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Fahamsyah H. Latief,Koji Kakehi,Yuma Tashiro 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Oxidation behavior of an aluminized Ni-based single crystal superalloy CM186LC was performed between 900 8C and 1100 8C in air. The oxidation kinetics approximately followed a parabolic oxidation law at 900 8C and 1100 8C. The mass gains were significantly increased owing to the formation of u-Al2O3during initial oxidation stage. After 100 h oxidation, the mass gain rates were then decreased due to the transformation from u-Al2O3 to a-Al2O3. The microstructures after 500 h oxidation at all temperatures generally consisted of scale, coating layer, interdiffusion zone (IDZ), substrate diffusion zone (SDZ)accompanied with the topologically close-packed (TCP) and substrate.
El‑Sayed M. Sherif,Fahamsyah H. Latief,Hany S. Abdo,Nabeel H. Alharthi 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.6
In this study, manufacturing of Ti–5Al and Ti–5Al–5Cu alloys were accomplished employing mechanical alloying technique. The corrosion resistance in 3.5 wt% NaCl solution of Ti–5Al and Ti–5Al–5Cu alloys was investigated using cyclicpolarization (CPP), electrochemical impedance spectroscopy (EIS) and chronoamperometric current–time measurements. The corroded surfaces of Ti–5Al and Ti–5Al–5Cu were examined by the use of a scanning electron microscopy and energydispersive X-ray spectroscopy. It is found that Ti–5Al suffers both uniform and pitting corrosion, particularly with prolongingthe time of exposure period in the chloride solution. While, the addition of Cu, Ti–5Al–5Cu alloy, increases the intensity ofuniform corrosion and decreases the probability of pitting attack. Prolonging the immersion time to 48 h before measurementdecreases the corrosion of Ti–5Al alloy, while increases the corrosion of Ti–5Al–5Cu.