Tungsten Aluminum Alloy Preparation by High Current Pulsed Electron Beam

Tungsten aluminum alloys have excellent properties of both aluminium and tungsten, such as low density, high specific strength, high temperature resistance, corrosion resistance and easy processing. In addition to the advantages of aluminium and tungsten, aluminium-tungsten alloy also has the greatest feature of wear resistance, which can be well applied to golf clubs and ball heads, medical equipment components (breathing machines), automotive engine piston, hub and other components, and hopefully in the future to be applied to armor materials and aerospace engines and other fields.

(1)The preparation of alloy layer grinds and polishes 1060 pure aluminium substrates with specifications of 10 *10 *5 mm. The sand paper used is 400,800,1000,1200,1500,2000 mesh sandpaper, and the particle size of diamond polishing agent is 0.5 micron.

HCPEB irradiation was carried out on the surface treated pure aluminum matrix. According to the technical requirements of HCPEB equipment, the electron beam energy was 27 KeV, the energy density was 4J/cm², the target source distance was 15 cm, the vacuum P was less than 8*10-3Pa, and the beam spot diameter was 60 cm. The samples were irradiated 20 times.

(2) Analysis of Alloy Layer
The thickness of alloy layer is 10-13 micron, the thickness of remelted layer is 12-15 micron, XRD shows that the alloy phase is Al4W, and a small amount of Al5W. After 15 irradiations, OM shows that there are large unmelted tungsten particles on the cross-section of the sample, and there are large tungsten particles on the surface of the sample by SEM, which bind well with the matrix.

The above technical features are: firstly, a large number of defects are induced on the surface of the substrate by HPCEB irradiation, and then the Al-W alloy layer is obtained by pre-coating the tungsten powder and then irradiating with HCPEB, and the preparation method not only greatly improves the mutual solid solution metal. The degree of alloying of Al and W, and the utilization of metal tungsten, and the production cost of tungsten aluminum alloy are reduced. At the same time, the prepared Al-W alloy layer has a thickness of 10-15 μm, uniform distribution, continuous and compact, and has an ultrafine crystal nanostructure.

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