Molybdenum Rhenium Alloy is an alloy composed of metal molybdenum as matrix element and alloying element rhenium. The alloy exhibits a rhenium effect that enhances ductility. The rhenium content in the alloy is generally 11% to 50% (mass fraction).

The refractory metal molybdenum not only has excellent thermal conductivity, electrical conductivity, and corrosion resistance, but also has a low thermal expansion coefficient, high hardness, and good high temperature strength. the use of. However, pure molybdenum is relatively brittle at room temperature, has poor processability, poor weldability, easy oxidation, and has recrystallization brittleness, all of which limit the application of pure molybdenum. Adding a certain amount of alloying elements such as C, B, K, Si, Al, Re and rare earth elements is an effective method to improve the brittleness of molybdenum. Among them, the role of alloying element rhenium is the most prominent. The addition of rhenium element can not only improve the normal temperature performance and welding performance of molybdenum, but also improve the high temperature performance of molybdenum.
The preparation of Molybdenum Rhenium Alloy ingots generally adopts the methods of powder metallurgy and vacuum melting. When the content of rhenium is lower than 29%, the α phase of body-centered cubic structure is formed by solid solution of rhenium in molybdenum, and the lattice constant of molybdenum decreases. When the rhenium content is higher than 29%, the X phase and the σ phase are formed. The melting point, thermal properties and electrical properties of Molybdenum Rhenium Alloy are between those of pure molybdenum and pure rhenium. Rhenium can increase the recrystallization temperature of molybdenum and reduce its plastic-brittle transition temperature. Rhenium can not only improve the strength of molybdenum, but also greatly improve its plasticity. The work hardening rate of Molybdenum Rhenium Alloy is between pure molybdenum and pure rhenium and close to pure molybdenum.
A molybdenum alloy with 2% to 5% rhenium added to the molybdenum base. The addition of rhenium to molybdenum can improve the plasticity of molybdenum and the strength of molybdenum, which is a solid solution strengthening alloy. Adding 35% rhenium to molybdenum, the rolling deformation at room temperature can reach 90%. Molybdenum Rhenium Alloy is produced by powder metallurgy. Mo-Re alloys can be used as high-speed rotating X-ray tube targets, long-life grid plates for microwave communication, space reactor core heating tubes, high-temperature furnace heating elements, and high-temperature thermocouples. The room temperature tensile strength, ductility and resistivity of Molybdenum Rhenium Alloy increased with the increase of rhenium content. Mo-5%Re and Mo-41%Re are usually used as thermocouple wires for structural materials in aerospace. Mo-50%Re is used as high temperature structural material.
The effect of rhenium on molybdenum: rhenium can form MoReO4 type compounds with molybdenum, which is different from MO2 type compounds and does not infiltrate grain boundaries; rhenium can improve the solubility of C and O, so that carbides and oxides are difficult to precipitate; Molybdenum Rhenium Alloy is in Twin deformation occurs during low temperature deformation, which is different from pure metal molybdenum; rhenium changes the electronic structure of molybdenum, reduces the direction of atomic bonds, reduces stacking fault energy, and increases shear modulus.