XRD and TEM in situ Heating of Large Period Ni/Al Multilayer Coatings
Z. Świątek a, A. Gradys b, Ł. Maj a, J. Morgiel a, K.W. Marszałek c, R. Mania c, and M. Szlezynger a
aInstitute of Metallurgy and Materials Science, PAS, W. Reymonta 25, 30-059 Cracow, Poland
bInstitute of Fundamental Technological Research, PAS, Warsaw, Poland
cAGH University of Science and Technology, Cracow, Poland
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The Ni/Al multilayer coating of λ ≈100 nm was deposited onto (001)-oriented monocrystalline silicon substrate using double target magnetron sputtering system equipped with rotating sample holder. The thicknesses of alternating layers were adjusted in the way to preserve the chemical composition ratio close to 50%Al:50%Ni (at.%). The in situ X-ray diffraction and in situ transmission electron microscopy heating experiments were carried out at relatively low heating rates (20°C/min) in order to study the phase transformation sequence. The investigations revealed that the reaction between Ni and Al multilayers starts at ≈200°C with precipitation of Al3Ni phase, while above 300°C dominates precipitation of Ni3Al and NiAl intermetallic phases. Both the X-ray and electron diffractions acquired at 450°C confirmed presence of the Ni3Al and NiAl intermetallics, but the former pointed at still lasting traces of Ni(Al) solid solution.

DOI: 10.12693/APhysPolA.130.880
PACS numbers: 68.65.Ac, 68.37.Lp