In situ characterization of twin nucleation in pure Ti using 3D-XRD

Thomas R. Bieler, Leyun Wang, Armand J. Beaudoin, Peter Kenesei, Ulrich Lienert

Research output: Contribution to journalArticle

  • 39 Citations

Abstract

A small tensile specimen of grade 1 commercially pure titanium was deformed to a few percent strain with concurrent synchrotron X-ray diffraction measurements to identify subsurface {10 \bar{1} 1 ̄ 2} twin nucleation events. This sample was from the same piece of material in which a prior study showed that twin nucleation stimulated by slip transfer across a grain boundary accounted for many instances of twin nucleation. The sample had a strong c-axis texture of about eight times random aligned with the tensile axis. After ∼1.5 pct tensile strain, three twin nucleation events were observed in grains where the c-axis was nearly parallel to the tensile direction. Far-field 3-D X-ray diffraction data were analyzed to obtain the positional center of mass, the average lattice strain, and stress tensors in each grain and twin. In one case where the parent grain was mostly surrounded by hard grain orientations, the twin system with the highest resolved shear stress (RSS) among the six {10 \bar{1} 1 ̄ 2} twin variants was activated and the stress in the parent grain decreased after twin nucleation. In two other parent grains with a majority of softer neighboring grain orientations, the observed twins did not occur on the twin system with the highest RSS. Their nucleation could be geometrically attributed to slip transfer from neighboring grains with geometrically favorable 〈a〉 basal slip systems, and the stress in the parent grain increased after twin nucleation. In all three twin events, the stress in the twin was 10 to 30 pct lower than the stress in the parent grain, indicating load partitioning between the hard-oriented parent grain and the soft-oriented twin.

LanguageEnglish (US)
Pages109-122
Number of pages14
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume45
Issue number1
DOIs
StatePublished - Jan 2014

Profile

Nucleation
nucleation
Shear stress
slip
X ray diffraction
shear stress
Tensile strain
Titanium
Synchrotrons
Tensors
Loads (forces)
Grain boundaries
Textures
stress tensors
diffraction
center of mass
far fields
grade
synchrotrons
x rays

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials

Cite this

In situ characterization of twin nucleation in pure Ti using 3D-XRD. / Bieler, Thomas R.; Wang, Leyun; Beaudoin, Armand J.; Kenesei, Peter; Lienert, Ulrich.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 45, No. 1, 01.2014, p. 109-122.

Research output: Contribution to journalArticle

Bieler, Thomas R. ; Wang, Leyun ; Beaudoin, Armand J. ; Kenesei, Peter ; Lienert, Ulrich. / In situ characterization of twin nucleation in pure Ti using 3D-XRD. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 2014 ; Vol. 45, No. 1. pp. 109-122
@article{bafbc5e938884d39b671ee76f235ce5b,
title = "In situ characterization of twin nucleation in pure Ti using 3D-XRD",
abstract = "A small tensile specimen of grade 1 commercially pure titanium was deformed to a few percent strain with concurrent synchrotron X-ray diffraction measurements to identify subsurface {10 \bar{1} 1 ̄ 2} twin nucleation events. This sample was from the same piece of material in which a prior study showed that twin nucleation stimulated by slip transfer across a grain boundary accounted for many instances of twin nucleation. The sample had a strong c-axis texture of about eight times random aligned with the tensile axis. After ∼1.5 pct tensile strain, three twin nucleation events were observed in grains where the c-axis was nearly parallel to the tensile direction. Far-field 3-D X-ray diffraction data were analyzed to obtain the positional center of mass, the average lattice strain, and stress tensors in each grain and twin. In one case where the parent grain was mostly surrounded by hard grain orientations, the twin system with the highest resolved shear stress (RSS) among the six {10 \bar{1} 1 ̄ 2} twin variants was activated and the stress in the parent grain decreased after twin nucleation. In two other parent grains with a majority of softer neighboring grain orientations, the observed twins did not occur on the twin system with the highest RSS. Their nucleation could be geometrically attributed to slip transfer from neighboring grains with geometrically favorable 〈a〉 basal slip systems, and the stress in the parent grain increased after twin nucleation. In all three twin events, the stress in the twin was 10 to 30 pct lower than the stress in the parent grain, indicating load partitioning between the hard-oriented parent grain and the soft-oriented twin.",
author = "Bieler, {Thomas R.} and Leyun Wang and Beaudoin, {Armand J.} and Peter Kenesei and Ulrich Lienert",
year = "2014",
month = "1",
doi = "10.1007/s11661-013-2082-3",
language = "English (US)",
volume = "45",
pages = "109--122",
journal = "Metallurgical Transactions A (Physical Metallurgy and Materials Science)",
issn = "1073-5623",
publisher = "Springer Boston",
number = "1",

}

TY - JOUR

T1 - In situ characterization of twin nucleation in pure Ti using 3D-XRD

AU - Bieler,Thomas R.

AU - Wang,Leyun

AU - Beaudoin,Armand J.

AU - Kenesei,Peter

AU - Lienert,Ulrich

PY - 2014/1

Y1 - 2014/1

N2 - A small tensile specimen of grade 1 commercially pure titanium was deformed to a few percent strain with concurrent synchrotron X-ray diffraction measurements to identify subsurface {10 \bar{1} 1 ̄ 2} twin nucleation events. This sample was from the same piece of material in which a prior study showed that twin nucleation stimulated by slip transfer across a grain boundary accounted for many instances of twin nucleation. The sample had a strong c-axis texture of about eight times random aligned with the tensile axis. After ∼1.5 pct tensile strain, three twin nucleation events were observed in grains where the c-axis was nearly parallel to the tensile direction. Far-field 3-D X-ray diffraction data were analyzed to obtain the positional center of mass, the average lattice strain, and stress tensors in each grain and twin. In one case where the parent grain was mostly surrounded by hard grain orientations, the twin system with the highest resolved shear stress (RSS) among the six {10 \bar{1} 1 ̄ 2} twin variants was activated and the stress in the parent grain decreased after twin nucleation. In two other parent grains with a majority of softer neighboring grain orientations, the observed twins did not occur on the twin system with the highest RSS. Their nucleation could be geometrically attributed to slip transfer from neighboring grains with geometrically favorable 〈a〉 basal slip systems, and the stress in the parent grain increased after twin nucleation. In all three twin events, the stress in the twin was 10 to 30 pct lower than the stress in the parent grain, indicating load partitioning between the hard-oriented parent grain and the soft-oriented twin.

AB - A small tensile specimen of grade 1 commercially pure titanium was deformed to a few percent strain with concurrent synchrotron X-ray diffraction measurements to identify subsurface {10 \bar{1} 1 ̄ 2} twin nucleation events. This sample was from the same piece of material in which a prior study showed that twin nucleation stimulated by slip transfer across a grain boundary accounted for many instances of twin nucleation. The sample had a strong c-axis texture of about eight times random aligned with the tensile axis. After ∼1.5 pct tensile strain, three twin nucleation events were observed in grains where the c-axis was nearly parallel to the tensile direction. Far-field 3-D X-ray diffraction data were analyzed to obtain the positional center of mass, the average lattice strain, and stress tensors in each grain and twin. In one case where the parent grain was mostly surrounded by hard grain orientations, the twin system with the highest resolved shear stress (RSS) among the six {10 \bar{1} 1 ̄ 2} twin variants was activated and the stress in the parent grain decreased after twin nucleation. In two other parent grains with a majority of softer neighboring grain orientations, the observed twins did not occur on the twin system with the highest RSS. Their nucleation could be geometrically attributed to slip transfer from neighboring grains with geometrically favorable 〈a〉 basal slip systems, and the stress in the parent grain increased after twin nucleation. In all three twin events, the stress in the twin was 10 to 30 pct lower than the stress in the parent grain, indicating load partitioning between the hard-oriented parent grain and the soft-oriented twin.

UR - http://www.scopus.com/inward/record.url?scp=84891628680&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84891628680&partnerID=8YFLogxK

U2 - 10.1007/s11661-013-2082-3

DO - 10.1007/s11661-013-2082-3

M3 - Article

VL - 45

SP - 109

EP - 122

JO - Metallurgical Transactions A (Physical Metallurgy and Materials Science)

T2 - Metallurgical Transactions A (Physical Metallurgy and Materials Science)

JF - Metallurgical Transactions A (Physical Metallurgy and Materials Science)

SN - 1073-5623

IS - 1

ER -