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Microstructure Evolution in Deformed Copper and Nickel

Published online by Cambridge University Press:  01 February 2011

Peri Landau ,
Roni Z. Shneck ,
Guy Makov  and
Arie Venkert
Peri Landau
Affiliation:
landaup@bgu.ac.il, Ben- Gurion University, Materials Engineering, 5 Dekel street, Reut, 71908, Israel
Roni Z. Shneck
Affiliation:
roni@bgu.ac.il, Ben- Gurion University, Materials Engineering, P.O.Box 653, Beer Sheva, 84105, Israel
Guy Makov
Affiliation:
makovg@bgu.ac.il, NRCN, Department of Physics, Beer Sheva, 84190, Israel
Arie Venkert
Affiliation:
venkert@bgu.ac.il, NRCN, Department of Physics, Beer Sheva, 84190, Israel
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Abstract

The combined effect of strain and temperature on the microstructure and detailed internal structure of dislocation boundaries was systematically studied in compressed pure polycrystalline copper and nickel and compared to the microstructure of compressed polycrystalline aluminum. Below 0.5Tm the microstructure of Cu and Ni consists of dislocation cells, however, only in Cu second generation microbands are formed. In Cu and Ni, the dislocations inside the boundaries rearrange themselves from tangles to ordered arrays of parallel dislocations following interplay between strain (requirement for cross slip) and temperature (dislocation mobility and ease of cross slip). The ordered detailed structure is similar to that observed in Al deformed at room temperature and lower strain levels. The amount of strain and temperature applied to Cu and Ni in order to achieve the same detailed structure formed in Al depends on the stacking fault energy (SFE) of the metal- higher strain and temperature as the SFE is lower.

Keywords

dislocationsmicrostructuretransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 982: Symposium KK – Electron Microscopy Across Hard and Soft Materials , 2006 , 0982-KK09-05
Copyright
Copyright © Materials Research Society 2007

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