Paper Title:
Aero-Engine Titanium from Alloys to Composites
  Abstract

The aero-engine has provided the major drive for the development of new improved titanium alloys in recent years. This paper covers these developments from the workhorse alloy Titanium 6/4 and it’s higher temperature stable mates through to the more exotic intermetallic materials and on to their reinforcement with ceramics. The use of Ti6/4 alloy is now widespread throughout the aero space industry providing a good combination of strength at moderate temperatures (~300°C) a relatively low density and a wide range of processing options ranging from castings to forgings to powder HIP and diffusion bonding. Alloy development for the aero-engine essentially concentrated on either increasing the temperature capability and creep resistance or increasing the strength at intermediate temperatures. Alloys such as Ti 6242 and IMI 834 were aimed at compressor disc applications with operation up to around 600°C. Improvements resulted from compositional control and thermal processing to optimize the microstructure for creep and fatigue. High strength intermediate temperature capability (~500°C) alloys were also developed (Ti6246) where higher levels of molybdenum balance the alpha strengthening additions. The drive for lighter weight led to the development of titanium intermetallic systems. Alloys such as 45-2-2XD and Alloy 7 have been the subject of much research and manufacturing development over the last 20 years, demonstrating that they are capable of operating at temperatures well above those of conventional titanium. More recently, alloys with higher additions of Nb and Ta have shown improved mechanical properties and offer promise to extend the application of TiAl above 700°C. In parallel with intermetallic developments combining titanium alloys with the extreme high strength of ceramic fibres has proved irresistible and many ways to produce titanium composites have been developed. The majority of application development has focused on Ti6/4 alloy as the matrix although other matrix alloys have been investigated and tested in U.S. engine demonstrators. Recently a combination of Ti-22Al-26Nb disks reinforced with orthorhombic MMC ran for over 100 hours in an engine test. However, none of these niche composite systems has yet made the transition into large volume production and the fibre reinforced Ti6/4 system probably offers the greatest potential for implementation. The main barrier to the take up of both advanced intermetallics and titanium composites is the cost of raw materials and processing. The challenge still exists to produce net shape components and provide weight savings at an acceptable cost. This will be the key to future exploitation.

  Info
Periodical
Materials Science Forum (Volumes 618-619)
Edited by
M.S. Dargusch & S.M. Keay
Pages
127-134
DOI
10.4028/www.scientific.net/MSF.618-619.127
Citation
P. Doorbar, M. Dixon, A. Chatterjee, "Aero-Engine Titanium from Alloys to Composites", Materials Science Forum, Vols. 618-619, pp. 127-134, 2009
Online since
April 2009
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Ming Bo Yang, Fu Sheng Pan, Jing Zhang, Jin Zhang
Abstract:The current status of research and application in the AZ(Mg-Al-Zn), AS(Mg-Al-Si), AE(Mg-Al-RE), AX(Mg-Al-Ca), ACM or MRI(Mg-Al-Ca-RE)and...
923
Authors: P.Y. Li, W. Li, X.L. He, Sheng Long Dai, S.Y. Wang, H.Q. Li, H.T. Yang
Abstract:Large extrusion and forgings of Al-9Fe-1.9Mo-1.7Si (wt.%, FMS0918) aluminum alloy for elevated temperature applications were produced by...
1077
Authors: Trevor Sawatzky, Dong Yi Seo, H. Saari, D. Laurin, Dae Jin Kim, Young Won Kim
Abstract:The microstructure and creep properties of two powder metallurgy (PM) ‘beta gamma’ titanium aluminide alloys are presented. Alloy powders...
500
Authors: Rupa Dasgupta, Satyabrata Das, Amol Kumar Jha
Friction and Wear in Material Processing
Abstract:Metal Matrix Composite made from Al-7075 based alloy dispersed with 10% SiC particles through the liquid metallurgy route were evaluated for...
555
Authors: Xin Nan Wang, Yue Fei, Xiao Hu Zhou, Zhi Shou Zhu, Jun Li, Guo Qiang Shang, Li Wei Zhu
Abstract:The evolution regularities of microstructure and property of a new metastable β titanium alloy with different solution treatment and aging...
932