Titanium alpha-beta

W. J. Evans. Optimising mechanical properties in alpha + beta titanium alloys. Mater Sci Eng A 243 %%, 1998. 

Silicon oxide (SiO) Strontium oxide (SrO) Strontium oxide (SrO) Strontium oxide (SrO) Strontium oxide (SrO) T talum oxide (TaO) Titanium oxide, alpha (TiO) Titanium oxide, beta (TiO) Titanium oxide (TiO)... 

It is shown here that alpha, beta and alpha-beta titanium alloys can be friction stir welded. The phase transformations that occur in the nugget region and the heat affected zone are discussed. Residual stresses were found to be quite high in the present work. Tensile properties in transverse direction were... 

DUW] Duwez, P., Effeet of rate of cooling on the alpha-beta transformation in titanium and titanium molybdenum alloys, Trans. Metall. Soc. AIME, 191, (1951), 765-771. Cited on page 82. 

Many different titanium alloys have been developed for a large variety of applications. Titanium alloys are generally classified according to the equilibrium phases present in their microstructure at room temperature (Ref 1). They can be classified as commercially pure (CP) alloys and alpha alloys that mainly contain the hep phase, alpha-beta alloys that contain both phases, and metastable beta alloys and beta alloys that consist largely of the bcc phase. 

Industrial grades of pure titanium have relatively low tensile strength in comparison to alpha-beta stabilized alloys such as Ti6A14V. Therefore, the majority of industrial uses for titanium incorporate the alpha-beta alloys and as such these are the focus of most adhesion studies.As with other metals, there is a large range of pre-treatments available for titanium and its alloys, as indicated in Table 1. 

Metallurgical classification. The crystallographic structure of titanium exhibits a phase transformation from a low-temperature close-packed hexagonal arrangement (i.e., a-hcp, alpha-titanium) to a high-temperature form body-centered cubic crystal lattice (i.e., 6-bcc, beta-titanium) at 882°C. This transformation can be considerably modified by the addition of alloying elements (Table 4.52) to produce at room temperature alloys that have all alpha, all beta, or alpha-beta structures. 

Layered titanium phosphates have many potentially important applications in ion exchange, catalysis, intercalation, and sorption. Characterization of metal local environments by solid-state " /" Ti NMR has been difficult. In this work, the local structures around Ti in several representative layered systems, including alpha-, beta-, and gamma-TiP have been characterized, by examining the static NMR spectra of these ma-... 

Precautions in Use. Like most titanium alloys with alpha-beta microstructure, Ti-621/0.8 is susceptible to hydrogen embrittlement in hydrogenating solutions at room temperature, in air or reducing atmospheres at elevated temperatures, and even in pressurized hydrogen at cryogenic... 

Source R.E. Lewis et al., The Elevated Temperature Ductility Dip Phenomenon in Alpha, Near-Alpha, and Alpha-Beta Alloys, Titanium, Science and Technology, Vol 2, G. Lowering, U. Zwicker, and W. Bunk, Ed., Deutsche Gesellschaft fur Metallkunde, Gemnany, 1985, p 895-902... 

The modulus of IMI 829 is typical of other high-aluminum, near-alpha alloys and is therefore somewhat Ngherthan alpha-beta alloys. Source IMI Titanium High-Temperature Alloys brochure... 

F) (see figure). Crack propagation resistance is superior to that of typical alpha-beta titanium aUo3rs. 

G.W. Kuhlmanef oZ., "Characterization of Ti-6-22-22S AHigh-Streng Alpha-Beta Titanium Alloy for Fracture Critical AppKcations, Proc. 7th Lot. Titanium Conf, San Diego, TMS/AIME, June 1992, to be published... 

Note Forgings were processed at 30 °C (50 °F) above the P transus temperature, 30 min, fan cooled+40 °C (70 °F) below the P transus, 1 h, AC + 540 °C (1000 °F), 8 h. Source G.W. Kuhlman et aL, "Charactmization ofTi-6-22-22S High-Strength Alpha-Beta Titanium Alloy for Fracture Critical Applications, Proc. 7th Int. Titanium Conf., San Diego, TMS/AIME, June 1992, to be published... 

Close-dte forgings processed as noted, n=0.1, s 3.0,30 Hz. Source Characterization of H-6-22-22S A High-Strength Alpha-Beta Titanium Aloy for Fracture Critical AppKcattorte, Proc. 7lh InL Titanium Conf., Sen Diego, TMS/AIME, June 1992, to be pubished... 

Developed for use in the aerospace industry, Ti-10-2-3 combines many of the advantages of the metastable beta titanium alloys without sacrificing certain inherent alpha-beta characteristics. It shows excellent hardenabihty in section sizes up to 125 mm (5 in.), but also demonstrates good short-... 

DA Meyn, Effect of H3 irogen on Fracture and Inert-Environment Sustained Load Cracking Resistance of Alpha-Beta Titanium Alloys, Metall. Ty-ans., Vol 5, Nov 1974, p 2405... 

Because alpha-beta alloys are two-phase alloys, they are the most common and the most versatile of the three types of titanium alloys. Phase compositions, sizes, and distributions can be manipulated by heat treatment (see Table 1) within certain limits to enhance a specific property or to attain a range of strength levels up to moderate thicknesses. 

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