TY - JOUR
T1 - Preferential penetration path of gallium into grain boundary in practical aluminium alloy
AU - Kobayashi, M.
AU - Toda, H.
AU - Uesugi, K.
AU - Ohgaki, T.
AU - Kobayashi, T.
AU - Takayama, Y.
AU - Ahn, B. G.
N1 - Funding Information:
We also would like to acknowledge support by the Grant-in-aid for Scientific Research from the Japan Society for the Promotion of Science under Contract No. 15560606 and 17360340.
PY - 2006/10/1
Y1 - 2006/10/1
N2 - The preferential penetration of a liquid metal along grain boundaries (GBs) in polycrystalline metals is a well-known phenomenon. Gallium-decorated GB networks in rolled aluminium alloys have been visualized three-dimensionally using the high-resolution synchrotron radiation computer tomography (SRCT). The distribution of gallium concentration along GBs was measured using X-ray absorption. Statistical correction for blurring was performed to raise accuracy of the measurement, and then compared with orientation mapping by the SEM/EBSP method on the surface of a tomographic specimen. The pancake-like grain microstructure formed by a rolling process causes the anisotropy of penetration direction. Although the gallium penetrated into high-angle GBs, all of the high-angle GBs are not necessarily decorated by the gallium. The reason for this may be explained by considering geometrically possible penetration paths that seem to be dependent on local grain arrangement and GB structure through each path. The dependence of the gallium concentration on the rotation axis of misorientation has been found along the high-angle GBs. Especially, GBs with a specific misorientation (〈221〉 as a misorientation axis) showed high gallium concentration.
AB - The preferential penetration of a liquid metal along grain boundaries (GBs) in polycrystalline metals is a well-known phenomenon. Gallium-decorated GB networks in rolled aluminium alloys have been visualized three-dimensionally using the high-resolution synchrotron radiation computer tomography (SRCT). The distribution of gallium concentration along GBs was measured using X-ray absorption. Statistical correction for blurring was performed to raise accuracy of the measurement, and then compared with orientation mapping by the SEM/EBSP method on the surface of a tomographic specimen. The pancake-like grain microstructure formed by a rolling process causes the anisotropy of penetration direction. Although the gallium penetrated into high-angle GBs, all of the high-angle GBs are not necessarily decorated by the gallium. The reason for this may be explained by considering geometrically possible penetration paths that seem to be dependent on local grain arrangement and GB structure through each path. The dependence of the gallium concentration on the rotation axis of misorientation has been found along the high-angle GBs. Especially, GBs with a specific misorientation (〈221〉 as a misorientation axis) showed high gallium concentration.
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U2 - 10.1080/14786430600710933
DO - 10.1080/14786430600710933
M3 - Article
AN - SCOPUS:33749053833
VL - 86
SP - 4351
EP - 4366
JO - Philosophical Magazine
JF - Philosophical Magazine
SN - 1478-6435
IS - 28
ER -