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AEROVAL TI-GR5 - 2 Pages

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Catalogue excerpts

TI-GR5 is the most frequently used Ti - Alloy because of its excellent strength-to-weight ratio which makes it particularly suitable for aerospace applications where also a good combination of mechanical properties up to approximately 400°C, formability, weldability and toughness is a mandatory engineering requirement. The alloying elements influence the temperature at which the cristallographic transformation (p-Transus) from Alpha (a) phase (HCP) to the Beta (P) phase (BCC) occurs. The nominal 6,0% of Aluminium (an a-phase stabilizer element) contributes to strengthen the low temperature a-phase by solid solution; nominal 4% Vanadium (a p-phase stabilizer element), although exceeding the a-solubility limit at any temperature, confers heat-treatment capability allowing the achievement of consistent strengthening. MELTING PRACTICES Multiple melted Ti - Alloy with at least final melting cycle under vacuum. The outstanding set of properties of this alloy make it the first choice for the manufacturing of structural parts, aeroengine components and fastening systems. Among the variety of possible aerospace applications of TI-GR5 we find blades and discs for jet engines, landing gears, fasteners, airframe components, space vehicles and structures, missile components. TI-GR5 is used where the device is manufactured starting from annealed full section long products as machined wire-rod or bars in different profiles and sizes. Some among the possible finished products obtainable are pivots, rivets and screws along with a wide range of forged and/or machined components. CORROSION AND OXIDATION RESISTANCE The excellent corrosion resistance of titanium alloys results from the formation of very stable, continuous, highly adherent, and protective surface oxide films. Because titanium metal itself is highly reactive and has an extremely high affinity for oxygen, these beneficial surface oxide films form spontaneously and instantly when fresh metal surfaces are exposed to air and/or moisture. In fact, a damaged oxide film can generally reheal itself instantaneously if at least traces of oxygen or water are present in the environment. However, certain anhydrous conditions in the absence of a source of oxygen may result in titanium corrosion, because the protective film may not be regenerated if damaged. (*) Acciaierie Valbruna SpA supplies material in bar form only in the Annealed condition

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