In situ analysis of the influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy

Michal Gzyl, Raphaël Pesci, Andrzej Rosochowski, Sonia Boczkal, Lech Olejnik

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy was studied in this work by in situ microstructural analysis during tensile testing in a chamber of scanning electron microscope. Three types of samples used in this study were obtained by (1) extrusion (as-supplied), (2) I-ECAP and (3) I-ECAP followed by side upsetting. Microstructures, textures and mechanical properties were examined after each processing step. An analytical equation was used to describe flow stress curves of the samples which exhibited various modes of deformation (1) only by slip, (2) dominated by tensile twinning followed by slip and (3) dominated by contraction twinning followed by slip. It was shown that tensile twinning increases strain hardening rate, while the opposite is observed for contraction twinning. The effective Schmid factors for slip in volumes deformed by tensile and contraction twinning were determined in this work using modelling approach as 0.215 and 0.45, respectively. Contraction twinning was also revealed to be responsible for an earlier fracture of the extruded sample subjected to tension, since microcracking was shown explicitly to be initiated within twins.
LanguageEnglish
Pages2532-2543
Number of pages12
JournalJournal of Materials Science
Volume50
Issue number6
Early online date13 Jan 2015
DOIs
Publication statusPublished - Mar 2015

Fingerprint

Twinning
Magnesium alloys
Strain hardening
Microcracking
Tensile testing
Plastic flow
Extrusion
Electron microscopes
Textures
Scanning
Mechanical properties
Microstructure
Processing

Keywords

  • magnesium alloy
  • strain hardening
  • fracture mechanism

Cite this

@article{a44675f09ce743988814a8e812f56670,
title = "In situ analysis of the influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy",
abstract = "The influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy was studied in this work by in situ microstructural analysis during tensile testing in a chamber of scanning electron microscope. Three types of samples used in this study were obtained by (1) extrusion (as-supplied), (2) I-ECAP and (3) I-ECAP followed by side upsetting. Microstructures, textures and mechanical properties were examined after each processing step. An analytical equation was used to describe flow stress curves of the samples which exhibited various modes of deformation (1) only by slip, (2) dominated by tensile twinning followed by slip and (3) dominated by contraction twinning followed by slip. It was shown that tensile twinning increases strain hardening rate, while the opposite is observed for contraction twinning. The effective Schmid factors for slip in volumes deformed by tensile and contraction twinning were determined in this work using modelling approach as 0.215 and 0.45, respectively. Contraction twinning was also revealed to be responsible for an earlier fracture of the extruded sample subjected to tension, since microcracking was shown explicitly to be initiated within twins.",
keywords = "magnesium alloy, strain hardening, fracture mechanism",
author = "Michal Gzyl and Rapha{\"e}l Pesci and Andrzej Rosochowski and Sonia Boczkal and Lech Olejnik",
year = "2015",
month = "3",
doi = "10.1007/s10853-014-8812-0",
language = "English",
volume = "50",
pages = "2532--2543",
journal = "Journal of Materials Science",
issn = "0022-2461",
number = "6",

}

In situ analysis of the influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy. / Gzyl, Michal; Pesci, Raphaël; Rosochowski, Andrzej; Boczkal, Sonia; Olejnik, Lech.

In: Journal of Materials Science, Vol. 50, No. 6, 03.2015, p. 2532-2543.

Research output: Contribution to journalArticle

TY - JOUR

T1 - In situ analysis of the influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy

AU - Gzyl, Michal

AU - Pesci, Raphaël

AU - Rosochowski, Andrzej

AU - Boczkal, Sonia

AU - Olejnik, Lech

PY - 2015/3

Y1 - 2015/3

N2 - The influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy was studied in this work by in situ microstructural analysis during tensile testing in a chamber of scanning electron microscope. Three types of samples used in this study were obtained by (1) extrusion (as-supplied), (2) I-ECAP and (3) I-ECAP followed by side upsetting. Microstructures, textures and mechanical properties were examined after each processing step. An analytical equation was used to describe flow stress curves of the samples which exhibited various modes of deformation (1) only by slip, (2) dominated by tensile twinning followed by slip and (3) dominated by contraction twinning followed by slip. It was shown that tensile twinning increases strain hardening rate, while the opposite is observed for contraction twinning. The effective Schmid factors for slip in volumes deformed by tensile and contraction twinning were determined in this work using modelling approach as 0.215 and 0.45, respectively. Contraction twinning was also revealed to be responsible for an earlier fracture of the extruded sample subjected to tension, since microcracking was shown explicitly to be initiated within twins.

AB - The influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy was studied in this work by in situ microstructural analysis during tensile testing in a chamber of scanning electron microscope. Three types of samples used in this study were obtained by (1) extrusion (as-supplied), (2) I-ECAP and (3) I-ECAP followed by side upsetting. Microstructures, textures and mechanical properties were examined after each processing step. An analytical equation was used to describe flow stress curves of the samples which exhibited various modes of deformation (1) only by slip, (2) dominated by tensile twinning followed by slip and (3) dominated by contraction twinning followed by slip. It was shown that tensile twinning increases strain hardening rate, while the opposite is observed for contraction twinning. The effective Schmid factors for slip in volumes deformed by tensile and contraction twinning were determined in this work using modelling approach as 0.215 and 0.45, respectively. Contraction twinning was also revealed to be responsible for an earlier fracture of the extruded sample subjected to tension, since microcracking was shown explicitly to be initiated within twins.

KW - magnesium alloy

KW - strain hardening

KW - fracture mechanism

UR - http://link.springer.com/journal/10853

U2 - 10.1007/s10853-014-8812-0

DO - 10.1007/s10853-014-8812-0

M3 - Article

VL - 50

SP - 2532

EP - 2543

JO - Journal of Materials Science

T2 - Journal of Materials Science

JF - Journal of Materials Science

SN - 0022-2461

IS - 6

ER -