Relationship between Al2O3 Content and Wear Behavior of Al+2% Graphite Matrix Composites

D Simsek,D Ozyurek,I Simsek

doi:10.1515/secm-2020-0017

D Simsek, D Ozyurek + Show 1 more

Open Access

https://doi.org/10.1515/secm-2020-0017

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Abstract

Abstract In this study, the microstructure and wear behaviours of aluminium composites, reinforced with different amounts of (3-12%) Al2O3 and 2% (% vol.) graphite were investigated. The Al2O3 and graphite were added to Al matrix and mechanically alloyed for 60 minutes. Subsequently, the mechanically alloyed powders were pressed under 700MPa pressure and sintered at 600 ∘ C for 120 minutes. The produced aluminium composites were characterized by microstructure, scanning electron microscope (SEM), X-ray diffraction (XRD), density and hardness measurements. Afterwards, wear tests were carried out on a block on-ring type wear testing device, under three different loads and four different sliding distances. As a result, the hardness and density of composites were observed to increase due to the increase in the amount of reinforcement in aluminium composites. The highest hardness and density values were obtained in composite material containing 12% Al2O3. The wear tests, the lowest weight loss was also obtained in composite containing 12% Al2O3.

Highlights

Aluminium matrix composites (AMC) are materials that are produced with reinforcement of aluminium matrix with different materials [1, 2]
Results obtained from the study that investigates the wear behaviour of mechanically alloyed composite materials with different amounts of Al2O3 reinforcement to Al2Graphite matrix are given below:
– It is determined that the Al2O3 reinforcement to the Al+Graphite matrix in Al-Graphite-Al2O3 composite materials does not display a homogeneous distribution in the structure

Summary

Introduction

Aluminium matrix composites (AMC) are materials that are produced with reinforcement of aluminium matrix with different materials [1, 2]. Ceramic particle reinforced aluminium matrix composites have better mechanical. Alaname and Sanusi [25] reported that hybrid composite materials containing graphite had better wear resistance than composite materials without graphite, while increased graphite ratio reduced wear resistance. Premnath et al [26] in a similar study they conducted, they investigated the mechanical and tribological behavior of AMCs reinforced 5% by graphite and by 5%, 10% and 15% Al2O3 within Al matrix. In their results, they stated that the reinforcement amount is the dominating parameter. In the produce of composite materials, MA process is an important manufacturing method especially in Al-C (graphite) alloy system

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