We determined that the delamination was a classic cleavage fracture. The phosphorus segregation
bands in both grain boundaries and the interior of the grains increased the brittleness of the core of the
cross section where the tensile fracture occurred, facilitating the cleavage fracture. The increased texture intensity
on the {001} easy cleavage face also increased the likelihood of cleavage fracture at the half thickness of the
cross section of the specimen. During tension test, the maximum stress concentration in the thickness direction
occurred at the center of thickness. The delamination fracture propagated from and along that center area.
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