【摘要】 用干涉显微镜研究了具有对称倾斜晶界的Nb双晶的晶界腐蚀。除了在靠近重合位置点阵(CSL)晶界处出现极小值外,腐蚀深度d是随位向差θ的增大而增加的。对小角度晶界,d随θ的变化遵循Read—Shockley关系。用计算机模拟方法计算了晶界的原子结构及其局部膨胀,用自由体积的变化解释了晶界腐蚀的结构依赖性。更多还原

【Abstract】 Grain boundary corrosion of oriented Nb bicrystals with symmetric tiltboundaries has been investigated by use of interference microscope. The corrosion depth, d,increases with misorientation angle, θ, except near some coincidence-site-lattice boundarieswhere minimum cusps appear. For small-angle boundaries, d depends on θ following aRead-Shockley type relationship. The atomistic structure and the local expansion of grainboundaries were calculated using a computer simulation method. The structure dependence ofgrain boundary corrosion is explained in terms of variation in free volume.更多还原