Effect of heat treatment on the mechanical properties of ultrafine-grained aluminium

The paper presents the results of experimental studies of mechanical properties of ultrafine-grained aluminum with a grain size of 700±200 nm resulting from the intensive plastic deformation by torsion of technical aluminum AD1 in combination with different modes of heat treatment. It is shown that microhardness and tensile strength of fine-grained material exceed the values of microhardness and tensile strength of the material as supplied more than two times and the elongation is reduced more than twice. It is noted that various modes of annealing after the intensive plastic deformation by torsion can lead to embrittlement of the material and increase its ductility.