Sintering Properties of Mechanically Alloyed Ti-5Al-2.5Fe

Authors: Ridvan Yamanoglu, Erdinc Efendi, Ismail Daoud

Abstract:

In this study, Ti-5Al-2.5Fe alloy was prepared by powder metallurgy. The elemental titanium, aluminum, and iron powders were mechanically alloyed for 10 h in a vacuum atmosphere. A stainless steel jar and stainless steel balls were used for mechanical alloying. The alloyed powders were then sintered by vacuum hot pressing at 950 °C for a soaking time of 30 minutes. Pure titanium was also sintered at the same conditions for comparison of mechanical properties and microstructural behavior. The samples were investigated by scanning electron microscopy, XRD analysis, and optical microscopy. Results showed that, after mechanical alloying, a homogeneous distribution of the elements was obtained, and desired a-b structure was determined. Ti-5Al-2.5Fe alloy was successfully produced, and the alloy showed enhanced mechanical properties compared to the commercial pure titanium.

Keywords: Ti5Al2.5Fe, mechanical alloying, hot pressing, sintering.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1129940

References:

[1] Dutta, B., Froes, F. H., The additive manufacturing (AM) of titanium alloys, Titanium Powder Metallurgy, Elsevier, 2015.
[2] Shah, F.A., Trobos, M., Thomsen, P., Palmquist, A., “Commercially pure titanium (CP-Ti) versus titanium alloy (Ti6Al4V) materials as bone anchored implants – Is ore truly better than the other?”, Materials Science and Engineering C, 62, 960-966, 2016.
[3] Sha W., Malinov S., Titanium alloys: modelling of microstructure, properties and applications, CRC Press, Washington, 2009.
[4] Park J., Jeong G., Kang S., Lee S.J., Choi H., Fabrication of Fe-Cr-Mo powder metallurgy steel via a mechanical-alloying process, Metals and Materials International, 2015, 21(6), 1031-1037.
[5] Bolzoni L., Ruiz-Navas E.M., Neubauer E., Gordo E., Mechanical properties and microstructural evolution of vacuum hot-pressed titanium and Ti–6Al–7Nb alloy, Journal of the Mechanical Behavior of Biomedical Materials, 2012, 9, 91-99.
[6] Bolzoni L., Ruiz-Navas E.M., Gordo E., Feasibility study of the production of biomedical Ti–6Al–4V alloy by powder metallurgy, Materials Science and Engineering, 2015, 49, 400-407.
[7] Siqueira R.P., Sandim H.R.Z. Hayama A.O.F., Henriques V.A.R., Microstructural evolution during sintering of the blended elemental Ti–5Al–2.5Fe alloy, Journal of Alloys and Compounds, 2009, 476, 130-137.
[8] Suryanarayana, C. “Mechanical alloying and milling”, Progress in Materials Science, 46, 1-184, 2001.
[9] Zadra, M., “Mechanical alloying of titanium”, Materials Science and Engineering A, 583, 105-113, 2013.
[10] Yamanoglu R., Production and characterization of Al-xNi in situ composites using hot pressing, Journal of Mining and Metallurgy Section B: Metallurgy, 2014, 50, 45-52.
[11] Yamanoglu R., In Situ Aluminum Alloy Coating on Magnesium by Hot Pressing, Acta Metallurgica Sinica (English Letters), 2015, 28(8), 1059-1064.
[12] Suk-Joong L. Kang, Sintering: Densification, grain growth, and microstructure, Elsevier, 2005.
[13] German, R.M., Sintering theory and practice, Wiley, 1996.