posted on 2020-09-21, 15:34authored byGurjinder Kaur, Vijayesh Kumar, Nitish Bibhanshu, K. S. Suresh, Indranil Lahiri
The present investigation is aimed to find
a thread between various surface textures
of polycrystalline Cu–Ni alloys, in cold-rolled and annealed conditions, and the nature of graphene,
grown by the chemical vapor deposition (CVD) method, on these substrates.
High-quality graphene grown on Cu–Ni alloys was transferred
to various nanostructures, such as CuO nanorods and carbon nanotubes,
for field emission application. In this work, Cu–Ni (100Cu–0Ni,
84.65Cu–15.35Ni, 72.6Cu–27.4Ni, and 63Cu–37Ni)
alloy buttons were prepared by arc melting, and texture in the samples
were engineered by cold rolling (plastic deformation) and annealing
(recrystallization) processes. Study of surface texture by X-ray method
demonstrates characteristically different deformation and recrystallization
texture components, compared to conventional rolling and annealing
textures. The evolution of texture has been explained based on the
effects of surface friction, shear stress, and addition of Ni. Unusual
appearance of {111} orientations, though less in volume, after annealing
at 1000 °C, was observed in Cu–Ni alloys through the suppression
of cube texture component. The underlying deformation and recrystallization
mechanisms are explained through the changes in strain hardening,
extended recovery, and continuous recrystallization effects. The effects
of Ni content are correlated with the number of graphene layers, while
an increase in the fraction of {111} orientations could be linked
with defect density in graphene layers. Results of the present study
will be motivating for selection of various polycrystalline Cu–Ni
alloys, with different surface textures, for controlling quality of
graphene, synthesized by the chemical vapor deposition method.