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Buraq Talib Shalash AL‑Mosawi,David Wexler,Andrzej Calka 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
Al-matrix composites reinforced with variant quantity of milled carbon fibers (MCFs) were manufactured via uniball magnetomilling and uniaxial hot pressing (UHP). Cylindrical compacts of these composites were produced at approximately600 °C for 15 min and 70 MPa uniaxial pressure in an argon atmosphere. The microstructure of powders and consolidatedcomposite samples were studied by X-ray diffractometry and field emission scanning electron microscope with energy dispersivespectroscopy. The physical and mechanical properties of the bulk samples were estimated by Archimedes density,Vickers microhardness, modulus of elasticity, maximum compressive strength, yield strength, nanoindentation, and specificwear rate. Results show that Al + 20 vol% of MCFs has a higher compressive strength of (710 ± 32) MPa and modulus ofelasticity of (15 ± 2) GPa compared to other composites and unreinforced Al sample. There are several factors that couldbe participate in improving the composite properties. These reasons included enhanced interface between Al matrix andMFCs, free of porosity, refined microstructure, and improved wetting between MFCs and Al matrix. Also, the specific wearrate of the composite was decreased when the MCFs volume fraction increases from 5 to 20%. This might propose thatMFCs reduced the wear of the composites by acting as a self-lubrication material and might be suggested when using thesetypes of composites in components sliding against hard surface. The notable composite properties were found at processingparameters of 50 h milling time and UHP at 600 °C for 15 min under 70 MPa applied pressure.
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