The rafting of monocrystalline Ni- and Co-based superalloys has been studied by neutron diffractometry. The nature of rafting is shown experimentally to be dependent upon both the lattice parameter misfit and the difference in phase stiffnesses. The 900 ◦C yield strength of the γ phase of the Co-based superalloy with rafted microstructure occurs at ≈100 MPa. The data presented should assist in refining computer models that aim to predict precipitate evolution in superalloys and aid future alloy design.
Citation: Scripta Materialia
Pub Type: Journals
neutron diffraction, superalloy, rafting, yield phenomena, elastic behaviour