Atomic structures of interfacial solute gateways to θ' precipitates in Al-Cu alloys

Chisholm, Matthew; Shin, Dongwon; Duscher, Gerd; Oxley, Mark P.; Allard Jr, Lawrence F.; Poplawsky, Jonathan D.; Shyam, Amit

doi:10.1016/j.actamat.2021.116891

Atomic structures of interfacial solute gateways to θ' precipitates in Al-Cu alloys

Journal Article · Thu Apr 22 00:00:00 EDT 2021 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2021.116891· OSTI ID:1807286

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

Many materials employed in critical structural applications depend upon metastable strengthening precipitates that transform or dissolve at elevated temperatures. Herein, aberration-corrected scanning transmission electron microscopy and first-principles calculations are used to accurately determine the atomic structure of the highly mobile, semi-coherent precipitate interfaces that control this process in the classic θ' (Al₂Cu) precipitate in the Al-Cu system. Semi-coherent {110} interfaces are found to be composed of an array of unexpected misfit dislocations that are arranged in two different structural units. Dislocations accommodate nearly all of the misfit between the Al matrix and strengthening phase. Cu is observed to segregate to the compressed edge of the dislocation cores at specific sites in this interface. First-principles calculations revealed the energetic landscape that facilitates these sites to become entry and exit gateways of Cu atoms in this semi-coherent interface. In conclusion, this investigation reveals critical features within semi-coherent interfaces that determine the thermal stability of precipitation-hardened alloys.

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); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1807286

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: NA Vol. 212; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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