High-temperature tensile properties of amorphous Fe78Si9B13/nano-Ni laminated composite

The high-temperature tensile properties of amorphous Fe78Si9B13/nano-Ni laminated composite were studied by experiment and finite element method (FEM). The laminated composite prepared by pulse electrodeposition method exhibits good ductility below the crystallization temperature (Tx) of amorphous layer. A maximum elongation of 115.5% was obtained when the volume fraction of nano-Ni layers (VNi) was 0.77, which is greatly higher than that of monolithic amorphous Fe78Si9B13 ribbon (36.3%) tested under the same conditions. Due to a stress and strain gradient existing in Ni layers, amorphous layer is constrained by good interfacial bonding to deform in conformity with nano-Ni layers and can be significantly stretched without fracture. Monolithic nano-Ni layers behave tensile superplasticity and the ductility of laminated composite increases with VNi. Amorphous layer controls the tensile behavior of the laminated composite. Due to tensile stress and temperature driven, its crystallization causes the elongation decreasing at relatively high temperature.