Development of Ultrahigh-Strength, Ductile Titanium Alloys by Thermomechanical Processing and Transformation-Induced Plasticity.
Final rept. 1 Mar 72-31 May 73,
STANFORD RESEARCH INST MENLO PARK CALIF
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This report summarizes the results obtained during the third year of a program aimed at the development of high strength titanium alloys showing enhanced ductility and toughness due to the occurrence of deformation-induced phase transformation. Binary alloys of titanium with the beta-eutectoid solutes iron, manganese, and chromium were investigated during the first half of this program. The second half of the program was devoted to an investigation of the deformation-induced transformation behavior and mechanical properties of alloys based on Transage 129 Ti-2Al-11V-2Sn-11Zr. Marked transformation-induced plasticity TRIP behavior was observed for the experimental alloys in a beta-annealed condition, especially when the VAl content ratio was reduced below 5.5. When the alloys were aged to increase the yield strength the TRIP behavior disappeared, although deformation-induced transformation still occurred in some instances. The reasons for this behavior are discussed in the report and it is concluded that a high yield strength and TRIP behavior are mutually exclusive in these alloys, since both depend on the same strengthening mechanism. Modified author abstract
- Properties of Metals and Alloys