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

Abstract

Research of structure and properties of Cu-Pb-Cu composite interface, obtained by technology of pack rolling of the pair of mutually insoluble metals, was performed using the methods of metallography, micro-and nano-hardness, mechanical tests, energy-dispersion elementary analyses. The work was aimed at the analyses of possible mechanical mechanisms of mass-transfer, determining the hardness of metal joint in conditions of absence of inter-diffusion. It was shown that different intensity of mass transfer of copper and lead takes place through the composite interface, which corresponds to the results obtained on the other system of dissimilar materials-copper-niobium. Qualitative explanation of these patterns was offered on the basis of more intensive plastic flow of fusible compound of the composite in conditions of roll-bond joining.

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

“…At this, the penetration depth of copper in steel exceeds considerably the penetration depth of chrome, nickel, and iron in copper. Again it should be noted, that the same tendency-deeper penetration of more low-melting metal was indicated in the recent paper [2] on Cu-Pb system.…”

“…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.…”

THERMAL ANNEALING EFFECTS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THE Ta-W-Ta SOLID PHASE JOINTS FOR NEUTRON PRODUCING TARGETS OF THE RESEARCH NUCLEAR FACILITY “SOURCE OF NEUTRONS”

“…This fact is the evidence of the preferential niobium advance through the interfaces even at the stage of joining materials due to its increased diffusion mobility in comparison with neighboring materials. The same effect was also experimentally observed in such material pairs like Cu-Pb and stainless steel-Cu and others and described in [5,6,9]. With the annealing temperature increasing this effect intensifies (Fig.…”

“…A common technological technique for the vacuum hot roll bonding, is the possibility of influencing the transition zone formation process by introducing of a intermediate layer material into the contact zone [11] in order to reduce the rolling temperature, the reduction pressure and accelerate the high-quality solid-phase junctions formation when dissimilar materials joining is taking place. From this point of view it is appropriate to use intermediate layers that facilitate the volumetric interaction processes development in the contact zone and activate the joining process that is the materials with high plastic properties possessing a lower plastic deformation resistance comparing to those of the base metals [4][5][6][7][12][13][14]. As a rule the main requirement for such layers materials is the ability to form the solid solutions with both joining materials [9,15].…”

“…The laminates are a specific type of junctions and play an important role in today's innovative solutions where multitask solutions are required. The creation of the refractory metals solid-phase junctions with high tightness which can prevent the radioactive products release from tungsten into the cooling water is possible by using the vacuum hot roll bonding (VHRB) [3][4][5][6][7][8][9]. The point of this method is heating and subsequent entire batch deformation consisting of materials layers to be joined by means of roll bonding under the vacuum conditions.…”