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3 1998

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The influence of twinning within shear bands on the recrystallization microtexture.

Paul H., Jasieński Z., Lityńska L., Piątkowski A.

Inżynieria Materiałowa

1998

R. XIX, nr 3

496-501

The microstructural and microtexture evolution of cold channel-die compressed and partly annealed cast strips of the 70/30 brass was investigated. Thanks to the application of measurements of individual local orientation it has been shown that within the shear bands (SBs) in the deformed state, two main microstructure components appear: the dominant Goss component G congruents {011}<100> and a weaker S congruents {123}<412> orientation. Nucleation of new grains inside the SBs is associated with the appearance of a family of thin needles of microtwins with near C congruents {112}<111> orientation, and strong retention orientations from the area with the so-called 'recovery twins' in the microtexture of new grains in early recrystallization stages was usually observed.

The gamma/b criterion and twin-dislocation interactions in face-centered cubic crystals.

Szczerba M.S.

Inżynieria Materiałowa

1998

R. XIX, nr 3

415-422

A close relation between the gamma/b stress and two types of twin-dislocation interaction in face centered cubic crystals was found. The interaction between a growing twin and a substructure of perfect dislocations leads to the load drop (LD) twinning, which is to occur, if the gamma/b stress is satisfied on the habit plane only. The interaction between a growing twin and a substructure dominated by imperfect dislocations leads to the no load drop (NLD) twinning, but now, the gamma/b stress must be satisfied on the habit plane and on any other, non-habit, close packed plane of crystal lattice. It is also suggested, that a mechanism of the incorporation of imperfect dislocation into a growing twin basis on an imperfect-perfect dislocation conversion.

Development of the {110}<001> orientation in a rolled Cu-5%Al single crystal with the (100)[011] initial orientation.

Krawczyk J., Wróbel M., Morgiel J., Dymek S., Blicharski M.

Inżynieria Materiałowa

1998

R. XIX, nr 3

596-599

The intensive twinning and crystal break-up into deformation bands occurred during cold rolling of a Cu-5%Al single crystal with the initial orientation (100)[011]. Due to rotation of the initial orientation and intensive twinning large areas with the {110}<001> orientation were formed close to the rolled surfaces. Relatively uniform microstructure consisted of mutually intersecting dislocation bands featured areas of such orientation. Shear bands appeared close to the central layer of the rolled material in the regions with the large density of deformation twins parallel to the rolling plane. Cells composing shear bands had usually orientations near {110}<001>.