Deformation and Decomposition of Metastable B.C.C. Titanium Alloys.
Final rept. 1 Jun 71-31 Dec 75,
ROCKWELL INTERNATIONAL THOUSAND OAKS CALIF SCIENCE CENTER
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The effect of microstructure on mechanical properties of metastable beta titanium alloys was investigated, with emphasis on the influence of alpha-phase precipitation on tensile strength and ductility. A commercial alloy, Ti-3Al-8V-6Cr-4Mo-4Zr Beta-C has been aged to produce both Type 1 alpha obeying the Burgers orientation relation and 2 alpha not obeying the Burgers relation as hardening precipitates in the beta matrix. Although a direct comparison of Types 1 and 2 alpha could not be made, there did not seem to be any direct correlation between precipitate type and mechanical properties. Rather, it has been found that overaging to produce a coarse distribution of relatively large 1000 A non-coherent alpha precipitates provides the best combination of strength and ductility. The same strength can be achieved with much finer distribution of small approximately 100-200 A coherent alpha precipitates, but with much reduced ductility.
- Properties of Metals and Alloys