Physical Metallurgy Basis for Achieving 300-KSI Strength in Transage Titanium Alloys.
Final rept. 14 Oct 71-14 Aug 73,
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CALIF PALO ALTO RESEARCH LAB
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ICS IN BETA-ANNEALED AND ALPHA-BETA-ANNEALED CONDITIONS. Thin-foil electron transmission was the principal metallographic means because the athermal martensite of these alloys is of the order of 10 A in thickness. The alloys undergo stress induced transformation in the annealed condition and possibly they experience this phenomenon in some age hardened conditions. The annealed conditions were starting states for thermomechanical treatment TMT studies for achieving 300-ksi strength. The strength goal seemed inherent in a number of the combinations of alloy and TMT schedule. Confirmation of the strength goal was not realized due to deficiencies in test specimens design and condition, and in the quality of machining. The fracture surfaces suggest that the materials have sufficient ductility to demonstrate the yield strength goal of 300-ksi. Author
- Properties of Metals and Alloys