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

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

^*Corresponding author for this work

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

48 Citations (Scopus)

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.

Original language	English
Pages (from-to)	3398-3403
Journal	Materials Science and Engineering A
Volume	528
Issue number	9
Online published	12 Jan 2011
DOIs	https://doi.org/10.1016/j.msea.2011.01.017
Publication status	Published - 15 Apr 2011
Externally published	Yes

Research Keywords

Dislocation density
Nanocrystalline materials
Severe plastic deformation
Strain hardening
Strain softening

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10.1016/j.msea.2011.01.017

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

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. {\textcopyright} 2011 Elsevier B.V.",

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author = "S. Ni and Wang, {Y. B.} and Liao, {X. Z.} and Alhajeri, {S. N.} and Li, {H. Q.} and Zhao, {Y. H.} and Lavernia, {E. J.} and Ringer, {S. P.} and Langdon, {T. G.} and Zhu, {Y. T.}",

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doi = "10.1016/j.msea.2011.01.017",

language = "English",

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TY - JOUR

T1 - Strain hardening and softening in a nanocrystalline Ni-Fe alloy induced by severe plastic deformation

AU - Ni, S.

AU - Wang, Y. B.

AU - Liao, X. Z.

AU - Alhajeri, S. N.

AU - Li, H. Q.

AU - Zhao, Y. H.

AU - Lavernia, E. J.

AU - Ringer, S. P.

AU - Langdon, T. G.

AU - Zhu, Y. T.

PY - 2011/4/15

Y1 - 2011/4/15

N2 - 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.

AB - 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.

KW - Dislocation density

KW - Nanocrystalline materials

KW - Severe plastic deformation

KW - Strain hardening

KW - Strain softening

KW - Dislocation density

KW - Nanocrystalline materials

KW - Severe plastic deformation

KW - Strain hardening

KW - Strain softening

KW - Dislocation density

KW - Nanocrystalline materials

KW - Severe plastic deformation

KW - Strain hardening

KW - Strain softening

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U2 - 10.1016/j.msea.2011.01.017

DO - 10.1016/j.msea.2011.01.017

M3 - RGC 21 - Publication in refereed journal

SN - 0921-5093

VL - 528

SP - 3398

EP - 3403

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

IS - 9

ER -

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

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Research Keywords

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