Research on Microstructure of Ni-20.3Cr-4.6Co-2.1Al As-deposited State Sheet Prepared by EB-PVD
The microstructure of Ni-20.3Cr-4.6Co-2.1Al sheet prepared by Electron Beam Physical Vapor Deposition(EB-PVD) in the as-deposited state was studied.The results showthat the phase in the as-deposited state is γ-Ni solid solution and there is no second-phase.As the effect of macro-stress,micro-stress and grain refinement during the preparation of the alloy results in interaction of diffraction peaks,subsequently the diffraction peaks are broadened and asymmetry The results analyzed by OM and SEM that the microstructure is dense and has refined grains,and intergranular corrosion resistance is different;TEM results shows that strain stripe exists in mcrostructure and substructure are mainly twins.AFM three-dimensional morphology shows that grains are slick without prism.It indicates that superalloy vapour changes from vapour phase→liquid phase→solid phase when it crystallize.