Influence of the phases' stabilization on corrosion behavior of novel Ti-10Mo-xZr alloys for Bio-implants applications.

Document Type : Original Article

Authors

1 Department of Production Engineering and Mechanical Design, Faculty of Engineering, Port Said University, Port Said 42526, Egypt

2 Design and Production Department, Faculty of Engineering Ain Shams University, Cairo 11535, Egypt

3 Central Metallurgical Research and Development Institute (CMRDI), Helwan 11421, Egypt

Abstract

Newly designed titanium alloys composed of vital elements are being researched to represent alternatives to commercial alloys, and Zr addition to Ti-10Mo alloy is investigated through corrosion tests in saline media. All studied alloys are in the α+β region designed using the d-orbital method after applying the equivalent Mo ([Mo]eq) concentrations equation. The microstructure analysis approved the appearance of α laths and β grains with varied percentages measured from XRD diffraction. The β phase amount in the studied alloys is inversely proportional to the corrosion rate. β phase percentages are 94.6%, 52.5% and 82.3%, opposed to corrosion rates of 0.95451× 10-3, 1.7819× 10-3, and 1.0288× 10-3 mm/year for (Ti-10Mo, Ti-10Mo-3Zr, and Ti-10Mo-6Zr) wt% alloys, respectively. These findings agree with a previous study on Ti-Mo-Zr alloys. Large difference stabled phases induce potential difference, causing micro galvanic cells to result in high corrosion as achieved in Ti-10Mo-3Zr alloy. Zr addition forms a protective layer over implant material, which influences appeared in Ti-10Mo-6Zr alloy.

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