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The effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron–silicon alloy was investigated by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. In contrast to the previously reported results in an inert environment, no dislocation cells were formed around the crack tip in a hydrogen environment. The microscopic...
Dislocation structures around a mixed-mode fatigue crack tip introduced into a single-crystalline iron–silicon alloy is characterized by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. The results show that the crack growth is preceded by the formation of a cell band and the crack grows along cell boundaries. Crack growth rate and width of the cell band are constant...
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