Strain softening in nanocrystalline Ni-Fe alloy induced by large HPT revolutions

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

doi:10.1016/j.msea.2011.03.007

Strain softening in nanocrystalline Ni-Fe alloy induced by large HPT revolutions

S. Ni, Y. B. Wang, X. Z. Liao^*, R. B. Figueiredo, 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

17 Citations (Scopus)

Abstract

The influence of strain on the hardness of an electrochemically deposited nanocrystalline Ni-20. wt.% Fe alloy processed by high-pressure torsion (HPT) for 20 and 30 revolutions was investigated. Strain softening followed by a stable hardness value was observed. Structural investigations revealed that, while dislocation density was important, continuous grain growth played a major role in the strain softening. The stable hardness indicates that an equilibrium structure was achieved, supporting a dynamic balance between deformation-induced grain growth and grain refinement and between deformation-induced dislocation generation and dislocation annihilation. © 2011 Elsevier B.V.

Original language	English
Pages (from-to)	4807-4811
Journal	Materials Science and Engineering A
Volume	528
Issue number	13-14
Online published	8 Mar 2011
DOIs	https://doi.org/10.1016/j.msea.2011.03.007
Publication status	Published - 25 May 2011
Externally published	Yes

Research Keywords

Dislocation density
Lomer-Cottrell locks
Nanocrystalline materials
Severe plastic deformation
Strain softening

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10.1016/j.msea.2011.03.007

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title = "Strain softening in nanocrystalline Ni-Fe alloy induced by large HPT revolutions",

abstract = "The influence of strain on the hardness of an electrochemically deposited nanocrystalline Ni-20. wt.% Fe alloy processed by high-pressure torsion (HPT) for 20 and 30 revolutions was investigated. Strain softening followed by a stable hardness value was observed. Structural investigations revealed that, while dislocation density was important, continuous grain growth played a major role in the strain softening. The stable hardness indicates that an equilibrium structure was achieved, supporting a dynamic balance between deformation-induced grain growth and grain refinement and between deformation-induced dislocation generation and dislocation annihilation. {\textcopyright} 2011 Elsevier B.V.",

keywords = "Dislocation density, Lomer-Cottrell locks, Nanocrystalline materials, Severe plastic deformation, Strain softening, Dislocation density, Lomer-Cottrell locks, Nanocrystalline materials, Severe plastic deformation, Strain softening, Dislocation density, Lomer-Cottrell locks, Nanocrystalline materials, Severe plastic deformation, Strain softening",

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

year = "2011",

month = may,

day = "25",

doi = "10.1016/j.msea.2011.03.007",

language = "English",

volume = "528",

pages = "4807--4811",

journal = "Materials Science and Engineering A",

issn = "0921-5093",

publisher = "Elsevier Ltd.",

number = "13-14",

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TY - JOUR

T1 - Strain softening in nanocrystalline Ni-Fe alloy induced by large HPT revolutions

AU - Ni, S.

AU - Wang, Y. B.

AU - Liao, X. Z.

AU - Figueiredo, R. B.

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 - 2011/5/25

Y1 - 2011/5/25

N2 - The influence of strain on the hardness of an electrochemically deposited nanocrystalline Ni-20. wt.% Fe alloy processed by high-pressure torsion (HPT) for 20 and 30 revolutions was investigated. Strain softening followed by a stable hardness value was observed. Structural investigations revealed that, while dislocation density was important, continuous grain growth played a major role in the strain softening. The stable hardness indicates that an equilibrium structure was achieved, supporting a dynamic balance between deformation-induced grain growth and grain refinement and between deformation-induced dislocation generation and dislocation annihilation. © 2011 Elsevier B.V.

AB - The influence of strain on the hardness of an electrochemically deposited nanocrystalline Ni-20. wt.% Fe alloy processed by high-pressure torsion (HPT) for 20 and 30 revolutions was investigated. Strain softening followed by a stable hardness value was observed. Structural investigations revealed that, while dislocation density was important, continuous grain growth played a major role in the strain softening. The stable hardness indicates that an equilibrium structure was achieved, supporting a dynamic balance between deformation-induced grain growth and grain refinement and between deformation-induced dislocation generation and dislocation annihilation. © 2011 Elsevier B.V.

KW - Dislocation density

KW - Lomer-Cottrell locks

KW - Nanocrystalline materials

KW - Severe plastic deformation

KW - Strain softening

KW - Dislocation density

KW - Lomer-Cottrell locks

KW - Nanocrystalline materials

KW - Severe plastic deformation

KW - Strain softening

KW - Dislocation density

KW - Lomer-Cottrell locks

KW - Nanocrystalline materials

KW - Severe plastic deformation

KW - Strain softening

UR - http://www.scopus.com/inward/record.url?scp=79953291775&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-79953291775&origin=recordpage

U2 - 10.1016/j.msea.2011.03.007

DO - 10.1016/j.msea.2011.03.007

M3 - RGC 21 - Publication in refereed journal

SN - 0921-5093

VL - 528

SP - 4807

EP - 4811

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

IS - 13-14

ER -

Strain softening in nanocrystalline Ni-Fe alloy induced by large HPT revolutions

Abstract

Research Keywords

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