Molybdenum-rhenium Alloy Foil

Molybdenum-rhenium alloy is an alloy composed of molybdenum as base element and rhenium as alloying element. The alloy presents a rhenium effect to improve plasticity, and the rhenium content in the alloy is generally 11% to 50%(mass fraction).

Refractory metal molybdenum not only has excellent thermal conductivity, electrical conductivity, corrosion resistance, but also has a low coefficient of thermal expansion, high hardness, good high temperature strength, so molybdenum in the electronics industry, aerospace industry, energy industry and other fields have a wide range of uses. However, the pure metal molybdenum is relatively brittle at room temperature, poor processing performance, poor welding performance, easy oxidation, with recrystallization brittleness and other points, all of which limit the application of pure metal molybdenum. Adding a certain amount of alloying elements such as C, B, K, Si, Al, Re and rare earth elements is an effective way to improve the brittleness of metal molybdenum. Among them, the role of alloying element rhenium is the most prominent, the addition of rhenium element, not only can improve the room temperature performance of molybdenum, welding performance, but also can improve the high temperature performance of molybdenum.

Since it was found that Mo50Re alloy has better plasticity and strength than molybdenum in 1955, many researchers have carried out detailed and in-depth research on the microstructure properties and processing technology of molybdenum rhenium alloy. In the early research, Russian Savitsky made a significant contribution to his own research results in his monograph. Davidson et al. systematically studied the elastic constants of molybdenum-rhenium alloys.

In recent years, molybdenum-rhenium alloys have been prepared by the powder metallurgy method of medium temperature sintering by Garin et al., and then Mannheim et al have studied the work-hardening phenomenon of the alloys. Todd et al. studied the mechanical properties and microstructure of various molybdenum-rhenium alloys. Bernd et al. focused on the high temperature fatigue properties of molybdenum-rhenium alloys. Because of the high price of rhenium, Xing Yinghua et al. systematically studied the effect of adding a small amount of rhenium on the microstructure properties of molybdenum. Molybdenum-rhenium Alloys produced by Rhenium Alloys,Inc., include molybdenum-rhenium alloy powders, wires, sheets, tubes and rods. Its main components are Mo41Re, Mo44.5Re and Mo47.5Re. But because rhenium is expensive, in recent years many researchers have focused on alloys with low rhenium content.

The study of molybdenum-rhenium alloy Mannheim et al. showed that no obvious cracks were found in powder metallurgy MO25Re and Mo50Re alloy ingot after 25% deformation at room temperature. It has also been reported that molybdenum rhenium alloy ingot containing 35% Re can deform more than 90% at room temperature without cracking. Nevertheless, the opening of molybdenum rhenium alloy is generally selected for hot processing, the deformation temperature of the initial pass is greater than 1400℃, and the deformation rate is greater than 20%. Molybdenum-rhenium alloys after opening are generally processed in cold or even at room temperature. Recrystallization annealing is carried out when the total deformation rate reaches 50%~90%.

Mechanical properties - elastic properties of molybdenum rhenium alloys
Pure rhenium has an elastic modulus second only to osmium, with a value of 468 GPa, and pure molybdenum has an elastic modulus of 330 GPa. The elastic modulus of molybdenum rhenium alloy is between the two. When the rhenium content is less than 52%, the Young's modulus, shear modulus and Poisson's ratio increase with the increase of rhenium content. When the rhenium content reaches 43%, Young's modulus and shear modulus have a maximum value. The rhenium element can change the anisotropy of molybdenum alloy, with the increase of rhenium content, the elastic constant in the direction of (100) decreases, while the elastic constant in the direction of (110) and (111) increases, when the rhenium content is 50%, the molybdenum rhenium alloy behaves as isotropy, and the elastic constant is the same in different directions.

Mechanical properties of molybdenum-rhenium alloys - strength and elongation
Rhenium can not only improve the strength of molybdenum at room temperature and high temperature, but also improve the plasticity of molybdenum. The tensile strength of pure molybdenum at room temperature is about 650 MPa, and the tensile strength of molybdenum rhenium alloy with high rhenium can reach more than 1000MPa. The elongation of pure molybdenum at room temperature is 0, and the elongation of molybdenum-rhenium alloy can reach more than 20%. At 1473 K, the tensile strength of Mo47.5Re is 230 MPa and the elongation is 8%, while the tensile strength of pure molybdenum is only 100 MPa. With the increase of rhenium content, the stress factor and hardening index increase, but the stress factor of molybdenum-rhenium alloy is much smaller than that of pure rhenium. Therefore, the work hardening phenomenon of molybdenum rhenium alloy is much smaller than that of pure rhenium, and the processing performance of molybdenum rhenium alloy is better than that of pure rhenium.

Molybdenum rhenium alloys Mechanical properties of molybdenum rhenium alloys - creep properties
The high temperature creep property is an important index to measure the high temperature property of metals. Bernd et al have done work on various components of molybdenum-rhenium alloys at 1600℃, 25 MPa. Compared with other molybdenum-rhenium alloys, Mo51Re alloy has higher plasticity and higher creep rate, so its fracture time is shorter.

Molybdenum rhenium alloy application
Molybdenum rhenium alloy can be used as high-speed rotating X-ray tube target material, microwave communication long life grid plate, space reactor core heating tube, high temperature furnace heating element, high temperature thermocouple and so on. The tensile strength and ductility resistivity of molybdenum-rhenium alloys at room temperature increase with the increase of rhenium content. Mo-5%Re and Mo-41%Re are usually used as thermocouple wire materials for aerospace structural materials. Mo-50%Re is used as high temperature structural material.

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