scholarly journals Influence of surface structure of (0001) sapphire substrate on the elimination of small-angle grain boundary in AlN epilayer

AIP Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 097143 ◽  
Author(s):  
Ryan G. Banal ◽  
Masataka Imura ◽  
Yasuo Koide
Keyword(s):  
Grain Boundary ◽  
Surface Structure ◽  
Sapphire Substrate ◽  
Small Angle

Small angle grain boundary Ge films on biaxial CaF2/glass substrate

2010 ◽  
Vol 312 (4) ◽  
pp. 607-610 ◽  
Author(s):  
C. Gaire ◽  
P.C. Clemmer ◽  
H.-F. Li ◽  
T.C. Parker ◽  
P. Snow ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Small Angle ◽  
Glass Substrate

Effect of Small-Angle Grain Boundary on the Mechanical Properties in Direct Silicon Bonded Wafer

2018 ◽  
Vol 215 (14) ◽  
pp. 1800118 ◽  
Author(s):  
Peng Wang ◽  
Can Cui ◽  
Xuegong Yu ◽  
Zhonglan Li ◽  
Deren Yang
Keyword(s):  
Mechanical Properties ◽  
Grain Boundary ◽  
Small Angle

Relaxation of Residual Stress in Bent GaN Film on Sapphire Substrate by Laser Treatment With an Optimized Surface Structure Design

2013 ◽  
Vol 60 (2) ◽  
pp. 767-770
Author(s):  
Chih Hua Chen ◽  
M.-H. Liao ◽  
Li Cheng Chang ◽  
Ssu Chieh Kao ◽  
M.-Y. Yu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Surface Structure ◽  
Laser Treatment ◽  
Sapphire Substrate ◽  
Structure Design ◽  
Gan Film

Effect of β Annealing and near β Zone Hot Deformation on the Microstructure and Texture of TC18 Alloy

2016 ◽  
Vol 849 ◽  
pp. 226-231
Author(s):  
Yi Min Cui ◽  
Wei Wei Zheng ◽  
Feng Zhang ◽  
Ai Xue Sha
Keyword(s):  
Grain Boundary ◽  
Dynamic Recrystallization ◽  
Small Angle ◽  
Hot Deformation ◽  
Static Recrystallization ◽  
Dynamic Recovery ◽  
Fiber Texture ◽  
Dual Phase ◽  
Phase Zone ◽  
Β Phase

Forged TC18 alloy billets with strong <100> texture were selected to investigate the effects of β annealing and near β zone hot deformation on the microstructure and texture by means of optical microscopy, XRD and EBSD techniques. The results showed that the original <100> fiber texture can’t be eliminated through β annealing although completed static recrystallization happened during annealing. After deforming in near β phase zone, the microstructures were composed of elongated β grains. A lot of small angle boundaries were observed near the original β grain boundaries, indicating that dynamic recovery controlled the deformation. Dynamic recrystallization grains can only be seen at the original β grain boundary at the strain of 50%. <100>//TD and <111>//TD texture were generated during the near β zone hot deformation. Annealing at dual phase zone after hot deformation can effectively reduce the proportion of grains with <111> orientation, but the <100>//TD texture still existed.

Microstructure characterization of one-directionally oriented ulexite

1998 ◽  
Vol 13 (3) ◽  
pp. 778-783 ◽  
Author(s):  
Yumi H. Ikuhara ◽  
Shinji Kondoh ◽  
Koichi Kikuta ◽  
Shin-ichi Hirano
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Small Angle ◽  
Stacking Faults ◽  
Contact Angles ◽  
Light Transmittance ◽  
High Angle ◽  
Electron Dose ◽  
Bundle Structure

Microstructures of ulexite were investigated by CTEM and low electron dose HREM. It was found that the longitudinal grains in ulexite were oriented to c-direction to form a bundle structure. There were a number of small-angle grain boundaries and stacking faults inside a grain in the ulexite. Cleavage microcracks and stacking faults were mostly introduced on the {010} of the ulexite. The high-angle grain boundaries mainly consisted of high coincidence boundaries, which was confirmed by a comparison of observed contact angles and calculated degree of coincidence at the boundaries. The light transmittance properties of the ulexite would depend on the defects such as stacking fault, small-angle grain boundary, and high-angle grain boundary.

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