Mechanical properties and deformation behavior of amorphous nickel-phosphorous films measured by nanoindentation test

Abstract

In this study, amorphous Ni-P films were deposited by electroless plating under different pH values. Their mechanical properties and deformation behavior were then investigated by instrumented nanoindentation. With increasing pH value of the plating solution from 3.75 to 6.0, the hardness and elastic modulus of the obtained Ni-P films increased from 6.1 GPa and 146 GPa to 8.2 GPa and 168 GPa respectively. From the load-indentation depth curve, the Ni-P films were found to yield at an indentation depth of 8 nm. By microstructural examination around the indented regions, early-stage plastic deformation of the amorphous Ni-P films was verified through the formation and extension of shear bands with a spacing of several tens of nanometers. Within the shear bands, flow dilatationinduced intense shear localization was expected and resulted in crystallization in the amorphous matrix. The critical shear stress and energy release rate required for the initiation of early-stage plastic yielding of the Ni-P films were calculated to be about 1.4 GPa and 3.0 J/m(2) respectively, both of which increased with pH values

Anode properties of thick-film electrodes prepared by gas deposition of Ni-coated Si particles

“…We should note that the Ni3P coating markedly improves the elastic modulus, despite a much smaller amount of Ni3P coating (see Table 1). This suggests that the mechanical properties of the Ni layer on Si particles were strengthened by the P-doping in accordance with our expectation, which is supported by other results [6][7][8][9].…”

Ultralight Metallic Microlattices

“…Characterization of the base constituent by transmission electron microscopy (TEM) revealed that as-deposited electroless nickel thin films have an average grain size of ~7 nm, which is consistent with literature reports (14,15). Energy-dispersive x-ray spectroscopy confirmed that the film composition is 7% phosphorous and 93% nickel by weight.…”

“…Scott et al demonstrated photoinduced plasticity in cross-linked polymers (11). Similarly, reparability and self-healing can be induced either thermally (13) or photochemically (15,16) in radical systems. However, these systems undergo unavoidable termination reactions that limit reversibility of the networks.…”

Mechanical property and fracture behavior characterizations of 96.5 Sn–3.0 Ag–0.5 Cu solder joints

“…For the IMC layer, the elastic modulus and hardness were characterized as the highest as about 181 and 6.5 GPa, respectively. As for the Ni-P underlayer, its elastic modulus and hardness were obtained as about 143 and 3.8 GPa, respectively, rather close to the reported values of electroless Ni-P films [24]. Fig.…”