High-temperature Compressive Performance of Mg Alloy Foams Coated with Ni-P Layer

Abstract

Mg/Ni hybrid foams were fabricated by the electroless method. The Ni-P (Nickel-Phosphorous) coatings were deposited on the surface of closed-cell Mg alloy foams. The composition, microstructure and phases of the Ni-P coatings were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD), respectively. The compressive tests were performed on the Mg/Ni hybrid foams at 400 °C using the Mg alloy foams as a reference. The experimental results show that the yield strength, plateau stress and energy absorption capacity of the closed-cell Mg alloy foams at high temperature were improved by the Ni-P coating. And there are four main modes for the Mg/Ni hybrid foam failure at 400 °C, i e, shearing in cell wall, bending in cell edge, shedding and cracking in Ni-P coating.