The lattice misfit determination in fragmented single crystals of nickel-based superalloy

The problem of lattice constant and lattice misfit determination in Nickel-based single crystal superalloy is very actual. The X-ray diffraction results indicate that the Nickel-based single crystal superalloy was not a perfect monocrystalline material, which is comprised of many subgrains; and each subgrain also consists of a large numbers of mosaic structures. It is well known, it is difficult to precisely measure the lattice misfit for nickel-based single crystal superalloys. The corresponding reasons are low values of misfit, segregation of refractory element, mosaic structure in crystals and distorted lattice cells caused by coherent stress at phase interfaces. The purpose of this work is to develop a simple and reliable method for the determination of the fragments in the single crystals of Nickel-based superalloy by using an X-ray diffractometer.