Importance of Slip Mode for Dispersion-Hardened Beta Titanium Alloys
Final rept. 1 Oct 1971-31 Mar 1972
RUTGERS - THE STATE UNIV NEW BRUNSWICK NJ MATERIALS RESEARCH LAB
Pagination or Media Count:
The mechanical properties of Ti-7 Mo-7 and Ti-7 Mo-16 Al in atomic per cent were correlated to the microstructure. The mechanical properties of the alloy with low aluminum content, consisting of alpha beta phases, were dependent on the size of the alpha particles. Small alpha particles functioned as typical hard agents in a dispersion-hardened system and the volume fraction of the particles controlled the ductility. Large alpha particles behaved like soft incoherent particles, the volume fraction having little effect on the inherent ductility of the alloy. This different behavior could be attributed to the dependence of strain-hardening behavior of alpha particles on particle size. The two-phase beta Ti3Al microstructure of the alloy with high aluminum content resulting from high-temperature aging at 900C exhibited a yield stress of 130 ksi and an elongation to fracture of 5. The ductility of these microstructures was controlled by the volume fraction of the Ti3Al particles inducing homogeneous slip.
- Properties of Metals and Alloys