ATOMIC SCALE INVESTIGATION OF IMPURITY SEGREGATION TO CRYSTAL DEFECTS.

This paper presents a review of atomic-scale defects (planar defects and dislocations) analysis using atom probe (AP) and field ion microscopy (FIM). A large part of the discussion is dedicated to the first atomic-scale observation of a Cottrell atmosphere by a three-dimensional atom probe method (3DAP). The nanoscale boron segregation to line dislocations and planar defects in a B2-ordered FeAl (40 at.%A1) is imaged in three dimensions of the real space. The boron-enriched Cottrell atmosphere is imaged in the close vicinity of an edge {001} dislocation as a rod 3 nm in diameter, around to the dislocation line. [ABSTRACT FROM AUTHOR]