Aerospace series. Titanium alloy TIP64001 (Ti-6Al-4V). Annealed. Sheet and strip, hot rolled. a 3L 6 mm

In the present study, the unique bimodal grain size distribution microstructure with the ultrafine substrate and embedded macro grains was fabricated by a traditional hot-rolling process in a novel low-cost Ti-2Fe-0.1B titanium alloy, which possesses a good combination of strength (around 663 MPa) and ductility (around 30%) without any post heat treatment. Meanwhile, the mechanical behavior and corrosion resistance of hot-rolled Ti-2Fe-0.1B alloy after equal channel angular pressing (ECAP) deformation were studied. Results indicated that the average grain size decreased to 0.24 μm after 4 passes ECAP deformation, which led to the enhancement of tensile strength to around 854 MPa and good ductility to around 15%. In addition, corrosion resistance was also improved after ECAP due to the rapid self-repairing and thicker passivation film. Our study revealed that the novel low-cost titanium alloy after hot-rolling and ECAP could be used instead of Ti-6Al-4V in some industrial applications due to similar mechanical behavior and better corrosion resistance.

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High Fugacity Hydrogen Effects in Beta-21S Titanium Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.1355 ◽

2007 ◽

Vol 546-549 ◽

pp. 1355-1360

Author(s):

Dan Eliezer ◽

E. Tal-Gutelmacher ◽

Lothar Wagner

Keyword(s):

Titanium Alloy ◽

Weight Ratio ◽

Thermal Desorption Spectroscopy ◽

High Strength ◽

Advanced Materials ◽

X Ray Diffraction ◽

Hydrogen Induced Cracking ◽

Second Phases ◽

Rolled Condition ◽

Hot Rolled

Beta-21S titanium alloy is ranked among the most important advanced materials for a variety of technological applications, due to its combination of a high strength/weight ratio, good corrosion behavior and oxidation resistance. However, in many of these technological applications, this alloy is exposed to environments which can act as sources of hydrogen, and consequently, severe problems may arise. The objective of this paper is to investigate the influence of high fugacity hydrogen on Beta-21S alloy in as-received (mill-annealed and hot-rolled) condition. Hydrogen effects on the microstructure are studied using X-ray diffraction and electron microscopy, while the absorption and desorption characteristics are determined respectively by means of a hydrogen determinator and thermal desorption spectroscopy. Preliminary results at room temperature revealed hydrogen-induced straining and expansion of the lattice parameters. However, neither second phases formation (hydrides), nor hydrogen-induced cracking, were observed after hydrogenation. The main characteristics of hydrogen absorption/desorption behavior, as well as hydrogen-induced microstructural changes in both microstructures are discussed in detail.

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