Resolving intragranular stress fields in plastically deformed titanium using point-focused high-energy diffraction microscopy

The response of a polycrystalline material to a mechanical load depends not only on the response of each individual grain, but also on the interaction with its neighbors. These interactions lead to local, intragranular stress concentrations that often dictate the initiation of plastic deformation an...

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Bibliographic Details
Published in:Journal of materials research 2023-01, Vol.38 (1), p.165-178
Main Authors: Li, Wenxi, Sharma, Hemant, Kenesei, Peter, Ravi, Sidharth, Sehitoglu, Huseyin, Bucsek, Ashley
Format: Article
Language:English
Subjects:
3D x-ray diffraction
Applied and Technical Physics
Biomaterials
Chemistry and Materials Science
Deformation
deformation twinning
Grain boundaries
grain boundary
high-energy diffraction microscopy
Inorganic Chemistry
intragranular strain mapping
Invited Feature Paper
Materials Engineering
Materials research
MATERIALS SCIENCE
Microscopy
Nanotechnology
Plastic deformation
Polycrystals
slip
Stress concentration
Stress distribution
Synchrotron radiation
Synchrotrons
Titanium
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Summary:The response of a polycrystalline material to a mechanical load depends not only on the response of each individual grain, but also on the interaction with its neighbors. These interactions lead to local, intragranular stress concentrations that often dictate the initiation of plastic deformation and consequently the macroscopic stress–strain behavior. However, very few experimental studies have quantified intragranular stresses across bulk, three-dimensional volumes. In this work, a synchrotron X-ray diffraction technique called point-focused high-energy diffraction microscopy (pf-HEDM) is used to characterize intragranular deformation across a bulk, plastically deformed, polycrystalline titanium specimen. The results reveal the heterogenous stress distributions within individual grains and across grain boundaries, a stress concentration between a low and high Schmid factor grain pair, and a stress gradient near an extension twinning boundary. This work demonstrates the potential for the future use of pf-HEDM for understanding the local deformation associated with networks of grains and informing mesoscale models. Graphical abstract
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-022-00873-y