Niobium tungsten hafnium alloy

Niobium alloy formed by adding a certain amount of tungsten and hafnium to the niobium base. It is developed on the basis of niobium-tungsten alloy. With the increase of tungsten content, the strength of niobium alloy increases, the plastic-brittle transition temperature increases, and the weldability and coating property deteriorates. Adding a certain amount of elements such as hafnium and yttrium into niobium alloy can improve the coating property and welding property of the alloy, reduce the plastic-brittle transition temperature and increase the creep strength. In 1962, the United States successfully developed Nb-10W-10Hf alloy, and later developed Nb-10W-10Hf-0.1Y alloy. Niobium-tungsten-hafnium alloy can be divided into solid solution-strengthened alloy and dispersion-strengthened alloy.

Preparation of niobium/hafnium alloy ingots are usually prepared by electron beam melting and vacuum consumable arc melting. Then extruding and forging at 1200℃ or above, rolling and drawing at 500℃ or below, bar, plate, wire, pipe and other products can be prepared. Cutting, welding, coating, heat treatment and other similar to niobium alloy.

Niobium, tungsten and hafnium alloy can be used to manufacture the space shuttle, missile, space power generation system parts and conduit which work under 1645℃ for a long time.