One of the Strongest Alloys -- Tungsten Rhenium Alloy

Rhenium is a rare metal element. It is located at the seventy-fifth place in the periodic table of elements, and is adjacent to tungsten (74). Rhenium is well known that its melting point is 3180 degrees, and it is second refractory metals.

In the field of alloys, tungsten and molybdenum are the most important elements that are combined with rhenium. Rhenium can increase the strength and plasticity of tungsten and molybdenum simultaneously. This phenomenon is called "rhenium effect". Adding a small amount of 3% to 5% rhenium can increase the starting temperature of tungsten recrystallization from 300 to 500 °C, and improve its high temperature strength and plasticity.

The formation of dissolved in tungsten rhenium in a BCC solid solution strengthening, so that the tungsten rhenium alloy has a series of excellent properties, such as high melting point, high strength, high hardness, high plasticity and high recrystallization temperature, high resistivity, low vapor pressure, low electron work and low plastic brittle transition temperature, it is one of the best comprehensive properties in tungsten alloy at present.

Tungsten rhenium alloy is mainly prepared by powder metallurgy and smelting method. Due to high yield and low cost of the alloy prepared by powder metallurgy, tungsten rhenium alloy is mainly produced by powder metallurgy. Tungsten rhenium alloy powder metallurgy process: pre-alloy powder preparation - compact - sintering - pressure processing.

Tungsten rhenium alloy can be processed into a plate, sheet, rod, used for high temperature structure of aerospace and aviation (nozzle, nozzle, heat insulation screen) and elastic elements and electronic elements and other important components, with the tungsten rhenium alloy are widely used, its performance requirements are increasingly high, the development of ultrafine / nano crystal tungsten rhenium alloy is gradually put on the agenda.

Rhenium is currently one of the most scarce strategic minerals in the world. The reserves in our country are only about 200 tons, mainly in the molybdenum mine, which is quite different from the world's first tungsten reserves. Rhenium is a good thing, but more than 200 tons for China's aerospace industry is only a drop in the bucket, and the price is very high, so if necessary, we should try to use tungsten alloy without rhenium or less rhenium.

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