6 / 44
Volume 4
Nano Research & Applications
ISSN: 2471-9838
Notes:
JOINT EVENT
October 04-05, 2018 Moscow, Russia
&
2
nd
Edition of International Conference on
26
th
International Conference on
Advanced Nanotechnology
Materials Technology and Manufacturing Innovations
Advanced Nanotechnology 2018
& Materials-Manufacturing 2018
October 04-05, 2018
Page 26
Kolan Madhav Reddy
Shanghai Jiao Tong University, China
Kolan Madhav Reddy, Nano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C5-020
Nanoscale deformation characterization of light-weight ceramics
L
ightweight ceramics often composes of oxides, nitrides, carbides and borides have recently gained technological
importance or even still at the development stage with regard to future applications. Therefore experimental
observations of the atomic structure and their deformation mechanisms of lightweight ceramics are of extreme
importance in understanding and tailoring the materials properties. In this presentation, author will demonstrate the
atomic imaging of boron-rich solids (i.e., B
4
C and B
6
O) using newly developed annular bright field scanning transmission
electron microscopy (ABF-STEM) technique. The atomistic observations upon deformation provide the direct evidence
for the intragranular amorphous shear bands in both these brittle ceramics. To reduce the brittleness, nano-crystalline
B
4
C (n-B
4
C) microstructure with a homogenous distribution of nano-sized pores and amorphous carbon at grain
boundaries (GBs) was synthesized at relatively low temperatures. Transmission electron microscopy (TEM) of n-B
4
C
reveals that the unusual nanosize effect arises from the deformation reduced elimination of nano-porosity mediated
by grain boundary sliding with the assistance of the soft boundary phases. Finally, our recent observations combined
with computer simulations reveals GB sliding leads to the amorphous band formation at pre-distorted icosahedral GB
regions with initiation of cavitation within the amorphous bands. These theoretical and experimental results provide an
atomistic explanation for the influence of GBs on the deformation behavior of nano-crystalline ceramics. .
Biography
Kolan Madhav Reddy has completed his PhD in Materials Science and Engineering at Tohoku University, Japan and Postdoctoral research at Johns Hopkins
University, USA. He is currently an Associate Professor in School of Materials and Engineering at Shanghai Jiao Tong University, China. He has authored
and co-authored more than 25 peer-reviewed papers and filed a patent.
kmreddy@sjtu.edu.cn