The use of β titanium alloys in the aerospace industry |
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Authors: | R R Boyer R D Briggs |
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Affiliation: | (1) The Boeing Company, 98124 Seattle, WA |
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Abstract: | Beta titanium alloys have been available since the 1950s (Ti-13V-11Cr-3Mo or B120VCA), but significant applications of these
alloys, beyond the SR-71 Blackbird, have been slow in coming. The next significant usage of a β alloy did not occur until
the mid-1980s on the B-1B bomber. This aircraft used Ti-15V-3Cr-3Al-3Sn sheet due to its capability for strip rolling, improved
formability, and higher strength than Ti-6Al-4V. The next major usage was on a commercial aircraft, the Boeing 777, which
made extensive use of Ti-10V-2Fe-3Al high-strength forgings. Ti-15V-3Cr-3Al-3Sn environmental control system ducting, castings,
and springs were also used, along with Ti-3Al-8V-6Cr-4Mo-4Zr (β-C) springs. Beta-21S was also introduced for high-temperature
usage. More recent work at Boeing has focused on the development of Ti-5Al-5Mo-5V-3Cr, a high-strength alloy that can be used
at higher strength than Ti-10V-2Fe-3Al and is much more robust; it has a much wider, or friendlier, processing window. This,
along with additional studies at Boeing, and from within the aerospace industry in general will be discussed in detail, summarizing
applications and the rationale for the selection of this alloy system for aerospace applications.
This paper was presented at the Beta Titanium Alloys of the 00’s Symposium sponsored by the Titanium Committee of TMS, held
during the 2005 TMS Annual Meeting & Exhibition, February 13–16, 2005 in San Francisco, CA. |
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Keywords: | forgings Ti-10V-2Fe-3Al Ti-5Al-5Mo-5V-3Cr |
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