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Titanium beta alloys

Dr. Dmitri Kopeliovich

Titanium β-alloys are titanium alloys rich of β-phase due to the presence of substation amount of β-phase stabilizers: molybdenum (Mo), vanadium (V), tungsten (W), tantalum (Ta), silicon (Si). β-phase stabilizers prevent β-α transformation at high cooling rates of [Basic principles of heat treatment#Hardening|quenching]].

Content of α-phase stabilizers (aluminum) in titanium β–alloys is lower, than in α- and α-β alloys.

Titanium β-alloys are heat-treatable. They may be significantly strengthened by precipitation hardening. Solution treatment of β-alloys causes transformation of α-phase, which is stable at room temperature, to β-phase, which is stable at temperatures above the Beta Transus. Quenching suppresses β-α transformation.

The metastable β-phase partially transforms to fine precipitation particles of α-phase during aging.

The precipitation treatment results in increase of mechanical strength and decrease of ductility.

Titanium β-alloys, containing at least 10% of chromium (Cr), possess increased burn resistance and are used in aircraft engines at temperatures up to 950ºF (510ºC).

β –alloys are heat-treatable to very high strength and have good hot formability.

Ductility and fatigue strength of the alloys in heat-treated conditions are low.

Titanium β-alloys are normally supplied in solution-treated condition.

Titanium β-alloys are used for manufacturing aerospace components, high-strength fasteners, torsion bars, high-strength aircraft sheets, burn-resistant aircraft engine parts.

Chemical compositions of some titanium beta-alloys

Designation O,% V,% Fe,% Al,% Mo,% Cr,%
Ti-10V-2Fe-3Al 0.13 max. 9-11 1.6-2.2 2.6-3.4 - -
Ti-15V-3Cr-3Sn-3Al 0.13 max. 14-16 0.3 max. 2.5-3.5 - 2.5-3.5
Ti-4.5Fe-6.8Mo-1.5Al 0.15 - 4.5 1.5 6.8 -

(Concentration of nickel - balance)

Properties of some titanium beta alloys

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titanium_beta_alloys.txt · Last modified: 2023/12/13 by dmitri_kopeliovich
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