Ni, S., Wang, Y.B., Liao, X. Z., Alhajeri, S.N., Li, Hh. Q., Ringer, S. P., Langdon, T.G. and Zhu, Y.T.
Grain size effect on deformation twinning and de-twinning in a nanocrystalline Ni-Fe alloy
Materials Science Forum, (667-669), . (doi:10.4028/www.scientific.net/MSF).
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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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