“…For these elements, planarity is believed to occur not as a result of a SFE change, but rather as a result of dislocation cutting of clusters, enforcing planar arrays (Thompson and Bernstein, 1975;Swann, 1963;Kowaka and Fujikawa, 1972). The deleterious effect of Ν is found to be enhanced by low-temperature aging (Eckel and Clevinger, 1970), supporting the importance of clustering. A further ex ample of this behavior is presented in Fig.…”