Effect of grain-boundary θ-Al2Cu precipitates on tensile and compressive creep properties of cast Al–Cu–Mn–Zr alloys
Abstract
Tensile and compressive creep tests were performed at 300 °C on high-temperature Al–Cu–Mn–Zr (ACMZ) alloys with 6 wt% Cu (6Cu) and 9 wt% Cu (9Cu) to evaluate the effect on creep properties of micron-size θ-Al2Cu intergranular precipitates. For compressive creep, the increased volume fraction of θ-precipitates at grain boundaries (from ~0.7% in 6Cu to ~ 6% in 9Cu) does not affect deformation rates across the investigated stress range of 15–110 MPa, consistent with creep being controlled by submicron θ'-Al2Cu precipitates within grains, whose size and fractions are the same in both alloys. In contrast, for tensile creep, 9Cu creeps faster than 6Cu at stresses above 20 MPa, and this difference increases with the stress level. Additionally, this discrepancy between tensile and compressive creep behavior is explained by cavitation during tensile creep, which is favored by higher volume fraction and larger size of intergranular θ precipitates in 9Cu. Conversely, larger precipitates impede cavity linkage resulting in improved creep ductility of 9Cu as compared to 6Cu at 300 °C.
- Authors:
-
[1];
[2];
[1]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Northwestern Univ., Evanston, IL (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)
- OSTI Identifier:
- 1863295
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Additional Journal Information:
- Journal Volume: 840; Journal Issue: -; Journal ID: ISSN 0921-5093
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Al-Cu alloys; creep; intergranular precipitates; theta-Al2Cu; cavitation
Citation Formats
Bahl, Sumit, Rakhmonov, Jovid U., Kenel, Christoph, Dunand, David C., and Shyam, Amit. Effect of grain-boundary θ-Al2Cu precipitates on tensile and compressive creep properties of cast Al–Cu–Mn–Zr alloys. United States: N. p., 2022.
Web. doi:10.1016/j.msea.2022.142946.
Bahl, Sumit, Rakhmonov, Jovid U., Kenel, Christoph, Dunand, David C., & Shyam, Amit. Effect of grain-boundary θ-Al2Cu precipitates on tensile and compressive creep properties of cast Al–Cu–Mn–Zr alloys. United States. https://doi.org/10.1016/j.msea.2022.142946
Bahl, Sumit, Rakhmonov, Jovid U., Kenel, Christoph, Dunand, David C., and Shyam, Amit. Sat .
"Effect of grain-boundary θ-Al2Cu precipitates on tensile and compressive creep properties of cast Al–Cu–Mn–Zr alloys". United States. https://doi.org/10.1016/j.msea.2022.142946. https://www.osti.gov/servlets/purl/1863295.
@article{osti_1863295,
title = {Effect of grain-boundary θ-Al2Cu precipitates on tensile and compressive creep properties of cast Al–Cu–Mn–Zr alloys},
author = {Bahl, Sumit and Rakhmonov, Jovid U. and Kenel, Christoph and Dunand, David C. and Shyam, Amit},
abstractNote = {Tensile and compressive creep tests were performed at 300 °C on high-temperature Al–Cu–Mn–Zr (ACMZ) alloys with 6 wt% Cu (6Cu) and 9 wt% Cu (9Cu) to evaluate the effect on creep properties of micron-size θ-Al2Cu intergranular precipitates. For compressive creep, the increased volume fraction of θ-precipitates at grain boundaries (from ~0.7% in 6Cu to ~ 6% in 9Cu) does not affect deformation rates across the investigated stress range of 15–110 MPa, consistent with creep being controlled by submicron θ'-Al2Cu precipitates within grains, whose size and fractions are the same in both alloys. In contrast, for tensile creep, 9Cu creeps faster than 6Cu at stresses above 20 MPa, and this difference increases with the stress level. Additionally, this discrepancy between tensile and compressive creep behavior is explained by cavitation during tensile creep, which is favored by higher volume fraction and larger size of intergranular θ precipitates in 9Cu. Conversely, larger precipitates impede cavity linkage resulting in improved creep ductility of 9Cu as compared to 6Cu at 300 °C.},
doi = {10.1016/j.msea.2022.142946},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = -,
volume = 840,
place = {United States},
year = {Sat Mar 05 00:00:00 EST 2022},
month = {Sat Mar 05 00:00:00 EST 2022}
}
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