Interface velocity dependent solute trapping and phase selection during rapid solidification of laser melted hypo-eutectic Al-11at.%Cu alloy

Bathula, Vishwanadh; Liu, Can; Zweiacker, Kai; McKeown, Joseph; Wiezorek, Jörg M.K.

doi:10.1016/j.actamat.2020.04.006

Title: Interface velocity dependent solute trapping and phase selection during rapid solidification of laser melted hypo-eutectic Al-11at.%Cu alloy

Journal Article · Wed Jun 03 00:00:00 EDT 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.04.006· OSTI ID:1716591

Bathula, Vishwanadh ^[1]; Liu, Can ^[2];

^[3];

^[4];

^[2]

Univ. of Pittsburgh, PA (United States); Bhabha Atomic Research Centre, Mumbai (India)
Univ. of Pittsburgh, PA (United States)
Univ. of Pittsburgh, PA (United States); Empa-Swiss Federal Lab. for Materials Science and Technology, Dubendorf (Switzerland)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Microstructure formation of a hypo-eutectic Al-11Cu (atom percent) alloy during solidification after laser melting has been studied by transmission electron microscopy (TEM). The evolution of the solid-liquid-interface velocity, V_SL, during the solidification process has been determined from direct observation by in-situ TEM. This enabled correlating V_SL with development of four distinct microstructure zones. Crystal growth mode transitions from planar to cellular, cellular to dendritic, dendritic to cellular, and cellular to planar, have been observed for the accelerating solid-liquid-interface. The transition from coupled two-phase growth to the single-phase growth occurred for V_SL = V_a = (0.80±0.05) m/s, where V_a is the velocity of absolute stability, at the onset of banded morphology grain formation. The in-situ and post-mortem TEM uniquely permitted determination of the non-equilibrium solidus for the rapidly solidifying Al-11Cu alloy. Experimental evidence for solute clustering and chemical ordering tendencies at length scales on the order of ≤ 5nm has been detected in the single-phase regions of the banded grains. The structural features of the single-phase bands have been interpreted as signatures of ‘frozen in’ configurations present in the liquid boundary layer adjacent to the growing crystal, which has a width of about 3nm. Finally, the nano-scale spatiotemporal resolution experimental TEM studies performed here provided quantitative metrics, e.g. the solidification interface velocity dependent solute concentration of the α-Al phase and the near-atomic scale structure in the single-phase bands, that are uniquely suitable for comparison with theory and model predictions for solidification microstructure development in multicomponent alloys after laser melting.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)

Grant/Contract Number:: AC52-07NA27344; DMR1607922; FWP SCW0974

OSTI ID:: 1716591

Alternate ID(s):: OSTI ID: 1633338

Report Number(s):: LLNL-JRNL-799626; 1002143

Journal Information:: Acta Materialia, Vol. 195; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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