Effect of reinforcement particle size on the corrosion and mechanical properties of spark plasma sintered aluminium matrix composites

IF 1.5 4区 工程技术 Q3 MICROSCOPY
Behzad Sadeghi, Pasquale Cavaliere, Mohsen Sanayei
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引用次数: 0

Abstract

In this study, the effects of different sizes of reinforcing particles on the corrosion behaviour and mechanical properties of aluminium (Al)-based composites produced by spark plasma sintering (SPS) are analysed. In the study, the effects of SPS parameters, including electrical power, applied pressure and sintering temperature, on the consolidation process and microstructure evolution of the composite are closely investigated. The results reveal a nuanced relationship between the sintering conditions and the properties of the particles, which in turn determine the sintering dynamics and the formation of the microstructural features. The evaluation of mechanical properties indicates a remarkable influence of particle size distribution on the hardness of the composites, showing an initial improvement with the introduction of nanoparticles, followed by a slight decrease as the balance between nano- and micron-sized Al2O3 particles shifts. A scanning electron microscopy (SEM) study demonstrates the influence of particle dimensions on the change of grain boundaries and the spatial arrangement of the composite matrix. Electrochemical experiments in a 0.1 M NaCl solution show a consistent corrosion potential (Ecorr) across all samples, while the current densities associated with corrosion (icorr) show considerable variation. The presence of nano-sized Al2O3 particles was found to increase corrosion resistance, in contrast to the detrimental effects observed with larger microparticles. In particular, composites with a bimodal distribution of particle sizes showed a 3.5-fold increase in corrosion resistance compared to pure Al. The specific Al-2n8mAl2O3 composite that exhibited active electrochemical properties at elevated potentials without a defined passivation range emphasises the significant role of particle size. This study draws attention to bimodal microstructures as a promising route to achieving uniformity and improved corrosion resistance in Al matrix composites, while pointing to the need for further research to fully elucidate the operative mechanisms.

增强粒度对火花等离子烧结铝基复合材料的腐蚀和机械性能的影响。
本研究分析了不同尺寸的增强颗粒对火花等离子烧结(SPS)法生产的铝(Al)基复合材料的腐蚀行为和机械性能的影响。研究还密切关注了 SPS 参数(包括电功率、施加压力和烧结温度)对复合材料固结过程和微观结构演变的影响。研究结果表明,烧结条件与颗粒特性之间存在微妙的关系,而颗粒特性又决定了烧结动力学和微观结构特征的形成。对机械性能的评估表明,粒度分布对复合材料的硬度有显著影响,随着纳米颗粒的引入,硬度最初有所提高,但随着纳米和微米尺寸 Al2O3 颗粒之间平衡的改变,硬度略有下降。扫描电子显微镜(SEM)研究表明了颗粒尺寸对晶界变化和复合基体空间排列的影响。在 0.1 M NaCl 溶液中进行的电化学实验表明,所有样品都具有一致的腐蚀电位(Ecorr),而与腐蚀相关的电流密度(icorr)则显示出相当大的差异。研究发现,纳米级 Al2O3 粒子的存在可提高耐腐蚀性,而较大的微粒子则会产生不利影响。特别是,与纯铝相比,颗粒大小呈双峰分布的复合材料的耐腐蚀性提高了 3.5 倍。特定的 Al-2n8mAl2O3 复合材料在高电位下表现出活跃的电化学特性,而没有确定的钝化范围,这强调了颗粒大小的重要作用。这项研究提请人们注意双模微结构是实现铝基复合材料均匀性和提高耐腐蚀性的一条可行途径,同时指出需要进一步研究以充分阐明其作用机制。
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来源期刊
Journal of microscopy
Journal of microscopy 工程技术-显微镜技术
CiteScore
4.30
自引率
5.00%
发文量
83
审稿时长
1 months
期刊介绍: The Journal of Microscopy is the oldest journal dedicated to the science of microscopy and the only peer-reviewed publication of the Royal Microscopical Society. It publishes papers that report on the very latest developments in microscopy such as advances in microscopy techniques or novel areas of application. The Journal does not seek to publish routine applications of microscopy or specimen preparation even though the submission may otherwise have a high scientific merit. The scope covers research in the physical and biological sciences and covers imaging methods using light, electrons, X-rays and other radiations as well as atomic force and near field techniques. Interdisciplinary research is welcome. Papers pertaining to microscopy are also welcomed on optical theory, spectroscopy, novel specimen preparation and manipulation methods and image recording, processing and analysis including dynamic analysis of living specimens. Publication types include full papers, hot topic fast tracked communications and review articles. Authors considering submitting a review article should contact the editorial office first.
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