Application of Transmitted Kikuchi Diffraction in Studying Nano-oxide and Ultrafine Metallic Grains.
Transmitted Kikuchi diffraction (TKD) is an emerging SEM-based technique that enables investigation of highly refined grain structures. It offers higher spatial resolution by utilizing conventional electron backscattered diffraction equipment on electron-transparent samples. A successful attempt has been made to reveal nano-oxide grain structures as well as ultrafine severely deformed metallic grains. The effect of electron beam current was studied. Higher beam currents enhance pattern contrast and intensity. Lower detector exposure times could be employed to accelerate the acquisition time and minimize drift and carbon contamination. However, higher beam currents increase the electron interaction volume and compromise the spatial resolution. Lastly, TKD results were compared to orientation mapping results in TEM (ASTAR). Results indicate that a combination of TKD and EDS is a capable tool to characterize nano-oxide grains such as Al2O3 and Cr2O3 with similar crystal structures.
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology , Seoul 02792, Republic of Korea.
Majid
M
Abbasi
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology , Seoul 02792, Republic of Korea.
Dong-Ik
DI
Kim
Korea Basic Science Institute , Daejeon 34133, Republic of Korea.
Hwan-Uk
HU
Guim
Department of Materials Science and Engineering, Shiraz University , Shiraz, Iran.
Morteza
M
Hosseini
Department of Materials Science and Engineering, Shiraz University , Shiraz, Iran.
Habib
H
Danesh-Manesh
Department of Mining and Metallurgy, Amirkabir University of Technology , Tehran, Iran.
Mehrdad
M
Abbasi
accumulative roll bonding; nanograins; orientation imaging in TEM; oxidation; transmitted EBSD; transmitted Kikuchi diffraction; ultrafine grains