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Author: F.C. Campbell, Editor | Document Download | Product code: ZEMEA2008P527
File size: 606 KB
Classified as: Titanium
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The primary advantages of titanium alloys are their combination of relatively low densities, high strengths, and excellent corrosion resistance. With a density of 4.5 g/ cm3 (0.16 lb/in.3), titanium is classified as a light metal and is only approximately half as heavy as steel and nickel-base superalloys. Yield strengths vary from 480 MPa (70 ksi) for some grades of commercial titanium to approximately 1100 MPa (160 ksi) for structural alloys. In addition to their static strength advantage, titanium alloys have much better fatigue strength than the other lightweight alloys, such as those of aluminum and magnesium. Titanium alloys can be used at moderately elevated temperatures, as high as 370 to 595 °C (700 to 1100 °F), depending on the specific alloy. In addition, some alpha titanium alloys, especially the low interstitial grades, can be used in cryogenic applications because they do not exhibit a ductile-to-brittle transition. As a result of their attractive combination of properties, titanium alloys are used extensively in aerospace for both airframe and engine components. For example, titanium alloys comprise approximately 42% of the airframe weight of the new F-22 fighter aircraft. In commercial passenger aircraft engines, titanium alloys are used for the fan, the low-pressure compressor, and approximately 2/3 of the high-pressure compressor.
- From: Elements of Metallurgy and Engineering Alloys (ASM International)
- Published: June 01, 2008
- Pages: 19
- Review Type: Peer reviewed
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Metals and Alloys | Titanium