A FIELD-ION MICROSCOPY STUDY OF A TUNGSTEN-3 AT PERCENT RHENIUM ALLOY - STREAK CONTRAST EFFECTS

Field-ion microscope observations of a tungsten-3 at.% rhenium alloy were made to determine whether a definite correlation between image streaking and some metallurgical condition of this alloy could be established. Streak contrast effects were observed but no such correlation was found. It is suggested here that the primary cause of streaking is associated with tip asymmetry produced during specimen preparation rather than with intrinsic features such as stacking faults. The possible role of alloying element and impurity segregation is cited. © 1968.