Fig. 8A–C.

Light micrographs showing typical examples of wrought alloy microstructure in (A) a longitudinal-oriented surface of a sample with banding, (B) a transverse-oriented surface of the same sample, and (C) a longitudinal-oriented surface of a sample, which did not show banding. (A) A banded structure running from the proximal to distal direction of the head is clearly exhibited. (B) In the transverse orientation, dendritic structures remain that were not removed during thermomechanical processing of the wrought alloy. Here, the residual dendritic structures are characterized by dark lines forming a distorted lattice structure (arrows). (C) No banding occurred in this alloy.