Stage IV work-hardening related to disorientations in dislocation structures

W. Pantleon

doi:10.1016/j.msea.2003.11.088

Stage IV work-hardening related to disorientations in dislocation structures

Research output: Contribution to journal › Conference article › Research › peer-review

Abstract

The effect of deformation-induced disorientations on the work-hardening of metals is modelled based on dislocation dynamics. Essentially, Kocks’ dislocation model describing stage III hardening is extended to stage IV by incorporation of excess dislocations related to the disorientations. Disorientations evolving from purely statistical reasons — leading to a square root dependence of the average disorientation angle on strain — affect the initial work-hardening rate (and the saturation stress) of stage III only slightly. On the other hand, deterministic contributions to the development of disorientations, as differences in the activated slip systems across boundaries, cause a linear increase of the flow stress at large strains. Such a constant work-hardening rate is characteristic for stage IV.

Original language	English
Journal	Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing
Volume	387-389
Pages (from-to)	257-261
ISSN	0921-5093
DOIs	https://doi.org/10.1016/j.msea.2003.11.088
Publication status	Published - 2004
Event	13th International Conference on the Strength of Materials - Budapest, Hungary Duration: 25 Aug 2003 → 30 Aug 2003 Conference number: 13

Conference

Conference	13th International Conference on the Strength of Materials
Number	13
Country/Territory	Hungary
City	Budapest
Period	25/08/2003 → 30/08/2003

Keywords

Work-hardening
Stage IV
Disorientation
Dislocation
Modelling
Aluminium

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title = "Stage IV work-hardening related to disorientations in dislocation structures",

abstract = "The effect of deformation-induced disorientations on the work-hardening of metals is modelled based on dislocation dynamics. Essentially, Kocks{\textquoteright} dislocation model describing stage III hardening is extended to stage IV by incorporation of excess dislocations related to the disorientations. Disorientations evolving from purely statistical reasons — leading to a square root dependence of the average disorientation angle on strain — affect the initial work-hardening rate (and the saturation stress) of stage III only slightly. On the other hand, deterministic contributions to the development of disorientations, as differences in the activated slip systems across boundaries, cause a linear increase of the flow stress at large strains. Such a constant work-hardening rate is characteristic for stage IV.",

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author = "W. Pantleon",

year = "2004",

doi = "10.1016/j.msea.2003.11.088",

language = "English",

volume = "387-389",

pages = "257--261",

journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",

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T1 - Stage IV work-hardening related to disorientations in dislocation structures

AU - Pantleon, W.

N1 - Conference code: 13

PY - 2004

Y1 - 2004

N2 - The effect of deformation-induced disorientations on the work-hardening of metals is modelled based on dislocation dynamics. Essentially, Kocks’ dislocation model describing stage III hardening is extended to stage IV by incorporation of excess dislocations related to the disorientations. Disorientations evolving from purely statistical reasons — leading to a square root dependence of the average disorientation angle on strain — affect the initial work-hardening rate (and the saturation stress) of stage III only slightly. On the other hand, deterministic contributions to the development of disorientations, as differences in the activated slip systems across boundaries, cause a linear increase of the flow stress at large strains. Such a constant work-hardening rate is characteristic for stage IV.

AB - The effect of deformation-induced disorientations on the work-hardening of metals is modelled based on dislocation dynamics. Essentially, Kocks’ dislocation model describing stage III hardening is extended to stage IV by incorporation of excess dislocations related to the disorientations. Disorientations evolving from purely statistical reasons — leading to a square root dependence of the average disorientation angle on strain — affect the initial work-hardening rate (and the saturation stress) of stage III only slightly. On the other hand, deterministic contributions to the development of disorientations, as differences in the activated slip systems across boundaries, cause a linear increase of the flow stress at large strains. Such a constant work-hardening rate is characteristic for stage IV.

KW - 5-I nano

KW - Work-hardening

KW - Stage IV

KW - Disorientation

KW - Dislocation

KW - Modelling

KW - Aluminium

U2 - 10.1016/j.msea.2003.11.088

DO - 10.1016/j.msea.2003.11.088

M3 - Conference article

SN - 0921-5093

VL - 387-389

SP - 257

EP - 261

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

T2 - 13th International Conference on the Strength of Materials

Y2 - 25 August 2003 through 30 August 2003

ER -

Stage IV work-hardening related to disorientations in dislocation structures

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