Residual mechanical properties of Ti-6Al-2Sn-4Zr-2Mo after simulated Space Shuttle reentry

Oxidation and embrittlement are concerns in use of titanium foils for shielding advanced space transportation system vehicles during earth reentry. Ti-6Al-4V in 0.003 in. and 0.035 in. thicknesses were exposed to multiple cycles of simulated space transportation system ascent/reentry conditions at temperatures ranging from 1000 F to 1200 F. Residual mechanical tests and metallurgical analyses were made on the specimens after exposure. Results show that tensile elongation is the mechanical property most affected by the reentry environment. Results are presented to show a comparison of residual properties of foil specimens from static oxidation exposure and cyclic oxidation exposure.