The effects of microstructural stability on the compressive response of two cast aluminum alloys up to 300 °C
Abstract
Here in this study, the high temperature compressive response of cast aluminum alloys 319 and RR350 is compared in light of their microstructures. The 319 alloy is widely used in thermally critical automotive applications and provides a baseline for comparison with the RR350 alloy, whose microstructural stability at high homologous temperatures was recently reported. Cylindrical compression samples from each alloy were tested at four temperatures up to 300 °C at a constant true strain rate that was varied over four orders of magnitude. Although both alloys are strengthened by metastable precipitates (nominally Al2Cu) in the as-aged condition, their mechanical response diverges at temperatures greater than 250 °C as the strengthening precipitates evolve in the 319 alloy and retain their as-aged morphology in the RR350 alloy. Deformation mechanisms of each alloy are examined using microstructural analysis and empirical activation energy calculations. The stability of the θ' phase in the RR350 alloy leads to effective precipitation hardening at homologous temperatures up to 0.6 and an extensive regime of grain boundary controlled deformation.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research and Graduate Education
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Indian Inst. of Technology (IIT), Kharagpur (India). Materials Science Center
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- Work for Others (WFO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
- OSTI Identifier:
- 1366385
- Alternate Identifier(s):
- OSTI ID: 1495821
- Grant/Contract Number:
- AC05-00OR22725; DE‐AC05‐00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Additional Journal Information:
- Journal Volume: 700; Journal Issue: C; Journal ID: ISSN 0921-5093
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Cast Aluminum; Elevated Temperature Mechanical Properties; Thermal Phase Stability
Citation Formats
Shower, Patrick T., Roy, Shibayan, Hawkins, Charles Shane, and Shyam, Amit. The effects of microstructural stability on the compressive response of two cast aluminum alloys up to 300 °C. United States: N. p., 2017.
Web. doi:10.1016/j.msea.2017.06.024.
Shower, Patrick T., Roy, Shibayan, Hawkins, Charles Shane, & Shyam, Amit. The effects of microstructural stability on the compressive response of two cast aluminum alloys up to 300 °C. United States. https://doi.org/10.1016/j.msea.2017.06.024
Shower, Patrick T., Roy, Shibayan, Hawkins, Charles Shane, and Shyam, Amit. Thu .
"The effects of microstructural stability on the compressive response of two cast aluminum alloys up to 300 °C". United States. https://doi.org/10.1016/j.msea.2017.06.024. https://www.osti.gov/servlets/purl/1366385.
@article{osti_1366385,
title = {The effects of microstructural stability on the compressive response of two cast aluminum alloys up to 300 °C},
author = {Shower, Patrick T. and Roy, Shibayan and Hawkins, Charles Shane and Shyam, Amit},
abstractNote = {Here in this study, the high temperature compressive response of cast aluminum alloys 319 and RR350 is compared in light of their microstructures. The 319 alloy is widely used in thermally critical automotive applications and provides a baseline for comparison with the RR350 alloy, whose microstructural stability at high homologous temperatures was recently reported. Cylindrical compression samples from each alloy were tested at four temperatures up to 300 °C at a constant true strain rate that was varied over four orders of magnitude. Although both alloys are strengthened by metastable precipitates (nominally Al2Cu) in the as-aged condition, their mechanical response diverges at temperatures greater than 250 °C as the strengthening precipitates evolve in the 319 alloy and retain their as-aged morphology in the RR350 alloy. Deformation mechanisms of each alloy are examined using microstructural analysis and empirical activation energy calculations. The stability of the θ' phase in the RR350 alloy leads to effective precipitation hardening at homologous temperatures up to 0.6 and an extensive regime of grain boundary controlled deformation.},
doi = {10.1016/j.msea.2017.06.024},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 700,
place = {United States},
year = {Thu Jun 08 00:00:00 EDT 2017},
month = {Thu Jun 08 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
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