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Influence of stacking-fault energy on the accommodation of severe shear strain in Cu-Al alloys during equal-channel angular pressing

Published online by Cambridge University Press:  31 January 2011

Xianghai An ,
Qingyun Lin ,
Shen Qu ,
Gang Yang ,
Shiding Wu  and
Zhe-Feng Zhang
Shen Qu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Gang Yang
Affiliation:
Central Iron and Steel Research Institute, Beijing 100081, China
Shiding Wu*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Zhe-Feng Zhang*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
a) e-mail: shdwu@imr.ac.cn
b) e-mail: zhfzhang@imr.ac.cn
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Abstract

X-ray diffraction (XRD) and transmission electron microscope (TEM) investigations have been carried out to decode the influence of stacking-fault energy (SFE) on the accommodation of large shear deformation in Cu-Al alloys subjected to one-pass equal-channel angular pressing. XRD results exhibit that the microstrain and density of dislocations initially increased with the reduction in the SFE, whereas they sharply decreased with a further decrease in SFE. By systematic TEM observations, we noticed that the accommodation mechanism of intense shear strain was gradually transformed from dislocation slip to deformation twin when SFE was lowered. Meanwhile, twin intersections and internal twins were also observed in the Cu-Al alloy with extremely low SFE. Due to the large external plastic deformation, microscale shear bands, as an inherent deformation mechanism, are increasingly significant to help carry the high local plasticity because low SFE facilitates the formation of shear bands.

Keywords

AlloyCold workingMicrostructure

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Type
Articles
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Journal of Materials Research , Volume 24 , Issue 12 , December 2009 , pp. 3636 - 3646
Copyright
Copyright © Materials Research Society 2009

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