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The Effect of Low Deformation Asymmetric Rolling on Microstructure and Texture of the Polycrystalline Copper

Uniwersał A., Wróbel M., Wroński S., Kalemba-Rec I., Wroński M., Wierzbanowski K., Baczmański A., Bacroix B.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 4

2183--2188

In the most recent years the asymmetric rolling (AR) attracts attention of researchers and technologists. This process can improve some technological parameters (e.g. modification of rolling torque and load, power requirements, etc.) as well as provide the possibility of grain refinement in a relatively inexpensive way. Most of the reports concerning microstructural changes produced by AR refer to high deformations imposed in highly asymmetric conditions. However, such rolling conditions are difficult to control, so there are no prospects to their quick industrial implementation. The present paper refers to relatively low deformation and low asymmetry rate, that is much more interesting for the industry. It was shown that bending of the rolled band (important disadvantage of the AR technology) can be controlled by adjusting of the amount of deformation and asymmetry. It was also shown that ca. 30% reduction in thickness during cold rolling, together with a relatively low asymmetry, reduces significantly the grain size and produces a more fragmented microstructure inside grains of the polycrystalline copper comparing to the symmetric rolling (SR). The material hardness after AR is higher than after the SR. Moreover, the crystallographic texture asymmetry, expressed by its rotation around the transverse direction, is observed in the AR material.

Nitrogen-15 Kinetic Isotope Effects in the Decomposition of Nitric Oxide on Copper

Polič S., Senegačnik M., Kobal I., Zieliński M.

Polish Journal of Chemistry

2002

Vol. 76 / nr 7

1009-1018

Isotopic rate constant ratios, k14/k15, have been determined for the decomposition of nitric oxide over copper wire at initial NO pressures 40-60 kPa over temperature range 725-825 K. They were interpreted using the Bigeleisen formalism. Under these experimental conditions the reaction was found to be second order in NO. On the basis of the temperature independence, k14/k15 = 1.010 š 0.001 at all temperatures studied, a cis ONNO transition state was shown to account satisfactorily for the experimental k14/k15 values.

Influence of rolling mode on texture development in polycrystalline Cu and Cu-5 wt.% Al alloy.

Wróbel M., Pospiech J., Bonarski J., Blicharski M., Moskalewicz T.

Inżynieria Materiałowa

2001

R. XXII, nr 5

970-973

Texture and microstructure development during homogeneous rolling of polycrystalline Cu and Cu-5 wt. % Al alloy were investigated. Two samples of each metal were rolled. One sample was rolled only in one direction in all passes. The second one was rolled in both directions by reversing the ends between passes. Some differences in the textures depending on the rolling mode have been observed in the deformation range of intensive twinning of the Cu-5 wt. % Al alloy and explained by polarization of twinning. No clear effect of the rolling mode on microstructure was observed.

W pracy przedstawiono wyniki badań rozwoju tekstury i mikrostruktury podczas jednorodnego walcowania materiałów polikrystalicznych Cu i Cu-5%Al. Walcowano po dwie próbki każdego materiału. Jedna z nich była walcowana w tym samym kierunku w każdym przepuście a w przypadku drugiej próbki, w kolejnych przepustach kierunek walcowania zmieniano na przeciwny. Na teksturę stopu Cu-5%Al wpływał sposób walcowania w zakresie odkształceń intensywnego bliźniakowania. W przypadku miedzi nie zaobserwowano wpływu sposobu walcowania na teksturę. Nie zaobserwowano również wpływu sposobu walcowania na mikrostrukturę obydwu metali.