Assessing the intergranular crack initiation probability of a grain boundary distribution by an experimental misalignment study of adjacent slip systems
Assessing the intergranular crack initiation probability of a grain boundary distribution by an experimental misalignment study of adjacent slip systems
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DOI：
10.1016/j.prostr.2017.07.161
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
F. Schaefer;E. Lang;Michael Bick;A. Knorr;M. Marx;C. Motz
中科院分区：
文献类型：
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作者：
F. Schaefer;E. Lang;Michael Bick;A. Knorr;M. Marx;C. Motz
在金属疲劳过程中，由于位错滑移传递受阻而在晶界处萌生裂纹是一种主要的失效机制。为了评估纹理化或无纹理微观结构的疲劳强度，需要量化晶界的电阻效应。基于相邻晶粒滑移系错位的几何方法被广泛使用。因此，我们验证了沈等人的几何传输因子。在粗晶粒高纯铝的假设下，一个大的滑移活动和一个阻止滑移在晶界的组合导致晶间裂纹萌生，并揭示了一个详细的知识的三维取向的晶界是必不可少的。因此，我们使用FIB横截面收集了有关3D微观结构的信息。因此，它是可能的，以评估潜在的裂纹萌生位点的一个特定的微观结构或估计的疲劳强度的纹理微观结构的裂纹萌生概率。
Crack initiation at grain boundaries due to blocked slip transfer of dislocations is a main failure mechanism during the fatigue of metals. A quantification of the resistance effect of a grain boundary is needed to assess a textured or texture-free microstructure for fatigue strength. Geometric approaches based on the misalignment of slip systems in adjacent grains are widely used. Hence, we validated the geometric transmission factor of Shen et al. in coarse-grained high-purity aluminum under the assumption that the combination of a large slip activity and a blocked slip at a grain boundary leads to intergranular crack initiation and revealed that a detailed knowledge of the 3D-orientation of the grain boundary is essential. Thereby we gathered information about the 3D-microstructure using FIB-cross-sectioning. Hence it is possible to evaluate potential crack initiation sites for a specific microstructure or to estimate the fatigue strength of a textured microstructure in terms of a crack initiation probability.