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as shear bands, kink bands result in large
but limited local deformation, do not
cause microstructural damage, and may
even provide a beneficial mechanical re-
sponse. Kink band formation allows for
very large deformations at a constant
stress, with neither a load drop nor an
increase in engineering stress that would
occur during homogenous deforma-
tion
[7]
. Therefore, kink bands may prove
beneficial for the design of energy ab-
sorbing structures where large strain de-
formation at a constant reaction force is
a highly desirable mechanical response.
Summary
Cu-Nb nanolaminates can be pro-
duced in bulk form using the industry
scalable ARB process. These materials
display high strengths (>1 GPa) and show
a strong propensity for kink band forma-
tion during layer parallel compression.
The combination of microstructural
stability, high strength, and unusual de-
formation behavior make metallic nano-
laminates intriguing candidate materials
for structural applications.
~AM&P
For more information:
Thomas Nizolek
is a Ph.D. student at University of Califor-
nia, Santa Barbara,
tnizolek@engr.ucsb.
edu, www.materials.ucsb.edu.
This article has been adapted from a full
length feature in
Metallography, Microstruc-
ture, and Analysis
3.6 (2014): 470-476,
DOI 10.1007/s13632-014-0172-2. © Spring-
er Science+Business Media New York and
ASM International 2014.
Acknowledgment
T.N. was supported by the Department of
Defense through the National Defense Sci-
ence & Engineering Graduate Fellowship
(NDSEG) Program. J.T.A., T.N., I.J.B, and
T.M.P. wish to acknowledge support by the
UC Lab Fees Research Program,
Award #238091.
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