分层导致材料失效的机制。图形摘要

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Tribology - Materials, Surfaces & Interfaces MATERIALS SCIENCE, COATINGS & FILMS-

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