Abstract
In this work, compressive and thermal properties of aluminum, milled aluminum, and Al-10Al2O3 composite processed via ball milling (BM) and spark plasma sintering (SPS) were investigated. The microstructural features of powders and sintered samples were characterized using optical and scanning electron microscopy. A universal testing machine was used to determine the compressive properties of the consolidated samples. The thermal conductivity and coefficient of thermal expansion of the developed materials were characterized using a hot disc thermal constant analyzer and a dilatometer, respectively. The Al-10Al2O3 composite possessed hardness of 1309.7 MPa, yield strength of 311.4 MPa, and compressive strength of 432.87 MPa compared to hardness of 326.3 MPa, yield strength of 74.33 MPa, and compressive strength of 204.43 MPa for aluminum. The Al-10Al2O3 composite had thermal conductivity value 81.42 W/mK compared to value of 198.09 W/mK for aluminum. In the temperature range from 373 K to 723 K, the composite had lower CTEs ranging from 10 ? 10?6 to 22 ? 10?6/K compared to 20 ? 10?6 to 30 ? 10?6/K for aluminum.
Highlights
Nanoparticle reinforced metal matrix composites (NPMMCs) are candidate materials suiTab. for various applications in the aerospace, automotive, and transportation industries
The Al2O3 nanoparticles act as grinding medium and enhance the milling effect, which contribute to further refinement of the α-aluminum phase
Compressive strength and thermal properties of aluminum, milled aluminum, and Al10Al2O3 composite processed via ball milling (BM) and spark plasma sintering (SPS) were investigated
Summary
Nanoparticle reinforced metal matrix composites (NPMMCs) are candidate materials suiTab. for various applications in the aerospace, automotive, and transportation industries. These materials consist of a ductile metal matrix reinforced with a hard and stiff ceramic phase [1,2,3,4]. The design goal for the development of these composites is to obtain materials with improved mechanical and/or functional properties. These properties are influenced by the attributes of the individual components, the interface between the matrix and reinforcement, and the extent of reinforcement dispersion, and the synthesis and consolidation processes [2, 5,6,7]. The method was used to synthesise homogenous Al-Al2O3 nanocomposite powders that have
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