tanB

TaNb is a binary alloy of tantalum (Ta) and niobium (Nb). It is typically described by its composition, with varying ratios of Ta to Nb, and is part of the broader class of refractory metal alloys. The two elements are chemically similar and form a continuous solid solution over much of the composition range, enabling fine-tuning of properties by adjusting the Ta/Nb ratio.

Properties: TaNb alloys exhibit very high melting points, good high-temperature strength, and excellent corrosion resistance in many aggressive media. They are notably ductile for refractory metals and can be relatively easy to cold- or hot-work. The bcc crystal structure of both constituents tends to form a homogeneous microstructure upon proper heat treatment. The presence of niobium lowers the density and can improve formability compared with pure tantalum.

Processing: Commercial TaNb materials are produced by vacuum arc remelting (VAR) or vacuum induction melting, followed by hot working and homogenization anneals to achieve a single-phase solid solution. Powder metallurgy routes are also used for complex shapes. An oxide layer (Ta2O5) forms on the surface and provides some corrosion protection.

Applications: TaNb alloys are used where high-temperature strength, corrosion resistance, and relatively low neutron activation are valuable. They find use in chemical processing equipment, reaction vessels, heat exchangers, crucibles, and components in nuclear or aerospace environments.

See also: Tantalum, Niobium, Nb-Ta alloy, refractory metals.