Machinability and Surface Morphology of TiB2 Reinforced Al 7075 MMC During EDM with Cryogenic Treated Cu Electrode

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Experimental Techniques Pub Date : 2024-11-25 DOI:10.1007/s40799-024-00767-0

R. C. Pradhan, D. Das, B. P. Sahoo, C. Samal

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引用次数: 0

Abstract

This work accentuates investigation of machinability of TiB₂/Al 7075 metal matrix composite (MMC) while electrical discharge machining (EDM) with cryogenic treated Cu electrode, following Taguchi L₆₄ design of experiments (DOE). Influences of peak current (I_P), pulse on time (T_ON) and gap voltage (V_G) on material removal rate (MRR), tool wear rate (TWR) and average surface roughness (R_a) were studied. Morphology of the machined surfaces was also explored through scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and elemental mapping. Results revealed increment of MRR (by about 55%) and TWR (by about 75%) on increasing I_P (from 4 A to 10 A at T_ON = 100µs at V_G = 55 V), but these responses reduced (by about 70% and 9%, respectively) on increasing V_G (from 55 V to 80 V at I_P = 4 A and T_ON = 100µs). R_a was influenced significantly by the I_P and T_ON levels. At 4 A of I_P, 200µs of T_ON and 55 V of V_G, SEM micrograph of the machined surface revealed craters, re-solidified regions, voids and cracks. On increasing the current level to 6 A keeping the other parameters constant, significant reduction of debris with larger craters were observed. On further increasing the current level to 10 A, minimal amount of debris, thicker ridges and deeper craters were witnessed from the machined surface microstructure.

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低温处理Cu电极对TiB2增强Al 7075 MMC的电火花加工性能和表面形貌的影响

根据田口L64实验设计（DOE），重点研究了低温处理铜电极电火花加工（EDM）时TiB2/Al 7075金属基复合材料（MMC）的可切削性。研究了峰值电流（IP）、脉冲导通时间（TON）和间隙电压（VG）对材料去除率（MRR）、刀具磨损率（TWR）和平均表面粗糙度（Ra）的影响。通过扫描电子显微镜（SEM）、能谱仪（EDS）和元素映射对加工表面的形貌进行了研究。结果显示，当IP从4 A增加到10 A， TON = 100µs, VG = 55 V时，MRR和TWR分别增加了约55%和75%，但当IP = 4 A, TON = 100µs时，VG从55 V增加到80 V时，MRR和TWR分别减少了约70%和9%。Ra受IP和TON水平的显著影响。在4 A的IP， 200µs的TON和55 V的VG下，加工表面的SEM显微照片显示出陨石坑，再固化区域，空洞和裂纹。在保持其他参数不变的情况下，将当前水平提高到6a，观察到较大陨石坑的碎片显著减少。当电流进一步增加到10 A时，从加工表面微观结构可以看到少量的碎片，更厚的脊和更深的陨石坑。

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

Experimental Techniques 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

5.2 months

期刊介绍： Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.