方向错误
镓
材料科学
铝
渗透(战争)
微晶
晶界
微观结构
空位缺陷
结晶学
冶金
化学
运筹学
工程类
作者
Masakazu Kobayashi,Hiroyuki Toda,Kentaro Uesugi,Tomomi Ohgaki,Toshiro Kobayashi,Yoshihisa Takayama,Byung-Guk Ahn
标识
DOI:10.1080/14786430600710933
摘要
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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