High-pressure phase transitions in a laser directed energy deposited Fe-33Cu Alloy

Yin, Daniel; Sahu, Bibhu Prasad; Tsurkan, Phillip; Popov, Dmitry; Dongare, Avinash M.; Velisavljevic, Nenad; Misra, Amit

doi:10.1016/j.actamat.2024.119797

High-pressure phase transitions in a laser directed energy deposited Fe-33Cu Alloy

Journal Article · Sun Feb 25 23:00:00 EST 2024 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2024.119797· OSTI ID:2403432

^[1]; ^[1]; ^[2]; ^[3]; Dongare, Avinash M. ^[2]; Velisavljevic, Nenad ^[4]; Misra, Amit ^[1]

University of Michigan, Ann Arbor, MI (United States)
University of Connecticut, Storrs, CT (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT)
Argonne National Laboratory (ANL), Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Here, additively manufactured Fe-Cu alloys contain both equilibrium face-centered cubic (FCC) and metastable body-centered cubic (BCC) crystal structure Cu precipitates depending on their size. However, the stability of these nanoscale precipitates under extreme conditions such as high pressures has not been reported. This study investigates the phase transformations and microstructural stability of laser directed energy deposition (DED-LB) made Fe67Cu33 alloy (nominal composition in at.%) under high static pressure deformation using in-situ synchrotron X-ray diffraction under pressure, postmortem high-resolution scanning transmission electron microscopy (HR-STEM), and molecular dynamics (MD) simulations. In-situ XRD results reveal a reversible phase transformation from BCC to the hexagonal close-packed (HCP) structure in the Fe grains at an onset pressure of 16.4 GPa, significantly higher than reported in the literature for pure Fe. Although no high-pressure phase transition was observed in the FCC Cu grains through XRD, HR-STEM analysis uncovers a phase transition to the HCP structure in nanoscale metastable BCC Cu precipitates within the BCC Fe matrix. After decompression, the Fe matrix reverted back to the BCC structure with periodic lath martensite, while regions of the nanoscale BCC Cu precipitates retained the metastable HCP structure. MD simulations support the BCC → HCP transition in the embedded nanoscale coherent Cu precipitates, consistent with the classical Burgers mechanism. Thus, by leveraging in-situ XRD observation, postmortem high-resolution S/TEM microscopy, and MD simulations, this study offers profound insights into the distinctive phase transformations induced by high pressure in DED-LB Fe67Cu33 alloy, which is distinguished by its hierarchical microstructure.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Texas A&M University, College Station, TX (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0003857; AC02-06CH11357

OSTI ID:: 2403432

Report Number(s):: LLNL--JRNL-866761; 1100015

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 268; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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