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  4. In situ characterization of work hardening and springback in grade 2 alpha-titanium under tensile load
 
research article

In situ characterization of work hardening and springback in grade 2 alpha-titanium under tensile load

Sofinowski, K.
•
Smid, M.
•
Van Swygenhoven, Helena  
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December 1, 2019
Acta Materialia

Plastic effects during sheet metal forming can lead to undesirable distortions in formed components. Here, the three-stage work hardening and plastic strain recovery ("springback") in a cold-rolled, alpha-phase commercially pure titanium is examined. Interrupted standard tensile tests with in situ x-ray diffraction and quasi-in situ electron backscatter diffraction show that twinning plays a minor role in both of these phenomena. The experiments give evidence that the observed work hardening plateau is the result of an abrupt activation and multiplication of (c + a) slip and a subsequent redistribution of load between grain families. The springback can be attributed to inelastic backwards motion and annihilation of dislocations, driven by backstresses from dislocation-based hardening during loading. The peak broadening behavior, observed by x-ray diffraction, suggests that the internal stress state is highest in the rolling direction, resulting in consistently higher springback magnitude along this direction. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd.

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Type
research article
DOI
10.1016/j.actamat.2019.09.039
Web of Science ID

WOS:000498749300008

Author(s)
Sofinowski, K.
Smid, M.
Van Swygenhoven, Helena  
Rahimi, S.
Connolley, T.
Date Issued

2019-12-01

Published in
Acta Materialia
Volume

181

Start page

87

End page

98

Subjects

Materials Science, Multidisciplinary

•

Metallurgy & Metallurgical Engineering

•

Materials Science

•

springback

•

work hardening plateau

•

cp-titanium

•

in situ x-ray diffraction

•

ebsd

•

commercially pure titanium

•

magnesium alloy az31

•

plastic-deformation

•

mechanical-properties

•

constitutive model

•

grain-size

•

strain

•

behavior

•

orientation

•

diffraction

Note

This is an open access article under the terms of the Creative Commons Attribution License

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
UPSWYG  
Available on Infoscience
December 15, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/164013
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