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Heat treatment of metastable beta titanium alloys involves essentially two steps,Äîsolution treatment in beta or alpha+beta phase field and aging at appropriate lower temperatures. High strength in beta titanium alloys can be developed via solution treatment followed by aging by precipitating fine alpha (Œ±) particles in a beta (Œ≤) matrix. Volume fraction and morphology of Œ± determine the strength whereas ductility is dependent on the Œ≤ grain size. Solution treatment in (Œ±¬†+¬†Œ≤) range can give rise to a better combination of mechanical properties, compared to solution treatment in the Œ≤ range. However, aging at some temperatures may lead to a low/nil-ductility situation and this has to be taken into account while designing the aging step. Heating rate to aging temperature also has a significant effect on the microstructure and mechanical properties obtained after aging. In addition to Œ±, formation of intermediate phases such as omega, beta prime during decomposition of beta phase has been a subject of detailed studies. In addition to covering these issues, the review pays special attention to heat treatment of beta titanium alloys for biomedical applications, in view of the growing interest this class of alloys have been receiving.
Strain rate effects for the high strength, metastable beta-titanium alloy Ti-8Mo-8V-2Fe-3Al are assessed in terms of tensile and fracture toughness behavior. It is shown that as the strain rate increases the yield strength, ultimate tensile strength, and ductility also increase. As a result of the decrease in the amount of intergranular fracture as the strain rate is increased, the dynamic fracture toughness values KId are greater than those obtained under static conditions as given by KQ.
Beta titanium alloys are one of the most rapidly developing areas of materials technology. As a group, beta alloys provide a wider range of processing, physical, chemical and mechanical properties than any other titanium alloys.
Proceedings of the Fifth International Conference on the Effect of Hydrogen on the Behavior of Materials sponsored by the Structural Materials Division (SMD) Mechanical Metallurgy and Corrosion & Environmental Effects Committees of The Minerals, Metals & Materials Society held at Jackson Lake Lodge, Moran, Wyoming, September 11-14, 1994.