Bending behavior of a wrought magnesium alloy investigated by the in situ pinhole neutron diffraction method

Wei Wu; Alexandru D. Stoica; Dunji Yu; Matthew J. Frost; Harley D. Skorpenske; Ke An

doi:10.3390/cryst8090348

Bending behavior of a wrought magnesium alloy investigated by the in situ pinhole neutron diffraction method

Wei Wu, Alexandru D. Stoica, Dunji Yu, Matthew J. Frost, Harley D. Skorpenske, Ke An

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The tensile twinning and detwinning behaviors of a wrought magnesium alloy have been investigated during in situ four-point bending using the state-of-the-art high spatial resolution pinhole neutron diffraction (PIND) method. The PIND method allowed us to resolve the tensile twinning/detwinning and lattice strain distributions across the bending sample during a loading-unloading sequence with a 0.5 mm step size. It was found that the extensive tensile twinning and detwinning occurred near the compression surface, while no tensile twinning behavior was observed in the middle layer and tension side of the bending sample. During the bending, the neutral plane shifted from the compression side to the tension side. Compared with the traditional neutron diffraction mapping method, the PIND method provides more detailed information inside the bending sample due to a higher spatial resolution.

Original language	English
Article number	348
Journal	Crystals
Volume	8
Issue number	9
DOIs	https://doi.org/10.3390/cryst8090348
State	Published - Sep 2018
Externally published	Yes

Funding

This research was funded by a Laboratory Directed Research and Development project (LDRD-6789) of ORNL. This work was supported by a Laboratory Directed Research and Development project (LDRD-6789) of ORNL. This research used resources at the Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL), supported by the U.S. Department of Energy, Basic Energy Sciences, Scientific User Facilities Division. We thank Rick Allen for his engineering support. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). Acknowledgments: This work was supported by a Laboratory Directed Research and Development project (LDRD-6789) of ORNL. This research used resources at the Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL), supported by the U.S. Department of Energy, Basic Energy Sciences, Scientific User Facilities Division. We thank Rick Allen for his engineering support. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

Keywords

Bending
Mg alloys
Pinhole neutron diffraction
Tensile twinning

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10.3390/cryst8090348

Cite this

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title = "Bending behavior of a wrought magnesium alloy investigated by the in situ pinhole neutron diffraction method",

abstract = "The tensile twinning and detwinning behaviors of a wrought magnesium alloy have been investigated during in situ four-point bending using the state-of-the-art high spatial resolution pinhole neutron diffraction (PIND) method. The PIND method allowed us to resolve the tensile twinning/detwinning and lattice strain distributions across the bending sample during a loading-unloading sequence with a 0.5 mm step size. It was found that the extensive tensile twinning and detwinning occurred near the compression surface, while no tensile twinning behavior was observed in the middle layer and tension side of the bending sample. During the bending, the neutral plane shifted from the compression side to the tension side. Compared with the traditional neutron diffraction mapping method, the PIND method provides more detailed information inside the bending sample due to a higher spatial resolution.",

keywords = "Bending, Mg alloys, Pinhole neutron diffraction, Tensile twinning",

author = "Wei Wu and Stoica, {Alexandru D.} and Dunji Yu and Frost, {Matthew J.} and Skorpenske, {Harley D.} and Ke An",

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AU - Stoica, Alexandru D.

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AU - Skorpenske, Harley D.

AU - An, Ke

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AB - The tensile twinning and detwinning behaviors of a wrought magnesium alloy have been investigated during in situ four-point bending using the state-of-the-art high spatial resolution pinhole neutron diffraction (PIND) method. The PIND method allowed us to resolve the tensile twinning/detwinning and lattice strain distributions across the bending sample during a loading-unloading sequence with a 0.5 mm step size. It was found that the extensive tensile twinning and detwinning occurred near the compression surface, while no tensile twinning behavior was observed in the middle layer and tension side of the bending sample. During the bending, the neutral plane shifted from the compression side to the tension side. Compared with the traditional neutron diffraction mapping method, the PIND method provides more detailed information inside the bending sample due to a higher spatial resolution.

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Bending behavior of a wrought magnesium alloy investigated by the in situ pinhole neutron diffraction method

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