Browsing by Author "Tsunekawa, Y."

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The Effect of Cold-Worked Ratio on Corrosion Behavior of T8 Tempered Al-si-mg/Sicp Metal Matrix Composites
(International Committee on Composite Materials, 2007) Dikici, B.; Tekmen, C.; Gavgali, M.; Tsunekawa, Y.
The corrosion behaviors of T8 tempered Al-Si-Mg/SiCp metal matrix composites (MMCs) were investigated in aerated and deaerated 3.5wt% NaCl solutions by potentiodynamic polarization technique in this study. In order to determine the effect of cold work on the electrochemical behavior, the composites were cold-worked to a plastic strain of 4, 6, 10, 25 and 50%. A major change in the corrosion morphologies were observed cold working ratio increased from 4 to 50%. For example, electrochemical analysis indicated that the corrosion current densities (icor) of 20% vol. SiC composite increased from 0.8 to 5.9 with increasing cold-worked ratio after T8 temper. In addition, we find that there is a significant coloration between corrosion susceptibility and level of cold work.
Wear Behavior of Plasma Sprayed Composite Coatings With in Situ Formed Al2o3
(Elsevier Sci Ltd, 2009) Mindivan, H.; Tekmen, C.; Dikici, B.; Tsunekawa, Y.; Gavgali, M.
In the present study, the wear behavior of in situ formed Al2O3 reinforced hypereutectic Al-18Si matrix composite coatings have been investigated. These coatings were successfully fabricated with mechanically alloyed Al-12Si and SiO2 powder deposited on aluminum substrates by atmospheric plasma spraying (APS). The produced samples were characterized by means of microscopic examinations, hardness measurements and wear tests. The obtained results pointed out that the amount of in situ formed Al2O3 particles increased with increasing spray distance and decreasing in-flight particle velocity and temperature, which was accompanied by an improvement in hardness and wear resistance. (C) 2009 Elsevier Ltd. All rights reserved.