Abstract
The technique of atom probe field ion microscopy has been used to estimate the position of the low temperature miscibility gap in the iron-rich portion of the iron-beryllium system by direct measurement of the compositions of the phases. The morphology of the two phases produced by spinodal decomposition within this miscibility gap was determined to be a dislocated macrolattice of isolated cuboidal particles of the iron-rich 03B1 phase embedded in a matrix of the B2-ordered berylliumenriched FeBe phase. Atom probe measurements indicated that there was a significant variation in the compositions of the coexisting phases and the differences in the beryllium contents between the phases increased with aging time at 350 and 400 ° C.
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