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Microstructure and Mechanical Characterization of NiTi Wire Coating on Ti-6Al-4V Alloy Substrate by Tungsten Inert Gas (TIG) Surfacing Process
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DOI：10.1134/S1067821225601303.png)
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Abstract
En 中文
NiTi wire coating was applied to titanium alloy (Ti-6Al-4V) to develop its surface mechanical characteristics using TIG heat source. The TIG cladding process was used to melt a 1 mm diameter NiTi wire, creating a clad layer on the Ti-6Al-4V substrate. The present study investigates the effect of varying TIG welding currents (45-65 A) on the clad surface, focusing on changes in microstructure, phase evolution, hardness, and wear resistance. At a current of 45 A, the clad layer exhibited a peak average hardness of 754 HV, which is approximately 2.4 times higher than that of the base Ti-6Al-4V alloy. EDS and XRD analyses identified NiTi, NiTi2, unreacted Ti, and TiAl3, phases, along with intermetallic compounds, which contributed to the enhanced mechanical characteristics. The NiTi clad layer experienced wear height losses between 0.042 and 0.160 mm, whereas the Ti-6Al-4V substrate recorded a greater loss of 0.38 mm, demonstrating that the NiTi coating offered up to nine times improved wear resistance.
Keywords:
NiTi wire
TIG coating
Ti-6Al-4V alloy
wear resistance
microhardness
XRD
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