Publication date: Available online 5 December 2016
Source:Thin Solid Films
Author(s): Łukasz Maj, Jerzy Morgiel
The Ni(V)/Al multilayers, known as NanoFoil® (bilayer thickness of λ3 Ni and Al3 Ni2 phases nucleate at Ni(V)/Al and Ni(V)/Al3 Ni interfaces, respectively, the final NiAl nucleates throughout the intermixed Al3 Ni and Al3 Ni2 (original Al) layer. The growth of the Al3 Ni crystallites proceeds by a moving planar front along the Al layer changing the Ni(V)/Al into Ni(V)/Al3 Ni multilayers. The growth of Al3 Ni2 crystallites resembles the standard coarsening of rounded precipitates. The growth of final NiAl phase is much faster than Al3 Ni2 and results in formation of a string of cubical crystallites separated by a discontinuous layer of fine Al8 V5 crystallites. The described series of phase transformations might be considered as a model for solid state diffusion controlled reaction of Ni/Al multilayers.
Source:Thin Solid Films
Author(s): Łukasz Maj, Jerzy Morgiel