Synthesis of Porous Anodic Alumina on Aluminium Manganese Alloys

2015 ◽  
Vol 1109 ◽  
pp. 78-82
Author(s):  
Chun Hong Voon ◽  
Mohd Nazree Derman ◽  
U. Hashim ◽  
Kai Loong Foo ◽  
Seng Teik Ten
Keyword(s):  
Aluminium Alloy ◽  
High Purity ◽  
Manganese Content ◽  
Secondary Phase ◽  
Optical Microscope ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Aluminium Substrate ◽  
Purity Aluminium ◽  
High Purity Aluminium

In this study, porous anodic alumina was formed on aluminium alloy substrate with increasing manganese content, from high purity aluminium with 0 wt% Mn to aluminium alloy with 2.0 wt% manganese by anodizing. Substrates were anodized at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. Images from the optical microscope revealed that no secondary phase existed in high purity aluminium and aluminium substrate with 0.5 wt% manganese while two phases were observed when the manganese contents were higher than 0.5 wt%. Element dispersive X ray spectroscopy spot analysis suggested that the secondary phase consists of both aluminium and manganese. Well ordered porous anodic alumina was obtained on high purity aluminium and aluminium substrate with 0.5 wt% manganese while pore arrangement of porous anodic alumina was significant disturbed when aluminium alloys with manganese contents higher than 0.5 wt% were anodized.

Fast Fourier Transform Analysis of Images of Scanning Electron Microscope of Porous Anodic Alumina

2015 ◽  
Vol 1109 ◽  
pp. 69-72
Author(s):  
Chun Hong Voon ◽  
Mohd Nazree Derman ◽  
Kai Loong Foo ◽  
M. Nuzaihan ◽  
Uda Hashim
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
High Purity ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Oxide Dissolution ◽  
Purity Aluminium ◽  
High Purity Aluminium ◽  
Scanning Electron

In this study, Fast Fourier Transform (FFT) analysis was conducted on the images of scanning electron microscope of morphology of the porous anodic alumina formed on high purity aluminium. High purity aluminium substrates were anodized at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. As anodized porous anodic alumina were then subjected to oxide dissolution treatment of increasing exposure duration, up to three minutes. Micrographs were captured by using scanning electron microscope and the images were analyzed using FFT. It was found that the FFT images of as anodized porous anodic alumina and porous anodic alumina subjected to oxide dissolution treatment up to two minutes were similar, which were disc shaped white forms, indicating no ordered periodic structures were formed. When porous anodic alumina subjected to oxide dissolution treatment for three minutes, FFT image showed six distinct spots at the edges of a hexagon, indicating a perfect hexagonal pore arrangement was obtained for porous anodic alumina subjected to oxide dissolution treatment for three minutes.

Oxide Dissolution Treatment of Porous Anodic Alumina

2015 ◽  
Vol 1109 ◽  
pp. 73-77
Author(s):  
Chun Hong Voon ◽  
Mohd Nazree Derman ◽  
U. Hashim ◽  
Bee Ying Lim ◽  
Sung Ting Sam
Keyword(s):  
Periodic Structures ◽  
Cell Structure ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Hexagonal Cell ◽  
Oxide Dissolution ◽  
Purity Aluminium ◽  
High Purity Aluminium ◽  
Pore Arrangement ◽  
Ordered Porous

In this study, oxide dissolution treatment was used for the formation of well ordered porous anodic alumina. Porous anodic alumina was formed on mechanically polished high purity aluminium by anodizing at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. It is observed that the pore arrangement of as anodized porous anodic alumina was randomly distributed and showed no ordered hexagonal cell structure. As anodized porous anodic alumina were then subjected to oxide dissolution treatment of increasing exposure duration, up to three minutes. Micrographs were captured by using scanning electron microscope. Pore arrangement of porous anodic alumina subjected to oxide dissolution treatment up to two minutes were similar to one another where no ordered periodic structures were formed. .When porous anodic alumina subjected to oxide dissolution treatment for three minutes, a perfect hexagonal pore arrangement was obtained.

Shape rheocasting of high purity aluminium

2011 ◽  
Vol 64 (6) ◽  
pp. 479-482 ◽  
Author(s):  
U.A. Curle ◽  
H. Möller ◽  
J.D. Wilkins
Keyword(s):  
High Purity ◽  
Purity Aluminium ◽  
High Purity Aluminium

Recrystallization of high-purity aluminium during equal channel angular pressing

2007 ◽  
Vol 55 (7) ◽  
pp. 2211-2218 ◽  
Author(s):  
W. Skrotzki ◽  
N. Scheerbaum ◽  
C.-G. Oertel ◽  
H.-G. Brokmeier ◽  
S. Suwas ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
High Purity ◽  
Angular Pressing ◽  
Purity Aluminium ◽  
High Purity Aluminium

Further evidence for the presence of residual flaws in a thin oxide layer covering high purity aluminium

1993 ◽  
Vol 34 (12) ◽  
pp. 2099-2104 ◽  
Author(s):  
G.M. Brown ◽  
K. Shimizu ◽  
K. Kobayashi ◽  
G.E. Thompson ◽  
G.C. Wood
Keyword(s):  
Oxide Layer ◽  
High Purity ◽  
Thin Oxide Layer ◽  
Purity Aluminium ◽  
High Purity Aluminium ◽  
Thin Oxide

Structure Development during ECAP and Subsequent Creep of Aluminium

2007 ◽  
Vol 539-543 ◽  
pp. 493-498 ◽  
Author(s):  
Ivan Saxl ◽  
Vàclav Sklenička ◽  
L. Ilucová ◽  
Milan Svoboda ◽  
Petr Král
Keyword(s):  
High Purity ◽  
Grain Orientation ◽  
Orientation Imaging Microscopy ◽  
Structural Inhomogeneity ◽  
Structure Development ◽  
Creep Fracture ◽  
Orientation Imaging ◽  
Purity Aluminium ◽  
High Purity Aluminium ◽  
Creep Loading

Considerable structural inhomogeneity and anisotropy were found even after eight ECAP passes in high purity aluminium and the creep loading of ECAP material at 473K, 15MPa resulted in scattered fracture times ~ 20-60 hours. The structure revealed by orientation imaging microscopy with different disclination bounds was analysed by stereological methods. The effect of inhomogeneity and grain orientation on the creep fracture time was assessed.

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