Abstract
In this work, surface morphology, corrosion resistance, and mechanical properties of tantalum sputtered NiTi in Ar and Ar–N2 atmospheres as well as room and 200 °C temperatures have been investigated. FESEM studies showed the positive effect of heat on forming a uniform and dense Ta layer under the Ar atmosphere whereas it left an adverse mark on coatings in the Ar–N2 atmosphere. XRD patterns depicted amorphous coatings in all samples meaning 200 °C was not sufficient for the formation of crystallized Ta. AFM 3D images of surface topographies suggested that smooth and compact layers were produced in the Ar-injected chamber while the coatings containing N in their chemical composition owned irregular ups and downs with a higher porosity degree. Electrochemical measurements indicated that despite nonuniformity, Ar–N2 coatings were more resistive whereas polarization resistance was at least three times greater than that of Ar coatings. Finally, nanoindentation results showed that the coating formed at 200 °C and Ar condition had the highest nano-hardness, Young's modulus, and elastic recovery. The sample coated in Ar–N2 condition and the same temperature, however, expressed the least mechanically-favorable character.
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