Preparation and mechanical properties of NiCoCrAlY/NiCr laminates by electron beam physical vapor deposition
(1.Center for Composite Materials, Harbin Institute of Technology, Harbin 150080, China2.Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China3.Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China)
Abstract: Laminates with alternating layers of NiCoCrAlY and NiCr were fabricated by using electron beam physical vapor deposition (EB-PVD) method. The influence of the substrate temperature on morphology of the laminates was investigated. The results show that in order to produce NiCoCrAlY/NiCr laminates with lower porosity, higher substrate temperature is required. The mechanical properties of the as-deposited samples and heat-treated samples were examined using tensile tests. The stress-strain curve of the as-deposited laminate shows a typical characteristic of multilayered materials and the fracture behavior is improved by annealing the samples at high temperatures. The tensile strength of the samples annealed at 760℃ is 658.4MPa, and the elongation reaches 6.2%.
Key words: NiCoCrAlY/NiCr laminate； electron beam physical vapor deposition (EB-PVD)； tensile test； substrate temperature