Grain-boundary structure effects on intergranular stress corrosion cracking of Alloy X-750
Grain-boundary structure effects on intergranular stress corrosion cracking of Alloy X-750
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DOI：
10.1016/s1359-6454(96)00125-5
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发表时间：
1996-12-01
期刊：
影响因子：
9.4
通讯作者：
Panayotou, N
中科院分区：
文献类型：
--
作者：
Pan, Y;Adams, BL;Panayotou, N
众所周知，晶界的性质和行为受到局域化学和原子结构的强烈影响。本文主要研究了X-750合金晶界结构的细观描述及其与晶间应力腐蚀开裂的关系。取向成像显微镜与连续抛光相结合，用来揭示细观结构和晶界网络的连通性。开裂倾向与晶界几何形状的重合格子(CSL)分类以及晶界平面取向的信息相关联。对数据的解释表明，低CSL边界(由更严格的Palumbo-Aust准则定义)、小角度边界和具有平面法线的一般边界远离主应力轴。具有较低的开裂易损性。版权所有(C)1996 Acta Metallurica Inc.
It is well known that the properties and behavior of grain boundaries are strongly affected by local chemistry and atomic structure. This paper focuses on the mesoscale description of grain boundary structure (i.e. the five crystallographic degrees of freedom) and correlations with intergranular stress corrosion cracking observed in Alloy X-750. Orientation imaging microscopy, coupled with serial polishing, is used to reveal mesoscale structure and the connectivity of the grain boundary network. The propensity for cracking is correlated with the coincident site lattice (CSL) classification of grain boundary geometry, coupled with information about the orientation of the grain boundary plane. The data is interpreted to show that low-CSL boundaries (defined by the more restrictive Palumbo-Aust criterion), low-angle boundaries, and general boundaries with plane normals well off the principal stress axis. have low vulnerability to cracking. Copyright (C) 1996 Acta Metallurgica Inc.