Effects of Twin Size on the Dislocation Configuration During Cyclic Deformation of Polycrystalline Twin Copper

Acta Metall Sin

2005, Vol. 41

Issue (1): 23- DOI:

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Effects of Twin Size on the Dislocation Configuration During Cyclic Deformation of Polycrystalline Twin Copper

GUO Xiaolong; LU Lei; LI Shouxin

Shenyang National Laboratory for Materials Science; Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016

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GUO Xiaolong; LU Lei; LI Shouxin. Effects of Twin Size on the Dislocation Configuration During Cyclic Deformation of Polycrystalline Twin Copper. Acta Metall Sin, 2005, 41(1): 23-.

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Abstract Symmetrical push-pull fatigue tests were conducted on as--electrodeposited polycrystalline twin copper. Different dislocation configurations were formed in twins with different widths. When the twin width $W_{\rm t} >1~ \mu$m, loop patches and walls were found in twins, the same as that in single crystal; when 1um>W>200 nm, ladder--like structures formed in twin, which like persistent slip bands (PSBs); when 200 nm>W>20 nm, only some dislocation fragments were found; when W<20 nm, no stable crystal dislocation segments exist in the twin.

Key words: Cu twin fatigue size effect

Received: 19 February 2004

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