This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Microstructural Study of Ti-6Al-4V Produced with TiH 2 Powder
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 02, 2012 by SAE International in United States
Annotation ability available
In the aerospace industry, 80-90% of the titanium used in airframes has been from Ti-6Al-4V. This alloy is used throughout the section of an aircraft - fuselage, nacelles, landing gear, wing and empennage. In gas turbine engines Ti-6Al-4V is used in static and rotating components. Castings are used for the manufacture of more complex static components; forgings are typically used for moving parts. Conventional methods for obtaining titanium alloys require special conditions of controlled atmosphere that culminates in a high production cost. In this paper it was investigated the peculiarities of the typical microstructure of Ti-6Al-4V produced by powder metallurgy using TiH₂ powder. Samples were produced from the initial mixture of Al, V and TiH₂ powders, followed by cold uniaxial and isostatic pressing with subsequent densification by sintering in temperatures between 800-1400°C, in vacuum. Sintered samples were characterized by means of x-ray diffraction, Vickers micro hardness, scanning electron microscopy and density analysis. Due to the complete dissolution of the alloying elements in the titanium matrix and the presence of hydrogen during the sintering stage, an improved combination of homogenous microstructure, densification and mechanical properties could be achieved.
Citationdo Nascimento Filho, E., Henriques, V., de Oliveira, J., and Diniz, E., "Microstructural Study of Ti-6Al-4V Produced with TiH2 Powder," SAE Technical Paper 2012-36-0197, 2012, https://doi.org/10.4271/2012-36-0197.
- Froes, F.H. Eylon, D. Developments in titanium powder metallurgy Journal of Metals 32 47 54 1980
- Boyer, R.R. Aerospace applications of beta titanium alloys Journal of Metals 46 20 23 1994
- Allen, P. Titanium alloy development Advanced Materials & Processes 10 35 37 1996
- Su, Y. Wang, L. Luo, L. Liu, X. Guo, J. Fu, H. Investigation of melt hydrogenation on the microstructure and deformation behavior of Ti-6Al-4v alloy International Journal of Hydrogen Energy 36 1027 1036 2011
- Donachie, M.J. Titanium: a Technical Guide ASM Metals Park 1988
- Wildgoose, P. Powder metallurgical innovations for improved hot-section alloys in aeroengine applications Powder Metallurgy 6 32 1995
- Li, H Yuan, B Gao, Y Chung, CY Zhu, M Journal of Materials Science 44 875 881 2009
- Mitkov, M. Bozic, D. Hydride-dehydride conversion of solid Ti6Al4V to powder form Materials Characterization 37 53 60 1996
- do Nascimento Filho, E. Henriques, V.A.R. de Oliveira, J. Diniz, E.F. Techniques for Ti-6Al-4V Production by Powder Metallurgy SAE Technical Paper, 2011-36-0040 2011 10.4271/2011-36-0040
- Froes, F.H. Mashl, S.J. Moxson, V.S. Hebeisen, J.C. Duz, V.A. The Technologies of Titanium Powder Metallurgy Journal of Metals 15 46 48 2004
- Bao-guo, YUAN Chun-feng, LI Hai-ping, YU Dong-li, SUN Effect of hydrogen content and stress state on room-temperature mechanical properties of Ti-6Al-4V alloy Transactions os Nonferrous Metals Society of China 19 423 428 2009
- German, R. M. Sintering, Theory and practice John Wiley & Sons 1996