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Title: Time-Resolved In Situ Measurements During Rapid Alloy Solidification: Experimental Insight for Additive Manufacturing

Abstract

Additive manufacturing (AM) of metals and alloys is becoming a pervasive technology in both research and industrial environments, though significant challenges remain before widespread implementation of AM can be realized. In situ investigations of rapid alloy solidification with high spatial and temporal resolutions can provide unique experimental insight into microstructure evolution and kinetics that are relevant for AM processing. Hypoeutectic thin-film Al–Cu and Al–Si alloys were investigated using dynamic transmission electron microscopy to monitor pulsed-laser-induced rapid solidification across microsecond timescales. Solid–liquid interface velocities measured from time-resolved images revealed accelerating solidification fronts in both alloys. The observed microstructure evolution, solidification product, and presence of a morphological instability at the solid–liquid interface in the Al–4 at.%Cu alloy are related to the measured interface velocities and small differences in composition that affect the thermophysical properties of the alloys. As a result, these time-resolved in situ measurements can inform and validate predictive modeling efforts for AM.

Authors:
 [1];  [2];  [2];  [3];  [3];  [3];  [3];  [1];  [3];  [3];  [3];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Pittsburgh, PA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1258521
Alternate Identifier(s):
OSTI ID: 1321772
Report Number(s):
LLNL-JRNL-679624; LA-UR-15-29122
Journal ID: ISSN 1047-4838
Grant/Contract Number:  
AC52-07NA27344; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 68; Journal Issue: 3; Journal ID: ISSN 1047-4838
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

McKeown, Joseph T., Zweiacker, Kai, Liu, Can, Coughlin, Daniel R., Clarke, Amy J., Baldwin, J. Kevin, Gibbs, John W., Roehling, John D., Imhoff, Seth D., Gibbs, Paul J., Tourret, Damien, Wiezorek, Jörg M. K., and Campbell, Geoffrey H. Time-Resolved In Situ Measurements During Rapid Alloy Solidification: Experimental Insight for Additive Manufacturing. United States: N. p., 2016. Web. doi:10.1007/s11837-015-1793-x.
McKeown, Joseph T., Zweiacker, Kai, Liu, Can, Coughlin, Daniel R., Clarke, Amy J., Baldwin, J. Kevin, Gibbs, John W., Roehling, John D., Imhoff, Seth D., Gibbs, Paul J., Tourret, Damien, Wiezorek, Jörg M. K., & Campbell, Geoffrey H. Time-Resolved In Situ Measurements During Rapid Alloy Solidification: Experimental Insight for Additive Manufacturing. United States. https://doi.org/10.1007/s11837-015-1793-x
McKeown, Joseph T., Zweiacker, Kai, Liu, Can, Coughlin, Daniel R., Clarke, Amy J., Baldwin, J. Kevin, Gibbs, John W., Roehling, John D., Imhoff, Seth D., Gibbs, Paul J., Tourret, Damien, Wiezorek, Jörg M. K., and Campbell, Geoffrey H. Wed . "Time-Resolved In Situ Measurements During Rapid Alloy Solidification: Experimental Insight for Additive Manufacturing". United States. https://doi.org/10.1007/s11837-015-1793-x. https://www.osti.gov/servlets/purl/1258521.
@article{osti_1258521,
title = {Time-Resolved In Situ Measurements During Rapid Alloy Solidification: Experimental Insight for Additive Manufacturing},
author = {McKeown, Joseph T. and Zweiacker, Kai and Liu, Can and Coughlin, Daniel R. and Clarke, Amy J. and Baldwin, J. Kevin and Gibbs, John W. and Roehling, John D. and Imhoff, Seth D. and Gibbs, Paul J. and Tourret, Damien and Wiezorek, Jörg M. K. and Campbell, Geoffrey H.},
abstractNote = {Additive manufacturing (AM) of metals and alloys is becoming a pervasive technology in both research and industrial environments, though significant challenges remain before widespread implementation of AM can be realized. In situ investigations of rapid alloy solidification with high spatial and temporal resolutions can provide unique experimental insight into microstructure evolution and kinetics that are relevant for AM processing. Hypoeutectic thin-film Al–Cu and Al–Si alloys were investigated using dynamic transmission electron microscopy to monitor pulsed-laser-induced rapid solidification across microsecond timescales. Solid–liquid interface velocities measured from time-resolved images revealed accelerating solidification fronts in both alloys. The observed microstructure evolution, solidification product, and presence of a morphological instability at the solid–liquid interface in the Al–4 at.%Cu alloy are related to the measured interface velocities and small differences in composition that affect the thermophysical properties of the alloys. As a result, these time-resolved in situ measurements can inform and validate predictive modeling efforts for AM.},
doi = {10.1007/s11837-015-1793-x},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 3,
volume = 68,
place = {United States},
year = {Wed Jan 27 00:00:00 EST 2016},
month = {Wed Jan 27 00:00:00 EST 2016}
}

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