Crystallographic orientation-dependent strain hardening in a precipitation-strengthened Al-Cu alloy
Abstract
While the strengthening of Al-Cu alloys due to precipitation has been extensively studied, the effect of crystallographic orientation of the matrix and precipitates, as well as precipitate morphology, on the strain hardening behavior is not well understood. In this paper, we investigate this effect with in situ neutron diffraction during deformation of an Al-Cu alloy (206) after multiple aging treatments. Precipitate-dislocation interactions were found to change from precipitate shearing for microstructures predominantly containing GPI and θ" precipitates to Orowan looping for microstructures with primarily θ' and θ precipitates. Notably, significant anisotropy in strain hardening behavior was observed when θ' precipitates were present, which was attributed to crystallographic orientation dependent load transfer from the Al matrix to the θ' precipitates. The anisotropic load transfer is hypothesized to be caused by the extent of rotation of high aspect-ratio θ' precipitates, owing to dislocations looping around them during plastic deformation of the matrix. Predictions from an analytical model describing the anisotropic magnitude of load transfer from precipitate rotation agree well with experimental results, successfully validating the precipitate rotation hypothesis and explaining the anisotropic strain hardening behavior. This model allows for the prediction of stresses separately in the precipitate and matrix phases as amore »
- Authors:
-
[1];
[2];
[2];
[2]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Colorado School of Mines, Golden, CO (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Colorado School of Mines, Golden, CO (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1756276
- Alternate Identifier(s):
- OSTI ID: 1780280
- Grant/Contract Number:
- AC05-00OR22725; 1624836
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 205; Journal Issue: 1; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Milligan, Brian K., Ma, Dong, Allard Jr, Lawrence, Clarke, Amy Jean, and Shyam, Amit. Crystallographic orientation-dependent strain hardening in a precipitation-strengthened Al-Cu alloy. United States: N. p., 2020.
Web. doi:10.1016/j.actamat.2020.116577.
Milligan, Brian K., Ma, Dong, Allard Jr, Lawrence, Clarke, Amy Jean, & Shyam, Amit. Crystallographic orientation-dependent strain hardening in a precipitation-strengthened Al-Cu alloy. United States. https://doi.org/10.1016/j.actamat.2020.116577
Milligan, Brian K., Ma, Dong, Allard Jr, Lawrence, Clarke, Amy Jean, and Shyam, Amit. Fri .
"Crystallographic orientation-dependent strain hardening in a precipitation-strengthened Al-Cu alloy". United States. https://doi.org/10.1016/j.actamat.2020.116577. https://www.osti.gov/servlets/purl/1756276.
@article{osti_1756276,
title = {Crystallographic orientation-dependent strain hardening in a precipitation-strengthened Al-Cu alloy},
author = {Milligan, Brian K. and Ma, Dong and Allard Jr, Lawrence and Clarke, Amy Jean and Shyam, Amit},
abstractNote = {While the strengthening of Al-Cu alloys due to precipitation has been extensively studied, the effect of crystallographic orientation of the matrix and precipitates, as well as precipitate morphology, on the strain hardening behavior is not well understood. In this paper, we investigate this effect with in situ neutron diffraction during deformation of an Al-Cu alloy (206) after multiple aging treatments. Precipitate-dislocation interactions were found to change from precipitate shearing for microstructures predominantly containing GPI and θ" precipitates to Orowan looping for microstructures with primarily θ' and θ precipitates. Notably, significant anisotropy in strain hardening behavior was observed when θ' precipitates were present, which was attributed to crystallographic orientation dependent load transfer from the Al matrix to the θ' precipitates. The anisotropic load transfer is hypothesized to be caused by the extent of rotation of high aspect-ratio θ' precipitates, owing to dislocations looping around them during plastic deformation of the matrix. Predictions from an analytical model describing the anisotropic magnitude of load transfer from precipitate rotation agree well with experimental results, successfully validating the precipitate rotation hypothesis and explaining the anisotropic strain hardening behavior. This model allows for the prediction of stresses separately in the precipitate and matrix phases as a function of crystallographic orientation, only given the bulk mechanical properties.},
doi = {10.1016/j.actamat.2020.116577},
journal = {Acta Materialia},
number = 1,
volume = 205,
place = {United States},
year = {Fri Dec 18 00:00:00 EST 2020},
month = {Fri Dec 18 00:00:00 EST 2020}
}
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