Diversity of Different Atomic Groups in the Cu-NbTi Composite under the Influence of Batch Hydroextrusion

Using X-ray diffraction analysis, the patterns of changes in the atomic structure in Cu-NbTi composite materials were studied at =50 atm, with a moving Poisson rotation speed of 0.5 rpm. and rotation speed =(0-5) rpm. as a result of the action of batch hydroextrusion on the samples. It was found that the samples contain different-sized structural formations with long-range, mesoscopic and short-range atomic order. It is shown that the non-monotonic change in atomic order, with an increase in the number of revolutions of rotation of the mobile Poisson, is due to the structural phase transition of order-disorder into a state with the formation of different-sized atomic groups with long-range, mesoscopic and short-range atomic order, in which the manifestation of new interatomic interaction forces characterizing the formation of intermetallic clusters of atomic groups. It was found that already in the initial state after compacting the samples, the presence of clusters in the copper matrix phase containing niobium and titanium is observed, which characterizes an increase in heterophase in the sample system under study. The result is a homogeneous finely dispersed material containing uniformly distributed multi-scale fractions of metallic and intermetallic phases in the form of crystalline, mesoscopic and amorphous fractions. This structure exhibits increased strength, which is noticeable in the form of an increase in microhardness from 1.56 GPa to 4.15 GPa.