Effect of mechanical milling time on powder characteristic, microstructure, and mechanical properties of AA2024/B4C/GNPs hybrid nanocomposites

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-11-13 DOI:10.1016/j.powtec.2024.120439

Müslim Çelebi, Aykut Çanakçı, Serdar Özkaya

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Abstract

In this study, hybrid nanocomposites consisting of an AA2024 matrix reinforced with 1 wt% B₄C nanoparticles and 1 wt% GNPs were produced using a powder metallurgy method assisted by mechanical milling. This study aimed to systematically investigate the effect of grinding time on powder characteristics (particle size, microhardness, and morphology) as well as microstructure, densification, and mechanical performance to optimize processing conditions for superior material properties. Microstructural characterization of powders and bulk samples were carried out using a SEM device equipped with EDS. The results indicate that with increasing milling time, the particle size significantly decreased, while the particle hardness increased substantially. Additionally, the sample milled for 8 h achieved the highest relative density among the hybrid nanocomposites, reaching a value of 95.3 %. Mechanical tests revealed that after 8 h of milling, the hardness and tensile strength reached peak values of 164 HB and 314 MPa, corresponding to increases of 56 % in hardness and 43 % in tensile strength compared to the unreinforced alloy. The analysis results confirm that the optimal properties were obtained after 8 h under all conditions.

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机械研磨时间对 AA2024/B4C/GNPs 混合纳米复合材料粉末特性、微观结构和力学性能的影响

本研究采用机械研磨辅助粉末冶金方法制备了由 AA2024 基体与 1 wt% B4C 纳米粒子和 1 wt% GNPs 增强的混合纳米复合材料。本研究旨在系统研究研磨时间对粉末特性（粒度、显微硬度和形态）以及显微结构、致密化和机械性能的影响，以优化加工条件，获得优异的材料性能。使用配备 EDS 的扫描电镜设备对粉末和块状样品进行了微观结构表征。结果表明，随着碾磨时间的增加，颗粒尺寸明显减小，而颗粒硬度大幅增加。此外，在混合纳米复合材料中，碾磨 8 小时的样品相对密度最高，达到 95.3%。力学测试表明，碾磨 8 小时后，硬度和拉伸强度分别达到 164 HB 和 314 MPa 的峰值，与未增强合金相比，硬度和拉伸强度分别提高了 56% 和 43%。分析结果证实，在所有条件下，8 小时后都能获得最佳性能。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.