Strain hardening and softening in a nanocrystalline Ni-Fe alloy induced by severe plastic deformation

S. Ni; Y. B. Wang; X. Z. Liao; S. N. Alhajeri; H. Q. Li; Y. H. Zhao; E. J. Lavernia; S. P. Ringer; T. G. Langdon; Y. T. Zhu

doi:10.1016/j.msea.2011.01.017

Author(s)

S. Ni
Y. B. Wang
X. Z. Liao
S. N. Alhajeri
H. Q. Li
Y. H. Zhao
E. J. Lavernia
S. P. Ringer
T. G. Langdon

Detail(s)

Original language	English
Pages (from-to)	3398-3403
Journal / Publication	Materials Science and Engineering A
Volume	528
Issue number	9
Online published	12 Jan 2011
Publication status	Published - 15 Apr 2011
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/j.msea.2011.01.017 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-79951673541&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(f8d7eeb8-0461-440c-8977-a36921c989e0).html

Abstract

The strain response of an electrochemically deposited nanocrystalline Ni-20. wt.% Fe alloy processed by high-pressure torsion (HPT) was investigated by monitoring changes in hardness. Strain hardening was observed in the very early stage of HPT, followed by strain softening before the onset of a second strain hardening stage. Structural investigations revealed that the two hardening stages were associated with an increase in dislocation density, whereas the strain softening stage was accompanied by a reduction in the dislocation and twin densities, thereby demonstrating the main dependence of hardness on the dislocation density in this material. Grain growth occurred during HPT and its role in the hardness evolution is also discussed. © 2011 Elsevier B.V.

Research Area(s)

Dislocation density, Nanocrystalline materials, Severe plastic deformation, Strain hardening, Strain softening

Citation Format(s)

[ RIS ] [ BibTeX ]

Strain hardening and softening in a nanocrystalline Ni-Fe alloy induced by severe plastic deformation. / Ni, S.; Wang, Y. B.; Liao, X. Z. et al.
In: Materials Science and Engineering A, Vol. 528, No. 9, 15.04.2011, p. 3398-3403.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Ni, S, Wang, YB, Liao, XZ, Alhajeri, SN, Li, HQ, Zhao, YH, Lavernia, EJ, Ringer, SP, Langdon, TG & Zhu, YT 2011, 'Strain hardening and softening in a nanocrystalline Ni-Fe alloy induced by severe plastic deformation', Materials Science and Engineering A, vol. 528, no. 9, pp. 3398-3403. https://doi.org/10.1016/j.msea.2011.01.017

Ni, S., Wang, Y. B., Liao, X. Z., Alhajeri, S. N., Li, H. Q., Zhao, Y. H., Lavernia, E. J., Ringer, S. P., Langdon, T. G., & Zhu, Y. T. (2011). Strain hardening and softening in a nanocrystalline Ni-Fe alloy induced by severe plastic deformation. Materials Science and Engineering A, 528(9), 3398-3403. https://doi.org/10.1016/j.msea.2011.01.017

Ni S, Wang YB, Liao XZ, Alhajeri SN, Li HQ, Zhao YH et al. Strain hardening and softening in a nanocrystalline Ni-Fe alloy induced by severe plastic deformation. Materials Science and Engineering A. 2011 Apr 15;528(9):3398-3403. Epub 2011 Jan 12. doi: 10.1016/j.msea.2011.01.017

Ni, S. ; Wang, Y. B. ; Liao, X. Z. et al. / Strain hardening and softening in a nanocrystalline Ni-Fe alloy induced by severe plastic deformation. In: Materials Science and Engineering A. 2011 ; Vol. 528, No. 9. pp. 3398-3403.