Transactions of Nanjing University of Aeronautics & Astronautics
Dissolution Characteristics of New Titanium Alloys in Electrochemical Machining
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Abstract:
We focus on the electrochemical dissolution characteristics of new titanium alloys such as near-α titanium alloy Ti60, α+β titanium alloy TC4 and β titanium alloy Ti40 which are often used for aerospace industry. The experiments are carried out by electrochemical machining tool, and the surface morphology of the specimens is observed by the scanning electron microscope (SEM) and threedimensional video microscope (DVM). The appropriate electrolyte is selected and the relationships between surface roughness and current density are achieved. The results show that the singlephase titanium alloy Ti40 has a better surface roughness after ECM compared with the α+βtitanium alloy TC4 and the near-α titanium alloy Ti60. The best surface roughness is Ra0.28 μm when the current density is 75 A/cm2. Furthermore, the surface roughness of the near-α titanium alloy Ti60 is the most sensitive with the current density because of the different electrochemical equivalents of substitutional elements and larger grains than TC4. Finally, the suitable current density for each titanium alloy is achieved.
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