Ni/Ni_3Al microlaminate composite produced by EB-PVD and the mechanical properties

摘要

Microlaminates with alternating layers of Ni and Ni_3Al were fabricated by using EB-PVD method. The influences of deposition rates and substrate temperature on morphology of the microlaminates were investigated. The results showed that in order to produce Ni/Ni_3Al mierolaminate with lower porosity and prevent the formation of columnar grains, higher deposition rates and substrate temperature were required. The mechanical properties of the microlaminates were examined using tensile tests. The fracture behavior was temperature and interlamellar spacing dependent, with a lower tensile strength at higher temperature or with larger interlamellar spacing.