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HomeMaterials Science ForumMaterials Science Forum Vols. 667-669Grain Size Effect on Deformation Twinning and...

Grain Size Effect on Deformation Twinning and De-Twinning in a Nanocrystalline Ni-Fe Alloy

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Abstract:

The effect of grain size on the deformation twinning and de-twinning in a nanocrystalline Ni-Fe alloy was investigated using transmission electron microscopy. Specimens with different grain sizes were obtained by severely deforming an electrochemically deposited nanocrystalline Ni-20wt.% Fe alloy using high-pressure torsion, which resulted in continuous grain growth from an average grain size of ~ 21 nm in the as-deposited material to ~ 72 nm for the highest strain applied in this study. Results show that deformation de-twinning occurs at very small grain sizes while deformation twinning takes place when the grain size is larger than ~ 45 nm. The mechanism of the observed grain size effect on twinning and de-twinning is briefly discussed.

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Periodical:

Materials Science Forum (Volumes 667-669)

Pages:

181-186

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.667-669.181

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Online since:

December 2010

Authors:

Song Ni, Yan Bo Wang, Xiao Zhou Liao, Saleh N. Alhajeri, H.Q. Li, Simon P. Ringer, Terence G. Langdon, Yun Tian Zhu

Keywords:

Twinning, De-Twinning, Nanocrystalline Material, Ni-Fe Alloy

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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