CELLULAR PRECIPITATION FROM PHASE BOUNDARIES IN CU-9 WT-PERCENT SB ALLOY

The first stages of cellular precipitation development and cell format ion at interphase boundaries have been investigated in a Cu-9 wt% Sb a lloy. From optical microscopy observations of the early stages of cell ular precipitation it seems that the Tu and Turnbull mechanism control s the reaction initiation. It is demonstrated that discontinuous preci pitation with the same morphology and interlamellar spacing can be ini tiated at interphase boundaries between the matrix and the eutectoid p hases, as well as at grain boundaries.