Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing
Abstract
Synchrotron X-ray microbeam diffraction was used to measure the full elastic long range internal strain and stress tensors of low dislocation density regions within the submicrometer grain/subgrain structure of equal-channel angular pressed (ECAP) aluminum alloy AA1050 after 1, 2, and 8 passes using route BC. This is the first time that full tensors were measured in plastically deformed metals at this length scale. The maximum (most tensile or least compressive) principal elastic strain directions for the unloaded 1 pass sample for the grain/subgrain interiors align well with the pressing direction, and are more random for the 2 and 8 pass samples. The measurements reported here indicate that the local stresses and strains become increasingly isotropic (homogenized) with increasing ECAP passes using route BC. The average maximum (in magnitude) LRISs are -0.43 σa for 1 pass, -0.44 σa for 2 pass, and 0.14 σa for the 8 pass sample. Furthermore, these LRISs are larger than those reported previously because those earlier measurements were unable to measure the full stress tensor. Significantly, the measured stresses are inconsistent with the two-component composite model.
- Authors:
-
- Univ. of Southern California, Los Angeles, CA (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Univ. of Southern California, Los Angeles, CA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Southampton, Southampton (United Kingdom)
- Univ. of Southern California, Los Angeles, CA (United States); Univ. of Southampton, Southampton (United Kingdom)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); European Research Council (ERC); USDOE Office of Science (SC)
- OSTI Identifier:
- 1416147
- Alternate Identifier(s):
- OSTI ID: 1351010
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 112; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Aluminum; Diffraction; Full strain tensor; Severe plastic deformation; Synchrotron X-ray
Citation Formats
Phan, Thien Q., Levine, Lyle E., Lee, I-Fang, Xu, Ruqing, Tischler, Jonathan Z., Huang, Yi, Langdon, Terence G., and Kassner, Michael E. Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing. United States: N. p., 2016.
Web. doi:10.1016/j.actamat.2016.04.035.
Phan, Thien Q., Levine, Lyle E., Lee, I-Fang, Xu, Ruqing, Tischler, Jonathan Z., Huang, Yi, Langdon, Terence G., & Kassner, Michael E. Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing. United States. https://doi.org/10.1016/j.actamat.2016.04.035
Phan, Thien Q., Levine, Lyle E., Lee, I-Fang, Xu, Ruqing, Tischler, Jonathan Z., Huang, Yi, Langdon, Terence G., and Kassner, Michael E. Sat .
"Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing". United States. https://doi.org/10.1016/j.actamat.2016.04.035. https://www.osti.gov/servlets/purl/1416147.
@article{osti_1416147,
title = {Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing},
author = {Phan, Thien Q. and Levine, Lyle E. and Lee, I-Fang and Xu, Ruqing and Tischler, Jonathan Z. and Huang, Yi and Langdon, Terence G. and Kassner, Michael E.},
abstractNote = {Synchrotron X-ray microbeam diffraction was used to measure the full elastic long range internal strain and stress tensors of low dislocation density regions within the submicrometer grain/subgrain structure of equal-channel angular pressed (ECAP) aluminum alloy AA1050 after 1, 2, and 8 passes using route BC. This is the first time that full tensors were measured in plastically deformed metals at this length scale. The maximum (most tensile or least compressive) principal elastic strain directions for the unloaded 1 pass sample for the grain/subgrain interiors align well with the pressing direction, and are more random for the 2 and 8 pass samples. The measurements reported here indicate that the local stresses and strains become increasingly isotropic (homogenized) with increasing ECAP passes using route BC. The average maximum (in magnitude) LRISs are -0.43 σa for 1 pass, -0.44 σa for 2 pass, and 0.14 σa for the 8 pass sample. Furthermore, these LRISs are larger than those reported previously because those earlier measurements were unable to measure the full stress tensor. Significantly, the measured stresses are inconsistent with the two-component composite model.},
doi = {10.1016/j.actamat.2016.04.035},
journal = {Acta Materialia},
number = C,
volume = 112,
place = {United States},
year = {Sat Apr 23 00:00:00 EDT 2016},
month = {Sat Apr 23 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
A Comparison of Warm and Combined Warm and Low‐Temperature Processing Routes for the Equal‐Channel Angular Pressing of Pure Titanium
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High Resolution Mapping of Orientation and Strain Gradients in Metals by Synchrotron 3D X-ray Laue Microdiffraction
journal, March 2019
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- Quantum Beam Science, Vol. 3, Issue 1
Microstructure and Microhardness Evolution in Pure Molybdenum Processed by High‐Pressure Torsion
journal, December 2019
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- Advanced Engineering Materials, Vol. 22, Issue 4
Perspective on hetero-deformation induced (HDI) hardening and back stress
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Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy
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