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

Gibbs, John W.; Tourret, Damien; Gibbs, Paul J.; Imhoff, Seth D.; Gibbs, Meghan Jane; Walker, Brandon A.; Fezzaa, Kamel; Clarke, Amy Jean

doi:10.1007/s11837-015-1646-7

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

Journal Article · Fri Sep 25 00:00:00 EDT 2015 · JOM. Journal of the Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-015-1646-7· OSTI ID:1329871

Gibbs, John W. ^[1]; Tourret, Damien ^[1]; Gibbs, Paul J. ^[1]; Imhoff, Seth D. ^[1]; Gibbs, Meghan Jane ^[1]; Walker, Brandon A. ^[1]; Fezzaa, Kamel ^[2]; Clarke, Amy Jean ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source

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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-06NA25396; AC02-06CH11357

OSTI ID:: 1329871

Alternate ID(s):: OSTI ID: 1362298

Report Number(s):: LA-UR--15-24719

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 1 Vol. 68; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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