Investigations on microstructure, hardness and tribological behaviour of AA7075-Al2O3 composites synthesized via stir casting route

IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING
Mathusoothana Perumal Ezhilan, L. Emmanual, S. Alagarsamy, M. Meignanamoorthy
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Abstract

Aluminium matrix composite (AMC) materials play an important role in the field of automobile and aerospace industries due to their excellent properties. In this research, aluminium alloy (AA7075) was reinforced with alumina (Al2O3) particles to improve their hardness and tribological behaviour of the base alloy. Four composites were prepared by varying the content (4, 8 and 12 wt.%) of Al2O3 particles through the stir casting technique. The surface morphology of the proposed composites ensured the uniform distribution of Al2O3 particles into the matrix alloy. The hardness of the composite was measured using a Brinell hardness tester and the maximum value of hardness was found in the AA7075 - 8 wt.% Al2O3 composite. Hence, a tribological investigation was carried out on this AA7075 - 8 wt.% Al2O3 composite. Load (P), sliding speed (V) and sliding velocity (D) were taken as the wear parameters for conducting the experiments. A Technique for Order Preference by Similarity to Ideal Preferred Solution (TOPSIS) approach has been applied to find out the optimal conditions of parameters to obtain the lowest wear rate (WR) and the co-efficient of friction (COF). The results showed that the lowest WR and COF was obtained at ‘P’ of 15 N, ‘V’ of 1 m•s-1 and ‘D’ of 1000 m•s-1. ANOVA results revealed that ‘P’ is the factor with the most significant contribution (38.36%), followed by ‘D’ (28.32%). The worn surface morphology of the confirmation experiment specimen was investigated by SEM and the wear mechanism was reported.
通过搅拌铸造工艺合成的 AA7075-Al2O3 复合材料的微观结构、硬度和摩擦学特性研究
铝基复合材料(AMC)因其优异的性能在汽车和航空航天领域发挥着重要作用。在这项研究中,用氧化铝(Al2O3)颗粒对铝合金(AA7075)进行了增强,以提高其硬度和基合金的摩擦学性能。通过搅拌铸造技术,改变 Al2O3 颗粒的含量(4、8 和 12 wt.%),制备了四种复合材料。拟议复合材料的表面形态确保了 Al2O3 颗粒在基体合金中的均匀分布。使用布氏硬度计测量了复合材料的硬度,发现 AA7075 - 8 wt.% Al2O3 复合材料的硬度值最大。因此,对这种 AA7075 - 8 wt.% Al2O3 复合材料进行了摩擦学研究。载荷 (P)、滑动速度 (V) 和滑动速率 (D) 被作为进行实验的磨损参数。采用与理想优选方案相似的阶次优选法(TOPSIS)找出了获得最低磨损率(WR)和摩擦系数(COF)的最佳参数条件。结果表明,"P "为 15 N、"V "为 1 m-s-1、"D "为 1000 m-s-1 时,磨损率和摩擦系数最低。方差分析结果显示,"P "是影响最大的因素(38.36%),其次是 "D"(28.32%)。通过扫描电镜研究了确认实验试样的磨损表面形态,并报告了磨损机理。
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来源期刊
Revista De Metalurgia
Revista De Metalurgia 工程技术-冶金工程
CiteScore
1.30
自引率
25.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: Revista de Metalurgia is a bimonhly publication. Since 1998 Revista de Metalurgia and Revista Soldadura have been combined in a single publicación that conserves the name Revista de Metalurgia but also includes welding and cutting topics. Revista de Metalurgia is cited since 1997 in the ISI"s Journal of Citation Reports (JCR) Science Edition, and in SCOPUS.
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