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Abstract. Ti-Si-N nanocomposite films were prepared by co-sputtering Ti and Si targets in Ar/N 2 gas atmosphere. The effect of N 2 flow rate on the structure, adhesion strength and friction coefficient of the deposited films was studied by using X-ray diffraction, atom force microscope, field emission scanning electron microscopy and multi-functional tester for material surface properties. The Ti-Si-N films had a fine, smooth and compact structure with TiN nanograins embedded in an amorphous Si 3 N 4 matrix. The nanocomposite films exhibited (200), (111), (220) and (222) reflections with a dominant orientation of the (200) reflection. When the N 2 flow rate increased, the film structure was refined. It was found that both interfacial adhesion strength and friction coefficient depended on the N 2 flow rate, and the best values were exhibited by the nanocomposite film produced at N 2 flow rate of 15 sccm, perhaps contributed to a finer and smoother structure of this deposited film.

Abstract. The effect of quenching condition such as air cooled (AC) and water quenched (WQ) treatment on the corrosion behavior of 6063 Al alloy was investigated by optical microscope, field emission scanning electron microscope and electrochemical work station. The experimental results showed that the corrosion resistance of the AC 6063 Al alloy was much worse than that of the WQ one, and the corrosion form of the AC sample was intergranular corrosion (IGC) and pitting whereas only pitting was found on the WQ alloy. Slow quenching after solution heat treatment caused grain boundary precipitation Mg 2 Si, introducing IGC susceptibility. The corrosion mechanism of pitting was contributed to galvanic corrosion between coarse impurity phase particles (Al-Fe-Si) and matrix Al, and IGC resulted from galvanic corrosion between grain boundary precipitates and matrix Al.