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Title: In Situ X-Ray Observations of Dendritic Fragmentation During Directional Solidification of a Sn-Bi Alloy

Dendrite fragmentation is an important phenomenon in microstructural development during solidification. For instance, it plays a key role in initiating the columnar-to-equiaxed transition (CET). In this paper, we use x-ray radiography to study dendrite fragmentation rate in a Sn-39.5 wt.% Bi alloy during directional solidification. Experiments were performed in which solidification was parallel and anti-parallel to gravity, leading to significantly different fragmentation rates. We quantify the distribution of fragmentation rate as a function of distance from the solidification front, time in the mushy zone, and volume fraction of solid. Finally, while the observed fragmentation rate can be high, there is no evidence of a CET, illustrating that it requires more than just fragmentation to occur.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
Publication Date:
Report Number(s):
LA-UR-15-24719
Journal ID: ISSN 1047-4838
Grant/Contract Number:
AC52-06NA25396; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of The Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 68; Journal Issue: 1; Journal ID: ISSN 1047-4838
Publisher:
Springer
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1329871

Gibbs, John W., Tourret, Damien, Gibbs, Paul J., Imhoff, Seth D., Gibbs, Meghan Jane, Walker, Brandon A., Fezzaa, Kamel, and Clarke, Amy Jean. In Situ X-Ray Observations of Dendritic Fragmentation During Directional Solidification of a Sn-Bi Alloy. United States: N. p., Web. doi:10.1007/s11837-015-1646-7.
Gibbs, John W., Tourret, Damien, Gibbs, Paul J., Imhoff, Seth D., Gibbs, Meghan Jane, Walker, Brandon A., Fezzaa, Kamel, & Clarke, Amy Jean. In Situ X-Ray Observations of Dendritic Fragmentation During Directional Solidification of a Sn-Bi Alloy. United States. doi:10.1007/s11837-015-1646-7.
Gibbs, John W., Tourret, Damien, Gibbs, Paul J., Imhoff, Seth D., Gibbs, Meghan Jane, Walker, Brandon A., Fezzaa, Kamel, and Clarke, Amy Jean. 2015. "In Situ X-Ray Observations of Dendritic Fragmentation During Directional Solidification of a Sn-Bi Alloy". United States. doi:10.1007/s11837-015-1646-7. https://www.osti.gov/servlets/purl/1329871.
@article{osti_1329871,
title = {In Situ X-Ray Observations of Dendritic Fragmentation During Directional Solidification of a Sn-Bi Alloy},
author = {Gibbs, John W. and Tourret, Damien and Gibbs, Paul J. and Imhoff, Seth D. and Gibbs, Meghan Jane and Walker, Brandon A. and Fezzaa, Kamel and Clarke, Amy Jean},
abstractNote = {Dendrite fragmentation is an important phenomenon in microstructural development during solidification. For instance, it plays a key role in initiating the columnar-to-equiaxed transition (CET). In this paper, we use x-ray radiography to study dendrite fragmentation rate in a Sn-39.5 wt.% Bi alloy during directional solidification. Experiments were performed in which solidification was parallel and anti-parallel to gravity, leading to significantly different fragmentation rates. We quantify the distribution of fragmentation rate as a function of distance from the solidification front, time in the mushy zone, and volume fraction of solid. Finally, while the observed fragmentation rate can be high, there is no evidence of a CET, illustrating that it requires more than just fragmentation to occur.},
doi = {10.1007/s11837-015-1646-7},
journal = {Journal of The Minerals, Metals & Materials Society},
number = 1,
volume = 68,
place = {United States},
year = {2015},
month = {9}
}