The many faces of θ'-Al2Cu precipitates: Energetics of pristine and solute segregated Al/θ' semi-coherent interfaces

Shin, Dongwon; Poplawsky, Jonathan D.; Chisholm, Matthew F.; Allard, Jr., Lawrence F.; Haynes, James Allen; Shyam, Amit

doi:10.1016/j.actamat.2024.120444

The many faces of θ'-Al₂Cu precipitates: Energetics of pristine and solute segregated Al/θ' semi-coherent interfaces

Journal Article · Wed Oct 02 00:00:00 EDT 2024 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2024.120444· OSTI ID:2474760

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Tennessee, Knoxville, TN (United States)

θ'-Al₂Cu precipitates in Al-Cu alloys have various distorted octagon shapes, which can be explained by the competition between {100} and {110} type semi-coherent interfaces with the Al matrix. While most prior studies on the semi-coherent Al/θ' interfaces have focused on the {100} orientation, little is known about the {110} interface. We have investigated the energetics of pristine and solute-segregated {110} semi-coherent Al/θ' interfaces with advanced characterization and first-principles studies. We report interfacial, strain, and solute segregation energetics of the {110} Al/θ' semi-coherent interface for 39 elements and compared them with previously reported values of the {100} interface. We discuss the atomic features and atomic local structures to identify similarities and differences between the two types of Al/θ' semi-coherent interfaces. Here, the isotropy in pristine Al/θ' semi-coherent interfacial energy and the anisotropy resulting from solute segregation provide insight into the formation of different types of θ' precipitate “faces” reported in the literature.

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); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2474760

Alternate ID(s):: OSTI ID: 2459388

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 281; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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The many faces of θ'-Al2Cu precipitates: Energetics of pristine and solute segregated Al/θ' semi-coherent interfaces

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The many faces of θ'-Al₂Cu precipitates: Energetics of pristine and solute segregated Al/θ' semi-coherent interfaces