通过粉末混合电火花加工研究纳米 TiB2 和 AlN 接枝 MWCNT 杂化 Al 7075 基体三元复合材料的可加工性和表面改性

IF 1.8 4区工程技术 Q3 ENGINEERING, MECHANICAL

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science Pub Date : 2024-06-24 DOI:10.1177/09544062241257088

Rahul Chandra Pradhan, Diptikanta Das, Barada Prasanna Sahoo, Chandrika Samal

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引用次数: 0

摘要

本文重点介绍了一种新设计的纳米 TiB2 和 AlN 接枝多壁碳纳米管（MWCNT）杂化 Al 7075 基体三元复合材料的粉末混合电火花加工（EDM）性能。混合金属基复合材料（MMC）是通过挤压铸造工艺制成的，在此之前经过了两阶段的增强添加、机械搅拌和超声波处理。电火花加工使用低温处理过的铜电极和 Al2O3 粒子混合介质。以材料去除率（MRR）、刀具磨损率（TWR）和平均表面粗糙度（Ra）为质量指标，研究了电火花加工工艺变量，即峰值电流（I P）、脉冲开启时间（T ON）和粉末浓度（P C）对混合 MMC 加工性的影响。研究还通过扫描电子显微镜（SEM）、能量色散 X 射线光谱（EDS）和元素图谱探讨了加工和添加 Al2O3 粒子对混合 MMC 表面形貌的影响。结果显示，与非混合（传统）电火花加工相比，混合粉末电火花加工的 MRR 提高了，TWR 降低了，表面光洁度改善了。在电介质中使用浓度为 1.5 g/l 的粉末时，加工表面的 Al2O3 颗粒沉积痕迹最大。

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Machinability investigation and surface modification of nano-TiB2 and AlN grafted MWCNT hybridized Al 7075 matrix ternary composite through powder-mixed EDM

This paper accentuates powder-mixed electrical discharge machining (EDM) performance of a newly designed nano-TiB2 and AlN grafted multiwall carbon nano-tube (MWCNT) hybridized Al 7075 matrix ternary composite. The hybrid metal matrix composite (MMC) was fabricated through squeeze casting route, preceded by two-stage reinforcement addition, mechanical agitation, and ultrasonic treatment. EDM was carried out using cryogenic treated Cu electrode and Al2O3 particle-mixed dielectric medium. Influence of EDM process variables, that is, peak current ( I P), pulse-on time ( T ON), and powder concentration ( P C) on machinability of the hybrid MMC was studied considering material removal rate (MRR), tool wear rate (TWR), and average surface roughness ( Ra) as quality indicators. Effects of machining and Al2O3 particle addition on surface morphology of the hybrid MMC were also explored through scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and elemental mapping. Results reveal elevation of MRR, reduction of TWR and improvement of surface finish during powder-mixed EDM in comparison to the non-mixed (conventional) EDM. Maximum traces of Al2O3 particle deposition was identified on the machined surfaces while using the powder concentration of 1.5 g/l within the dielectric.

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 工程技术-工程：机械

CiteScore

3.80

自引率

10.00%

发文量

625

审稿时长

4.3 months

期刊介绍： The Journal of Mechanical Engineering Science advances the understanding of both the fundamentals of engineering science and its application to the solution of challenges and problems in engineering.