The interlamellar atomic habit plane in Cu-6% Be pearlite

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Abstract
This investigation has sought to gain a better understanding of interphase boundaries in lamellar solid-solid phase transformations. Transmission electron microscopy has been used to characterize the f.c.c./ordered b.c.c. interface in the eutectoid Cu-6% Be binary. The atomic habit plane is established to be (111)f.c.c.//(110)b.c.c. with [110]f.c.c.//[111]b.c.c. Direction steps similar to those described by Hackney and Shiflet in ferrous pearlites were the only interfacial defect observed. Using point group intersection theory and our experimental results, it is shown that although the atomic habit plane is not a symmetry-dictated energy extremum, it is a minimum in energy space.