Dislocation-θ' (Al2Cu) interactions during creep deformation of an Al-Cu alloy

Milligan, Brian; Ma, Dong; Allard, Lawrence; Clarke, Amy; Shyam, Amit

doi:10.1016/j.scriptamat.2022.114739

Dislocation-θ' (Al2Cu) interactions during creep deformation of an Al-Cu alloy

Journal Article · Sun May 08 00:00:00 EDT 2022 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2022.114739· OSTI ID:1867787

^[1]; ^[2]; ^[3]; Clarke, Amy ^[4]; ^[3]

Colorado School of Mines, Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Songshan Lake Materials Laboratory, Guangdong (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Colorado School of Mines, Golden, CO (United States)

While precipitate-dislocation interactions are well-understood for Al-Cu alloys in tension, creep behavior has seen far less study. New, thermally-stabilized Al-Cu alloys have θ' (Al₂Cu) as strengthening precipitates that remain stable up to 300 °C (~60% of the melting temperature) and higher, where creep becomes essential to the mechanical behavior. This investigation identifies the precipitate-dislocation interactions in such an Al-Cu alloy using in-situ neutron diffraction and scanning transmission electron microscopy. Significant load transfer to the θ' precipitates occurs, which can be attributed to dislocation loops on the interfaces of θ' and the Al matrix. Thus, Orowan looping is identified to be the primary activity for precipitate-dislocation interactions. As Orowan looping and load transfer are associated with significant strain hardening, these results explain the excellent creep resistance seen in this alloy, and provide insights into the design of precipitation strengthened alloys with superior creep performance.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1867787

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: August Vol. 217; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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