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


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Article Info

DATE

2016-01-27

AUTHORS

Joseph T. McKeown, Kai Zweiacker, Can Liu, Daniel R. Coughlin, Amy J. Clarke, J. Kevin Baldwin, John W. Gibbs, John D. Roehling, Seth D. Imhoff, Paul J. Gibbs, Damien Tourret, Jörg M. K. Wiezorek, Geoffrey H. Campbell

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. These time-resolved in situ measurements can inform and validate predictive modeling efforts for AM. More... »

PAGES

985-999

References to SciGraph publications

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    31 Cu alloy
    32 Hypoeutectic thin-film Al–Cu
    33 additive manufacturing
    34 alloy
    35 alloy solidification
    36 challenges
    37 composition
    38 differences
    39 dynamic transmission electron microscopy
    40 efforts
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    42 environment
    43 evolution
    44 experimental insights
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    46 images
    47 implementation
    48 industrial environment
    49 insights
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    51 interface
    52 interface velocity
    53 investigation
    54 kinetics
    55 manufacturing
    56 measurements
    57 metals
    58 microscopy
    59 microsecond timescale
    60 microstructure evolution
    61 modeling efforts
    62 morphological instability
    63 observed microstructure evolution
    64 pervasive technologies
    65 predictive modeling efforts
    66 presence
    67 processing
    68 products
    69 properties
    70 rapid alloy solidification
    71 rapid solidification
    72 research
    73 resolution
    74 significant challenge
    75 situ investigation
    76 situ measurements
    77 small differences
    78 solid-liquid interface
    79 solid-liquid interface velocity
    80 solidification
    81 solidification front
    82 solidification products
    83 technology
    84 temporal resolution
    85 thermophysical properties
    86 thin-film Al–Cu
    87 time-resolved images
    88 timescales
    89 transmission electron microscopy
    90 unique experimental insights
    91 velocity
    92 widespread implementation
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