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

IF 1.8 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Rahul Chandra Pradhan, Diptikanta Das, Barada Prasanna Sahoo, Chandrika Samal
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引用次数: 0

Abstract

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.
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
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。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
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.
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