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.

(Concentration of nickel - balance)

(Materials Data)

• Titanium beta alloy Ti-10V-2Fe-3Al
• Titanium beta alloy Ti-15V-3Cr-3Sn-3Al
• Titanium beta alloy Ti-4.5Fe-6.8Mo-1.5Al

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• Classification of titanium alloys
• Commercially pure and low alloyed titanium alloys
• Titanium alpha and near-alpha alloys
• Titanium alpha-beta alloys

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