Introduction to molybdenum alloys

Molybdenum alloy is a non-ferrous alloy composed of molybdenum as the matrix and adding other elements. The main alloying elements are titanium, zirconium, hafnium, tungsten and rare earth elements. The elements of titanium, zirconium and hafnium not only play a solid solution strengthening effect on the molybdenum alloy and maintain the low-temperature plasticity of the alloy, but also can form a stable and dispersed carbide phase to improve the strength and recrystallization temperature of the alloy. Molybdenum alloy has good thermal conductivity, electrical conductivity and low expansion coefficient. It has high strength at high temperature (1100～1650℃) and is easier to process than tungsten. It can be used as the grid and anode of the electron tube, the support material of the electric light source, and used to make die-casting and extrusion molds, and the parts of spacecraft. Because molybdenum alloy has low temperature brittleness and welding brittleness, and high temperature is easy to oxidize, its development is limited. Industrially produced molybdenum alloys include molybdenum-titanium-zirconium, molybdenum-tungsten, and molybdenum rare-earth alloys. The first type is the most widely used molybdenum alloy. The main strengthening methods of molybdenum alloys are solid solution strengthening, precipitation strengthening and work hardening. Through plastic processing, molybdenum alloy plates, strips, foils, pipes, bars, wires and profiles can be prepared, and its strength can be improved and low-temperature plasticity can be improved.