Formation of Gradient Micro-Porous Titanium-Aluminides Through Elemental Powder Metallurgy
International Journal of Materials Science and Applications
Volume 7, Issue 2, March 2018, Pages: 33-38
Received: May 31, 2017;
Accepted: Jun. 12, 2017;
Published: Jan. 18, 2018
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Cynthia Kornegay Waters, Mechanical Engineering, North Carolina A&T State University, Greensboro, NC, USA
Gerald Ross Vosburg, Mechanical Engineering, North Carolina A&T State University, Greensboro, NC, USA
Stephen Ajinola, Mechanical Engineering, North Carolina A&T State University, Greensboro, NC, USA
The research into alloys, specifically titanium and aluminum alloys (Ti & Al), has rapidly growing technological importance. The combined research into Ti-Al alloys in the field of powder metallurgy has advanced the fabrication of a part with high compressive strength, low relative density and material properties in addition to being a cost-effective process. In this work Ti-Al alloys were created using elemental Ti and Al powders. Elemental powders with a melting point of over 1000°C were sintered via liquid phase sintering (LPS). LPS is a process used for forming high performance, multiple-phase components from powders. It involves sintering at a temperature between the melting points of the two powders. The structural morphology, pore size and location were evaluated using Scanning Electron Microscopy (SEM) and optical microscopy. These methods allowed visible evidence of structural anomalies providing a capillary action which pulled the liquid Al to the surface and resulted into a densification of the part at the surfaces. The dense structure was seen on both the top and bottom of the samples with a layer of predominantly Al. The average on the top surface layer using optical measurements was 0.48mm and the bottom was 0.97mm.
Cynthia Kornegay Waters,
Gerald Ross Vosburg,
Formation of Gradient Micro-Porous Titanium-Aluminides Through Elemental Powder Metallurgy, International Journal of Materials Science and Applications.
Vol. 7, No. 2,
2018, pp. 33-38.
Ramakrishnan, P., “History of Powder metallurgy”, Indian Journal of History of Science, 18(1): 109-114, (1983).
Eustathopoulos, N. & Voytovych, R., “The role of reactivity in wetting by liquid metals: a review” J Mater Sci, 51: 425, (2016).
Manu, K. S., Raag, L. A., Rajan, T. P. D., Gupta, M., & Pai, B. C., “Liquid Metal Infiltration Processing of Metallic Composites: A Critical Review”, Metallurgical and Materials Transactions B, 47(5), 2799-2819, (2016).
German, R. M., Suri, P., & Park, S. J. “Review: liquid phase sintering”, Journal of Materials Science, 44(1), 1-39. (2009).
Hwang, K. S., German, R. M., and Lenel, F. V., "Capillary Forces Between Spheres During Agglomeration and Liquid Phase Sintering," Metall. Trans., vol. 18A, pp. 11_17, (1987).
Kim, S., Kim, G., Lee, W., Lee, H. S., Jeung, W., “A novel method to fabricate reinforced Ti composites by infiltration of Al (Mg) into porous titanium”, Journal of Alloys and Compounds, Volume 715, Pages 404–412, (2017).
Dobrzański, L., Matula, G., Dobrzańska-Danikiewicz, A., Malara, P., Kremzer, M., Tomiczek, B., Kujawa, M., Hajduczek, E., Achtelik-Franczak, A., Dobrzański, L., Krzysteczko, J., “Composite Materials Infiltrated by Aluminium Alloys Based on Porous Skeletons from Alumina, Mullite and Titanium Produced by Powder Metallurgy Techniques”, Powder Metallurgy - Fundamentals and Case Studies, Chapter 5, published by Intech, (2017).
Peters, M., Hemptenmacher, J., Kumpfert, J., & Leyens, C., Structure and Properties of Ti and Ti Alloys Ti and Ti Alloys (pp. 1-36): Wiley-VCH Verlag GmbH & Co. KGaA. (2005).
Guide, T. A., RMI Ti Company an RTI International Metals. Inc. Company. (2000).
Torres, Y., Lascano, S., Bris, J., Pavón, J., & Rodriguez, J. A., Development of porous Ti for biomedical applications: A comparison between loose sintering and space-holder techniques. Materials Science and Engineering: C, 37, 148-155. (2014).
Campbell, F. C., Elements of metallurgy and engineering alloys. Materials Park, Ohio, (2008).
Huo, S., Heath, B., & Ryan, D., Applications of Powder Metallurgy Als for Automotive Valve-Trains., (2008).
Henriques, V. A., Bellinati, C. E., & da Silva, C. R., Production of Ti–6% Al–7% Nb alloy by powder metallurgy (P/M). Journal of Materials Processing Technology, 118(1), 212-215., (2001).