Abstract
In the current study, it is demonstrated that soft grains along 〈100〉 fiber provided a pure shear condition for easy dislocation movement leading to a relatively low dislocation density. The hard grains along the 〈111〉 fiber, however, were not favorably oriented for slip system activation and caused high dislocation accumulation. It is concluded that the average overall dislocation density does not provide a meaningful value, as it is largely dependent on the original material crystallographic texture, the numbers of hard and soft grains in the electron backscatter diffraction (EBSD) mapped area, and the grain size factor.
Highlights
In the current study, it is demonstrated that soft grains along h100i fiber provided a pure shear condition for easy dislocation movement leading to a relatively low dislocation density
It is established that the electron backscatter diffraction (EBSD) technique can calculate geometrically necessary dislocation (GND) type but cannot recognize statistically stored dislocation (SSD) type.[10,11]
The validity of these postulations is only assessed via GND measurement, neglecting SSD contributions on work hardening and strain accumulation at the stress magnitudes used throughout the current study
Summary
It is demonstrated that soft grains along h100i fiber provided a pure shear condition for easy dislocation movement leading to a relatively low dislocation density. Values of the samples might give inaccurate quantitative data comparison between different crept samples, as they largely depend on the original material texture and the number of hard and soft grains mapped during EBSD scans.
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