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Structural phase transitions in (3-D) metals usually involve simple (Burgers) transformations among the well known structures, fcc, bcc, hcp and metastably, the omega phase. Accompanying these crystallographic changes are various macroscopic shears and microscopic shuffles depending upon what kinds of symmetry changes are ultimately involved. Most of the transitions are first order, however, and it has been of continuing interest to explore the extent to which a lattice dynamical basis can be given to such phase changes. Neutron scattering, coupled with X-ray studies, is in principle an ideal tool for looking at this problem and limited evidence exists for mode softening and/or pretransitional fluctuations in some of these systems. The majority of systems do not, however, exhibit dramatic soft mode behavior, as is seen, for example, in Nb3Sn, and in many cases the lattice dynamical response appears normal. The influence of defects on the neutron scattering is also briefly alluded to

NEUTRON STUDIES OF PRETRANSITIONAL FLUCTUATIONS ABOVE STRUCTURAL TRANSITIONS IN METALS