Microstructural evolution of rapidly solidified hypoeutectic Al 10Cu alloy during non-isothermal annealing transients induced by nano-second laser pulses

Vishwanadh, B.; McKeown, J. T.; Wiezorek, J. M.K.

doi:10.1016/j.matchar.2023.113608

Title: Microstructural evolution of rapidly solidified hypoeutectic Al 10Cu alloy during non-isothermal annealing transients induced by nano-second laser pulses

Journal Article · 24 December 2023 · Materials Characterization

DOI: https://doi.org/10.1016/j.matchar.2023.113608 · OSTI ID:2335557

Vishwanadh, B. ^[1]; McKeown, J. T. ^[2]; Wiezorek, J. M.K. ^[3]

Swanson School of Engineering, Pittsburgh, PA (United States); Bhabha Atomic Research Centre, Mumbai (India)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States). Materials Science Division
Swanson School of Engineering, Pittsburgh, PA (United States)

The evolution of characteristic nonequilibrium features presenting in morphologically distinct regions of rapid solidification (RS) microstructures in a hypoeutectic Al—10Cu (atomic %) in response to non-isothermal annealing transients has been studied by transmission electron microscopy (TEM). The capabilities of the Movie-Mode Dynamic TEM (MM-DTEM) instrument were used to expose select regions of the RS microstructure to sequences of rapid heating and cooling transients induced by nanosecond laser pulses while permitting in-situ observation. Partial melting, microstructural scale coarsening, morphological changes of the nonequilibrium features in the multi-phase RS microstructure, and solid-state phase transformation were observed. Heterogeneous nucleation of nanoscale θ-Al₂Cu phase involved metastable supersaturated α-Al and the θ'-Al₂Cu phases, establishing different sets of orientation relationships for the stable θ-Al₂Cu and α-Al phases. Replacement of banded morphology grains that formed under conditions driven farthest from equilibrium by an equiaxed nanocrystalline structure comprised of α-Al phase, the primary solidification product, and an intergranular network of Al₂Cu crystals has been attributed to local remelting. Here the experimental approach explored, permitted discovery of mechanistic details of location-specific transformation pathways activated in the multi-phase RS microstructure of hypoeutectic Al—Cu during subsequent nonisothermal transients.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2335557

Report Number(s):: LLNL--JRNL-859011; 1089820

Journal Information:: Materials Characterization, Journal Name: Materials Characterization Journal Issue: N/A Vol. 207; ISSN 1044-5803

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Microstructural evolution of rapidly solidified hypoeutectic Al 10Cu alloy during non-isothermal annealing transients induced by nano-second laser pulses

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