Direct observation of nucleation in the bulk of an opaque sample
Abstract
Remarkably little is known about the physical phenomena leading to nucleation of new perfect crystals within deformed metals during annealing, in particular how and where volumes with nearly perfect lattices evolve from structures filled with dislocations, and how local variations at the micrometer length scale affect this nucleation process. We present here the first experimental measurements that relate directly nucleation of recrystallization to the local deformation microstructure in the bulk of a sample of cold rolled aluminum, further deformed locally by a hardness indentation. White beam differential aperture X-ray microscopy is used for the measurements, allowing us to map a selected gauge volume in the bulk of the sample in the deformed state, then anneal the sample and map the exact same gauge volume in the annealed state. It is found that nuclei develop at sites of high stored energy and they have crystallographic orientations from those present in the deformed state. Accordingly we suggest that for each nucleus the embryonic volume arises from a structural element contained within the voxels identified with the same orientation. In conclusion, possible nucleation mechanisms are discussed and the growth potentials of the nuclei are also analyzed and discussed.
- Authors:
-
- Technical Univ. of Denmark (Denmark); Chongqing Univ., Chongqing (China)
- Technical Univ. of Denmark (Denmark)
- Tsinghua Univ., Beijing (People's Republic of China)
- Chongqing Univ., Chongqing (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division; Danish National Research Foundation; National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1404720
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Xu, Chaoling, Zhang, Yubin, Godfrey, Andrew, Wu, Guilin, Liu, Wenjun, Tischler, Jonathan Z., Liu, Qing, and Jensen, Dorte Juul. Direct observation of nucleation in the bulk of an opaque sample. United States: N. p., 2017.
Web. doi:10.1038/srep42508.
Xu, Chaoling, Zhang, Yubin, Godfrey, Andrew, Wu, Guilin, Liu, Wenjun, Tischler, Jonathan Z., Liu, Qing, & Jensen, Dorte Juul. Direct observation of nucleation in the bulk of an opaque sample. United States. https://doi.org/10.1038/srep42508
Xu, Chaoling, Zhang, Yubin, Godfrey, Andrew, Wu, Guilin, Liu, Wenjun, Tischler, Jonathan Z., Liu, Qing, and Jensen, Dorte Juul. Tue .
"Direct observation of nucleation in the bulk of an opaque sample". United States. https://doi.org/10.1038/srep42508. https://www.osti.gov/servlets/purl/1404720.
@article{osti_1404720,
title = {Direct observation of nucleation in the bulk of an opaque sample},
author = {Xu, Chaoling and Zhang, Yubin and Godfrey, Andrew and Wu, Guilin and Liu, Wenjun and Tischler, Jonathan Z. and Liu, Qing and Jensen, Dorte Juul},
abstractNote = {Remarkably little is known about the physical phenomena leading to nucleation of new perfect crystals within deformed metals during annealing, in particular how and where volumes with nearly perfect lattices evolve from structures filled with dislocations, and how local variations at the micrometer length scale affect this nucleation process. We present here the first experimental measurements that relate directly nucleation of recrystallization to the local deformation microstructure in the bulk of a sample of cold rolled aluminum, further deformed locally by a hardness indentation. White beam differential aperture X-ray microscopy is used for the measurements, allowing us to map a selected gauge volume in the bulk of the sample in the deformed state, then anneal the sample and map the exact same gauge volume in the annealed state. It is found that nuclei develop at sites of high stored energy and they have crystallographic orientations from those present in the deformed state. Accordingly we suggest that for each nucleus the embryonic volume arises from a structural element contained within the voxels identified with the same orientation. In conclusion, possible nucleation mechanisms are discussed and the growth potentials of the nuclei are also analyzed and discussed.},
doi = {10.1038/srep42508},
journal = {Scientific Reports},
number = ,
volume = 7,
place = {United States},
year = {Tue Feb 14 00:00:00 EST 2017},
month = {Tue Feb 14 00:00:00 EST 2017}
}
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Works referencing / citing this record:
Probing nanoscale structure and strain by dark-field x-ray microscopy
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High Resolution Mapping of Orientation and Strain Gradients in Metals by Synchrotron 3D X-ray Laue Microdiffraction
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