PROBLEMS OF NANOSTRUCTURING OF BLANKS AND THEIR SOLUTION BY METHODS OF INTENSIVE PLASTIC DEFORMATION

Structural materials with ultrafine-grained (UFG) or nano- and submicrocrystalline structure significantly surpass materials obtained by traditional methods, such as casting and pressure processing, in a number of their mechanical characteristics (hardness, etc.). That is why such alloys (mainly alloys based on aluminum, magnesium, titanium) are in constant demand in industry, especially in space, aviation and shipbuilding. The main method for obtaining an ultrafine-grained metal structure is equal-channel angular pressing (ECAP), which is one of the methods of intense plastic deformation (IPD). In addition, there are a number of other methods, such as high-pressure torsion, accumulative roll gluing, the KOBO method and a number of others. Obtaining blanks from corrosion-resistant non-ferrous alloys by the listed methods is not always effective for industrial, mass production volumes, which is why the development and search for methods for obtaining an ultrafine-grained structure of materials continues. This article discusses methods for obtaining an ultrafine-grained structure of alloys, the advantages of these methods and their disadvantages. For aluminum alloy 6082, a method for obtaining a similar structure by rolling on a three-roll radial-shear mill is considered.