Metals and Materials International ( IF 3.3 ) Pub Date : 2020-03-02 , DOI: 10.1007/s12540-020-00644-6
Buraq Talib Shalash AL-Mosawi , David Wexler , Andrzej Calka
|
Abstract
Al-matrix composites reinforced with variant quantity of milled carbon fibers (MCFs) were manufactured via uniball magneto milling and uniaxial hot pressing (UHP). Cylindrical compacts of these composites were produced at approximately 600 °C for 15 min and 70 MPa uniaxial pressure in an argon atmosphere. The microstructure of powders and consolidated composite samples were studied by X-ray diffractometry and field emission scanning electron microscope with energy dispersive spectroscopy. 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 specific wear rate. Results show that Al + 20 vol% of MCFs has a higher compressive strength of (710 ± 32) MPa and modulus of elasticity of (15 ± 2) GPa compared to other composites and unreinforced Al sample. There are several factors that could be participate in improving the composite properties. These reasons included enhanced interface between Al matrix and MFCs, free of porosity, refined microstructure, and improved wetting between MFCs and Al matrix. Also, the specific wear rate of the composite was decreased when the MCFs volume fraction increases from 5 to 20%. This might propose that MFCs reduced the wear of the composites by acting as a self-lubrication material and might be suggested when using these types of composites in components sliding against hard surface. The notable composite properties were found at processing parameters of 50 h milling time and UHP at 600 °C for 15 min under 70 MPa applied pressure.
Graphic Abstract
中文翻译:

单球磨单轴热压合成铝增强碳纤维复合材料的表征和性能
摘要
用不同数量的研磨碳纤维 (MCF) 增强的铝基复合材料是通过单球磁磨和单轴热压 (UHP) 制造的。这些复合材料的圆柱形压块是在氩气气氛中在大约 600°C 和 70 MPa 单轴压力下生产 15 分钟。采用X射线衍射仪和场发射扫描电子显微镜结合能量色散光谱研究了粉末和固结复合样品的微观结构。通过阿基米德密度、维氏显微硬度、弹性模量、最大抗压强度、屈服强度、纳米压痕和比磨损率来评估大块样品的物理和机械性能。结果表明,与其他复合材料和未增强的 Al 样品相比,Al + 20 vol% 的 MCF 具有 (710 ± 32) MPa 的更高压缩强度和 (15 ± 2) GPa 的弹性模量。有几个因素可以参与改善复合材料的性能。这些原因包括增强了 Al 基体和 MFC 之间的界面、无孔隙、细化了微观结构以及改善了 MFC 和 Al 基体之间的润湿。此外,当 MCFs 体积分数从 5% 增加到 20% 时,复合材料的比磨损率降低。这可能表明 MFC 通过充当自润滑材料来减少复合材料的磨损,并且可能建议在将这些类型的复合材料用于与硬表面滑动的部件中时。