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Metallographic effects of pure aluminum on properties of nanoporous anodic alumina (NPAA)
Author(s) -
Rashidi Fereshteh,
Masuda Tatsuya,
Asoh Hidetaka,
Ono Sachiko
Publication year - 2013
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5285
Subject(s) - materials science , microstructure , annealing (glass) , recrystallization (geology) , aluminium , grain size , membrane , grain growth , sublimation (psychology) , metallurgy , composite material , chemical engineering , chemistry , psychology , paleontology , biochemistry , engineering , psychotherapist , biology
The microstructure of aluminum substrates was investigated during the quality control of grain sizes determination and crystal orientation analysis before and after preheat (recrystallization) treatment at 500 °C, in relation to the microstructure and heat stability of nanoporous anodic alumina (NPAA) membranes formed on various preheated aluminum substrates and subsequently detached. Depending on the preheating conditions, the average grain size of the aluminum substrate increased from 3 µm to 1280 µm. Also, the preferential crystal orientation of aluminum was (311) and/or (100) or (311)/(422) or (220) under different heating conditions. Recrystallization at a higher heating rate and particularly a higher cooling rate yielded lower grain growth of the aluminum substrate, so that quenching rather than annealing resulted in smaller grains and domains as well as a larger number of grain boundaries on the top surface of related α‐NPAA membranes. This induced less ordered growth in the nanopore structure and lower stability against cracking and deflection during crystallizing α‐NPAA thin film membranes. Copyright © 2013 John Wiley & Sons, Ltd.