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Surface characteristics of Ti-5Al-2.5Sn in electrical discharge machining using negative polarity of electrode
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Surface characteristics of Ti-5Al-2.5Sn in electrical discharge machining using negative polarity of electrode
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Journal Article
Surface characteristics of Ti-5Al-2.5Sn in electrical discharge machining using negative polarity of electrode
2017
Overview
A large number of parameters significantly affect the performance of electrical discharge machining (EDM) which is a non-conventional technique. The choice of the EDM parameters depends on workpiece-electrode material combination. So, the selection of parameters becomes intricate. This manuscript presents the surface characteristics of the machined surface in EDM on Ti-5Al-2.5Sn titanium alloy. The surface roughness and the microstructure of the machined surface are explored for different EDM parameters and electrode materials. Experimentation was accomplished using negative polarity of copper, copper-tungsten and graphite electrode. In this study, peak current, pulse-on time, pulse-off time and servo-voltage are taken into consideration as process variables. The surface roughness is greatly influenced by peak current and pulse-on time among the selected electrical parameters. Among the three electrodes, the copper electrode produces the lowest surface roughness whilst graphite electrode gives the highest surface roughness. The surface characteristics (crater, crack and globule) are distorted on account of discharge energy. In context of fine surface characteristics, the copper can become as first choice electrode materials.
Publisher
Springer London,Springer Nature B.V
