Tensile properties and fracture behavior of nanocrystalline Ni3Al intermetallic foil

Fully dense nanocrystalline Ni3Al intermetallic foil was successfully produced from as-cast coarse-grained sheet by heavy rolling at liquid nitrogen temperature and subsequent recrystallization. The mechanical properties and fracture behavior of the nanocrystalline foil with grain size about 20 nm were derived from uniaxial tension tests at room temperature. Typically, the nanocrystalline foil exhibits significantly higher yield strength (∼2.6 GPa), and reduced tensile elongation (∼4.0%) relative to its microcrystalline counterpart (yield strength ∼0.7 GPa and tensile elongation ∼22%).