Deformation Nano-Mechanisms Occurring on the Interface of Dissimilar Materials Joined in Solid Phase by Means of High Temperature Rolling

Abstract

Nano-mechanisms of crystal lattice deformation on the interface of dissimilar materials (Cu-Nb), joined by vacuum rolling in solid phase under high temperature (950˚C) were studied by means of high resolution electron microscopy. Input of carriers of rotation modes-nano-dipoles of partial disclinations and nano-twist disclinations in the form of double spirals in deformation mechanisms were analyzed. The role of these mechanisms in decrease of shear stability of the interface areas and in production of high-quality rolled metal is discussed.

Changes in the Structure and Properties of the Cu-Pb Composites Interface Jointed in the Solid Phase

“…If in paper [17], deformation value was equal to many hundreds of percents, but in paper [18], it was only several tens of percents, where by means of high-resolution electron microscopy, two new types of deformation nano-defects of rotation type were discovered, formed on the interface of dissimilar materials, joint by high-temperature rolling in vacuum. Similar to defects presented on Figure 7, they can also bring input into mass-transfer through the interface of the metals joined by high-temperature rolling.…”

Wave Processes and Mass Transfer on the Copper-Stainless Steel Interface under Solid Phase Bonding by High-Temperature Rolling

“…In the last years, NSC KIPT has studied the areas of interface of Cu-Nb and Cu-Pb [1] [2] systems bonded by high-temperature vacuum rolling in solid phase. On results of this study the following deformation nano-deffects and processes were discovered, indicating the presence of the hydro-dinamic and rotation modes of deformation: "wave front" and dynamic nano-crystallisation, nano-dipoles of partial disclinations, and nano-dipoles of rotation disclinations.…”