MECHANICAL PROPERTIES OF DEFORMED INTERFACES IN BIMETALLIC JOINTS.

J.Maniks and F.Muktepavela, Institute of Solid State Physics,
University of Latvia, 8 Kengaraga St., Riga LV-1063, Latvia

The investigation of mechanical properties of interfaces in the fine
-grained and nanostructured metals and alloys causes significant
difficulties. New opportunities open the use of the bimetallic joints,
the interfaces in which are atomically clean and similar to the phase
boundaries in deformed metals or alloys. Strength, deformation
behaviour, fracture mode at 293K and 78K, and relaxation processes at
the interface of similar and dissimilar metals (Ni/Ni, Cu/Cu, Ni/Ag,
Fe/Cd, Al/Cd, Al/Pb, etc.) and commercial alloys (Al-Mg-Mn, Al-Cu-Mg)
has been investigated. Pairs of well-soluble and insoluble metals as
well as pairs forming chemical compounds and eutectics were chosen for
investigation. It was found that the mechanisms of plastic deformation
and relaxation processes on the interfaces depend on the schemes,
regimes and extent of the deformation and nature of metals also. The
interfaces in such systems as Cu/Sn, Al/Sn, and Zn/Sn exhibit
low-temperature brittleness after severe plastic deformation. For
superplastic Pb-Sn and Cd-Sn eutectics with low phase boundary energy,
the softening of interfaces is observed. The difference in the
strength properties of interfaces is related to differences in the
adherence, chemical interaction and evolution of structural defects.

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