No other material is similarly suitable for aerospace use than titanium and its alloys. With a density of 4.5 g/cm3, Ti alloys are only about half as heavy as steel or Ni-based superalloys, and provide an excellent strength-to-weight ratio. Furthermore, they can be used at elevated temperatures and show good corrosion resistance. The use of titanium and its alloys in the arerospace sector is highlighted in the review article. In airframes, saving weight is the major reason for choosing titanium alloys in fuselage applications. Also, alloys such as Ti-3Al-2.5V are used for hydraulic tubing of modern aircraft. Where high corrosion resistance is required at moderate strengths, commerically pure titanium is used (for example in aircraft floors surrounding on-board kitchens and toilets). Compared with commercial aircrafts, the use of titanium is considerably higher in military fighter aircrafts due to larger thermal and mechanical loads and the supersonic speed. The main area of application for aerospace titanium alloys is the gas turbine engine. Compressor blades were the first engine components to be made from titanium, titanium compressor disks being introduced next. Since fan blades and disks are used at low temperatures, they are normally manufactured from Ti-6Al-4V. Elevated temperature near-alpha alloys are used in the high-pressure compressors with maximum temperatures of around 540 deg C. For the plug and other parts of the nozzle where aerospace hydraulic fluids lead to corrosion the beta-alloy TIMETAL 21S is used. For helicopters, titanium alloys such as Ti-6Al-4V and TIMETAL 10-2-3 are used in the most highly stressed component: the rotor head. In space applications, titanium is used due to its low density, high strength and long term chemical compatibility with fuel. Besides of Ti-6Al-4V and Ti-15-3, a new alloy Ti-3Al-2.5V was developed for low temperature applications such as the high-pressure piping in the hydrogen pumping systems of the US Space Shuttle.
Titanium alloys for aerospace applications
Anwendungen von Titanlegierungen in der Luft- und Raumfahrt
Advanced Engineering Materials ; 5 , 6 ; 419-427
2003
9 Seiten, 18 Bilder, 23 Quellen
Aufsatz (Zeitschrift)
Englisch
Titanlegierung , Titanaluminiumvanadiumlegierung , Dichte (Masse) , Korrosionsbeständigkeit , Flugzeugzelle , Gasturbine , Hubschrauber , Anwendung in der Luft- und Raumfahrt , Anwendung in der Wehrtechnik , Flugzeugrumpf , Hydraulikleitung , Flugzeugfahrwerk , Bläserverdichter , Übersichtsdarstellung , Rotor (Drehflügel)
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