^*Corresponding author: djafia.ziad@gmail.com

ABSTRACT

Aiming to develop alloys with good properties for orthopedic applications, the focus of the present research is to evaluate the effect of Nb at.% content on structural, mechanical and tribological properties of hot isostatically pressed β- type Ti-XNb (X = 0, 4, 12, 16, 20 at.%) alloys. The structural evolution, mechanical properties and tribological behavior of the nanostructured Ti-XNb alloys were evaluated using X-Ray diffraction, Scanning Electron microscope and ball on disk tribometer. The wear tests were carried out in accordance with the ASTMG 99, ASTM G 13395 and ISO 7148-1:2012, standards under different applied loads of 2, 8 and 16 N respectively.
Experimental results indicated that structural evolution and morphological changes of the milled alloys were sensitive to their Niobioum (Nb) content. The morphological characterization showed that the crystallite size and the particle size decrease with increasing Nb content (at. %) reaching the lowest values of 28 and 30 nm in the case of Ti-15Nb and Ti-20Nb, respectively. The coefficient of friction and wear rate were lower in the binary titanium alloys with 15 and 20 at. % Nb content. This improvement in wear and friction resistance is attributed to the closed porosity and grain refinement for binary Ti- alloys with 15 and 20 Nb.
.References
[1] M. Fellah, M. Laba, O. Assala, L. Dekhil. L, and A. Iost, Journal of Biomaterial and Nanobiotechnology, 4 (4) (2013) 374-384.
[2] M. Fellah, A. Linda, M. Abdul Samed, A. Montagne, Acta Metallurgica Scinica (English letter), 30 (11) (2017) 1089-1099
[3] M. Fellah, M. Laba, O. Assala, L. Dekhil, and A. Iost, Advances in Tribology, 7, Article ID451387, (2014) 13 pages. http://dx.doi.org/10.1155/2014/451387.
[4] M. Fellah, M. Laba, O. Assala. O, Dekhil. L, and Iost. A, Matiaux & Techniques, 102 (6-7) (2014) 601-612.