On the orientation dependence of grain boundary triple line energy in Cu
On the orientation dependence of grain boundary triple line energy in Cu
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DOI：
10.3139/146.111138
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发表时间：
2014-12
影响因子：
0.8
通讯作者：
Bingbing Zhao;L. Shvindlerman;G. Gottstein
中科院分区：
文献类型：
--
作者：
Bingbing Zhao;L. Shvindlerman;G. Gottstein
摘要 三重线是块体材料的三个界面（外部界面或内部界面）的相交线。它们已被认为是具有特定动力学和热力学性质的重要微观结构特征。利用原子力显微镜，测定了铜中不同晶系的线张力，即无晶界表面三重线和晶界三重结的能量。发现铜中晶界三联结的线张力为正，约为 10−9 J m−1。包括低能量边界、孪晶边界和低角度边界的结显示出比仅由随机高角度边界组成的三重结低得多的线张力。提出了一种基于恒定晶界能量密度的简单模型来解释三线能量的取向依赖性。
Abstract Triple lines are the lines of intersection of three interfaces, either external interfaces or internal interfaces of a bulk material. They have been recognized as important microstructural features with specific kinetic and thermodynamic properties. Utilizing atomic force microscopy, the line tensions, i.e. the energy of grain boundary-free surface triple lines and grain boundary triple junctions for different crystallographic systems in copper were determined. The line tension of grain boundary triple junctions in copper was found to be positive and of the order of 10−9 J m−1. Junctions including low energy boundaries, twin boundaries and low angle boundaries revealed a substantially lower line tension than triple junctions comprised only of random high angle boundaries. A simple model based on a constant grain boundary energy density is proposed to account for the orientation dependence of triple line energy.