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Title: Determination of crystal growth rates during rapid solidification of polycrystalline aluminum by nano-scale spatio-temporal resolution in situ transmission electron microscopy

Abstract

In situ investigations of rapid solidification in polycrystalline Al thin films were conducted using nano-scale spatio-temporal resolution dynamic transmission electron microscopy. Differences in crystal growth rates and asymmetries in melt pool development were observed as the heat extraction geometry was varied by controlling the proximity of the laser-pulse irradiation and the associated induced melt pools to the edge of the transmission electron microscopy support grid, which acts as a large heat sink. Experimental parameters have been established to maximize the reproducibility of the material response to the laser-pulse-related heating and to ensure that observations of the dynamical behavior of the metal are free from artifacts, leading to accurate interpretations and quantifiable measurements with improved precision. Interface migration rate measurements revealed solidification velocities that increased consistently from ~1.3 m s –1 to ~2.5 m s –1 during the rapid solidification process of the Al thin films. Under the influence of an additional large heat sink, increased crystal growth rates as high as 3.3 m s –1 have been measured. The in situ experiments also provided evidence for development of a partially melted, two-phase region prior to the onset of rapid solidification facilitated crystal growth. As a result, using the experimental observationsmore » and associated measurements as benchmarks, finite-element modeling based calculations of the melt pool evolution after pulsed laser irradiation have been performed to obtain estimates of the temperature evolution in the thin films.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [3]
  1. Univ. of Pittsburgh, Pittsburgh, PA (United States); Swiss Federal Lab. for Materials Science and Technology, Duebendorf (Switzerland)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Ecole Polytechnique Federale de Lausanne (Lausanne)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)l; Integrated Dynamic Electron Solutions, Pleasanton, CA (United States)
  6. Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1313560
Alternate Identifier(s):
OSTI ID: 1282415
Report Number(s):
LLNL-JRNL-676422
Journal ID: ISSN 0021-8979; JAPIAU
Grant/Contract Number:  
AC52-07NA27344; FWP SCW0974
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 5; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; solidification; transmission electron microscopy; liquid thin films; liquid solid interfaces; crystal growth

Citation Formats

Zweiacker, K., McKeown, J. T., Liu, C., LaGrange, T., Reed, B. W., Campbell, G. H., and Wiezorek, J. M. K. Determination of crystal growth rates during rapid solidification of polycrystalline aluminum by nano-scale spatio-temporal resolution in situ transmission electron microscopy. United States: N. p., 2016. Web. doi:10.1063/1.4960443.
Zweiacker, K., McKeown, J. T., Liu, C., LaGrange, T., Reed, B. W., Campbell, G. H., & Wiezorek, J. M. K. Determination of crystal growth rates during rapid solidification of polycrystalline aluminum by nano-scale spatio-temporal resolution in situ transmission electron microscopy. United States. doi:10.1063/1.4960443.
Zweiacker, K., McKeown, J. T., Liu, C., LaGrange, T., Reed, B. W., Campbell, G. H., and Wiezorek, J. M. K. Thu . "Determination of crystal growth rates during rapid solidification of polycrystalline aluminum by nano-scale spatio-temporal resolution in situ transmission electron microscopy". United States. doi:10.1063/1.4960443. https://www.osti.gov/servlets/purl/1313560.
@article{osti_1313560,
title = {Determination of crystal growth rates during rapid solidification of polycrystalline aluminum by nano-scale spatio-temporal resolution in situ transmission electron microscopy},
author = {Zweiacker, K. and McKeown, J. T. and Liu, C. and LaGrange, T. and Reed, B. W. and Campbell, G. H. and Wiezorek, J. M. K.},
abstractNote = {In situ investigations of rapid solidification in polycrystalline Al thin films were conducted using nano-scale spatio-temporal resolution dynamic transmission electron microscopy. Differences in crystal growth rates and asymmetries in melt pool development were observed as the heat extraction geometry was varied by controlling the proximity of the laser-pulse irradiation and the associated induced melt pools to the edge of the transmission electron microscopy support grid, which acts as a large heat sink. Experimental parameters have been established to maximize the reproducibility of the material response to the laser-pulse-related heating and to ensure that observations of the dynamical behavior of the metal are free from artifacts, leading to accurate interpretations and quantifiable measurements with improved precision. Interface migration rate measurements revealed solidification velocities that increased consistently from ~1.3 m s–1 to ~2.5 m s–1 during the rapid solidification process of the Al thin films. Under the influence of an additional large heat sink, increased crystal growth rates as high as 3.3 m s–1 have been measured. The in situ experiments also provided evidence for development of a partially melted, two-phase region prior to the onset of rapid solidification facilitated crystal growth. As a result, using the experimental observations and associated measurements as benchmarks, finite-element modeling based calculations of the melt pool evolution after pulsed laser irradiation have been performed to obtain estimates of the temperature evolution in the thin films.},
doi = {10.1063/1.4960443},
journal = {Journal of Applied Physics},
number = 5,
volume = 120,
place = {United States},
year = {Thu Aug 04 00:00:00 EDT 2016},
month = {Thu Aug 04 00:00:00 EDT 2016}
}

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Works referenced in this record:

Approaches for ultrafast imaging of transient materials processes in the transmission electron microscope
journal, November 2012


Nanosecond time-resolved investigations using the in situ of dynamic transmission electron microscope (DTEM)
journal, October 2008