Microstructure and Corrosion Resistance of 7075 Aluminium Alloy Composite Material Obtained from Chips in the High-Energy Ball Milling Process.

IF 3.1 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Materials Pub Date : 2024-10-31 DOI:10.3390/ma17215331
Barbara Kościelniak, Diana Groch, Wojciech J Nowak, Marcin Drajewicz, Przemysław Kwolek
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Abstract

The high-energy ball milling process was applied to fabricate a composite material from 7075 aluminium alloy milling chips, silicon carbide, and titanium dioxide powders. Raw materials were ground, and the obtained powders were cold pressed and sintered. It was demonstrated that this method can be used in the recycling of aluminium alloy scrap characterised by a high surface-to-volume ratio, and also that chemical removal of the oxide layer from chips is not necessary. The finest particles, with 50 vol.% of their population below 36 μm, were obtained after grinding for 60 min at a 1000 rpm rotational speed. Such an intensive grinding was necessary to fabricate the compact composite material with a homogeneous microstructure and a low porosity of 0.7%. The corrosion resistance of the composites was studied in 3.5 wt.% NaCl solution using cyclic voltammetry and electrochemical impedance spectroscopy, and corrosion rates in the range of ca. 342 and 3 μA∙cm-2 were obtained. The corrosion mechanism includes aluminium alloy dissolution at the matrix/reinforcement interphase and around intermetallic particles localised within the matrix grains.

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通过高能球磨工艺从切屑中获得的 7075 铝合金复合材料的微观结构和耐腐蚀性能。
应用高能球磨工艺,用 7075 铝合金铣屑、碳化硅和二氧化钛粉末制造了一种复合材料。原材料经过研磨,得到的粉末经过冷压和烧结。结果表明,这种方法可用于回收表面体积比高的铝合金废料,而且无需用化学方法去除铝屑上的氧化层。在 1000 转/分的转速下研磨 60 分钟后,可获得最细的颗粒,其总量的 50 Vol.% 低于 36 μm。要制造出微观结构均匀、孔隙率低至 0.7% 的致密复合材料,就必须进行如此密集的研磨。使用循环伏安法和电化学阻抗光谱法研究了复合材料在 3.5 wt.% NaCl 溶液中的耐腐蚀性,结果表明腐蚀速率范围分别为约 342 和 3 μA∙cm-2。腐蚀机理包括基体/增强体相间的铝合金溶解以及基体晶粒中局部金属间颗粒周围的铝合金溶解。
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来源期刊
Materials
Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
5.80
自引率
14.70%
发文量
7753
审稿时长
1.2 months
期刊介绍: Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.
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