Cavitation-resistant intergranular precipitates enhance creep performance of θ'-strengthened Al-Cu based alloys
Abstract
Tensile and compressive creep properties of a quaternary Al-Cu-Mn-Zr (ACMZ) alloy and its commercial counterpart (Al-Cu-Mn-Zr with Ni, Co and Sb additions, RR350) are investigated at 300°C. At low stresses up to 30 MPa where diffusional creep dominates, creep resistance is the same in tension and compression and RR350 deforms more slowly than ACMZ, consistent with RR350 alloy's larger linear fraction of intergranular precipitates (Al7Cu2(NiFe) and Al9FeNi for RR350 vs. θ-Al2Cu for ACMZ) and a reduced fraction of precipitate-free zones near grain boundaries. At stresses between 30 and 80 MPa, dislocation creep with a stress exponent n ~ 3 becomes rate-limiting in compression, which is expected to be controlled by θ' precipitates within the grain bulk. By contrast, in tension, enhanced creep rate and higher apparent stress exponents are measured, consistent with cavitation at intergranular precipitates becoming increasingly dominant as the stress increases. In the dislocation creep regime, RR350 alloy is again more creep resistant than ACMZ alloy, which is related to three mechanisms (i) a reduced fraction of softer precipitate-free zones, (ii) more effective load transfer to intergranular precipitates, and (iii) reduced cavitation. A model for cavitation is applied to calculate tensile creep rates from compressive creep rates andmore »
- Authors:
-
[2];
[2];
- Northwestern Univ., Evanston, IL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (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; National Science Foundation (NSF); National Institutes of Health (NIH); USDOE
- OSTI Identifier:
- 1863293
- Alternate Identifier(s):
- OSTI ID: 1847000
- Grant/Contract Number:
- AC05-00OR22725; DMR-1720139; ECCS-2025633; S10OD026871
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 228; Journal Issue: -; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Al-Cu alloys; diffusional creep; dislocation creep; θ′ (Al2Cu) precipitates; intergranular precipitates; grain size
Citation Formats
Rakhmonov, Jovid U., Bahl, Sumit, Shyam, Amit, and Dunand, David C. Cavitation-resistant intergranular precipitates enhance creep performance of θ'-strengthened Al-Cu based alloys. United States: N. p., 2022.
Web. doi:10.1016/j.actamat.2022.117788.
Rakhmonov, Jovid U., Bahl, Sumit, Shyam, Amit, & Dunand, David C. Cavitation-resistant intergranular precipitates enhance creep performance of θ'-strengthened Al-Cu based alloys. United States. https://doi.org/10.1016/j.actamat.2022.117788
Rakhmonov, Jovid U., Bahl, Sumit, Shyam, Amit, and Dunand, David C. Wed .
"Cavitation-resistant intergranular precipitates enhance creep performance of θ'-strengthened Al-Cu based alloys". United States. https://doi.org/10.1016/j.actamat.2022.117788. https://www.osti.gov/servlets/purl/1863293.
@article{osti_1863293,
title = {Cavitation-resistant intergranular precipitates enhance creep performance of θ'-strengthened Al-Cu based alloys},
author = {Rakhmonov, Jovid U. and Bahl, Sumit and Shyam, Amit and Dunand, David C.},
abstractNote = {Tensile and compressive creep properties of a quaternary Al-Cu-Mn-Zr (ACMZ) alloy and its commercial counterpart (Al-Cu-Mn-Zr with Ni, Co and Sb additions, RR350) are investigated at 300°C. At low stresses up to 30 MPa where diffusional creep dominates, creep resistance is the same in tension and compression and RR350 deforms more slowly than ACMZ, consistent with RR350 alloy's larger linear fraction of intergranular precipitates (Al7Cu2(NiFe) and Al9FeNi for RR350 vs. θ-Al2Cu for ACMZ) and a reduced fraction of precipitate-free zones near grain boundaries. At stresses between 30 and 80 MPa, dislocation creep with a stress exponent n ~ 3 becomes rate-limiting in compression, which is expected to be controlled by θ' precipitates within the grain bulk. By contrast, in tension, enhanced creep rate and higher apparent stress exponents are measured, consistent with cavitation at intergranular precipitates becoming increasingly dominant as the stress increases. In the dislocation creep regime, RR350 alloy is again more creep resistant than ACMZ alloy, which is related to three mechanisms (i) a reduced fraction of softer precipitate-free zones, (ii) more effective load transfer to intergranular precipitates, and (iii) reduced cavitation. A model for cavitation is applied to calculate tensile creep rates from compressive creep rates and the model successfully predicts the improved tensile creep resistance of the RR350 alloy. Overall, the present investigation underscores the importance of intergranular grain boundary precipitates, in addition to strengthening θ' precipitates, in enhancing the creep resistance of Al-Cu alloys.},
doi = {10.1016/j.actamat.2022.117788},
journal = {Acta Materialia},
number = -,
volume = 228,
place = {United States},
year = {Wed Feb 23 00:00:00 EST 2022},
month = {Wed Feb 23 00:00:00 EST 2022}
}
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