The effects of microstructural stability on the compressive response of two cast aluminum alloys up to 300 °C

Shower, Patrick T.; Roy, Shibayan; Hawkins, Charles Shane; Shyam, Amit

doi:10.1016/j.msea.2017.06.024

Title: The effects of microstructural stability on the compressive response of two cast aluminum alloys up to 300 °C

Journal Article · Thu Jun 08 00:00:00 EDT 2017 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2017.06.024· OSTI ID:1366385

Shower, Patrick T. ^[1]; Roy, Shibayan ^[2]; Hawkins, Charles Shane ^[3]; Shyam, Amit ^[1]

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

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Work for Others (WFO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: AC05-00OR22725; DE‐AC05‐00OR22725

OSTI ID:: 1366385

Alternate ID(s):: OSTI ID: 1495821

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 700, Issue C; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Title: The effects of microstructural stability on the compressive response of two cast aluminum alloys up to 300 °C

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