INVESTIGATION OF THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Cu/Al MULTILAYER FABRICATED BY SEVERE PLASTIC DEFORMATION.

High speed high pressure torsion (HS HPT) is proposed as a novel method to produce metal matrix multilayer composites. The HS HPT technique derivate from traditional High pressure torsion (HPT), which is the most widely used in exertion of severe plastic deformation on bulk metallic samples. HS HPT involves combination of high pressure with torsional straining but differs from the classical method through implementation of an elevated rotation speed of superior anvil and slippage between sample and anvils. The process is kindred to steer friction. Therefore, HS HPT is not only able to produce ultrafine grained and nanostructured disks, cones or rings but also may produce the bonding, too. In experiments was used a typical bimetal system Al/Cu. The composites have 2, 3, 5, 7, 9 and respectively 11 layers. The manufacturing process of Al/Cu multilayers and its effects on microstructure and mechanical properties of Al/Cu composites was studied. Vickers microhardness were conducted to investigate the Al and Cu layers and joint effectiveness, according to the increasing number of layers. The experimental results confirm the method HS HPT as having real potential in gaining multilayer metallic nanocomposites. [ABSTRACT FROM AUTHOR]