Mechanical properties and tribological behavior of aluminum matrix composites reinforced with in-situ AlB2 particles

Abstract

. (2016). Mechanical properties and tribological behavior of aluminum matrix composites reinforced with in-situ AlB 2 particles. Tribology International, 98 41-47. Mechanical properties and tribological behavior of aluminum matrix composites reinforced with in-situ AlB2 particles AbstractAluminum matrix composites (AMCs) reinforced with in-situ AlB 2 particles have been fabricated using a combination of powder metallurgy, hot rolling and solution treatment. The effects of boron content (7 and 12 wt%), hot rolling and heat treatment parameters on the microstructures and mechanical properties of the composites were investigated by means of scanning electron microscopy (SEM), tensile test and microhardness measurements. The friction coefficient, wear behavior and scratch morphology of the AMCs and pure aluminum were also studied using scratch tests. The hardness and wear properties are higher in a case of composites when compared to unreinforced matrix material. Mechanical properties and tribological behavior of aluminum matrix composites reinforced with in-situ AlB2 particles Linlin Yuana, Jingtao Hana,*, Jing Liua，Zhengyi Jiangb aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China bSchool of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, 2500, Australia Abstract: Aluminum matrix composites (AMCs) reinforced with in-situ AlB2 particles have been fabricated using a combination of powder metallurgy, hot rolling and solution treatment. The effects of boron content (7 and 12 wt.%), hot rolling and heat treatment parameters on the microstructures and mechanical properties of the composites were investigated by means of scanning electron microscopy (SEM), tensile test and micro-hardness measurements. The friction coefficient, wear behavior and scratch morphology of the AMCs and pure aluminum were also studied using scratch tests. The hardness and wear properties are higher in a case of composites when compared to unreinforced matrix material.Keywords: Aluminum matrix composites, AlB2 reinforcement, Powder metallurgy, Wear *Corresponding author. E-mail address: hanjt@ustb.edu.cn(Jingtao Han) 1. Introduction Aluminum matrix composites(AMCs) reinforced with ceramic particles have been extensively used in the aircraft, aerospace and automotive industries because of their high stiffness, strength to weight ratio, low coefficient of thermal expansion and good wear resistance [1][2][3]. The particulate reinforcements most often added to the pure aluminum or alloys include SiC, SiO2, B4C, TiB2 and Al2O3 [4][5][6][7][8][9]. In previous studies, Khorshid et al. prepared the AMCs reinforced by two sizes of alumina particles by wet attrition milling and hot forward extrusion processes [10]. Haghighi et al. consolidated Al-5 vol.% nano-Al2O3 by equal channel angular pressing and extrusion and compared the physical and mechanical properties [11]. Vajargah et al. fabricated Al/TiB2 nano composites via powder metallurgy route through a primarily...

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