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  • Küçük Resim
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    The comparison of wear performances of CP-Ti, Ti6Al4V, Ti45Nb alloys oxidized by anodic oxidation under ambient air and vacuum conditions
    (Elsevier, 2023) Asl, Hojjat Ghahramanzadeh; Sert, Yasar; Kucukomeroglu, Tevfik; Bayrak, Ozgu
    Commercially pure (CP-Ti) and alloyed titanium such as, Ti6Al4V and Ti45Nb have versatile use from aerospace to biomedical applications due to the low density, high specific strength, and corrosion resistance features. In addition to the impressive properties of Ti alloys, the sensitivity of wear is a cause for concern. Various surface treatments are employed to overcome this problem, and one of the most important one is the oxidation treat-ment. This was study mainly aimed to investigate the effects of anodic oxidation process on the structural, hardness and wear features of the CP-Ti, Ti6Al4V and Ti45Nb materials. The wear behavior of specimens was determined at 2 different constant loads (1 N and 2 N) under ambient air and vacuum environments. It was noted that the hardness of these materials improved with the oxidation, but this increase was striking in Ti45Nb (94%). Besides, it was observed that oxidized specimens show higher wear performance than untreated ones in both wear conditions. It has been revealed that the wear in the vacuum condition is more stable than in the ambient air. Meanwhile, the rutile phases were exhibited to be more resistant to frictional and mechanical effects during wear tests.
  • Küçük Resim
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    Investigation of the friction and wear properties of nitrided 7075-T6 aluminum alloy under vacuum and ambient air
    (Pamukkale Univ, 2022) Ghahramanzadeh Asl, Hojjat; Sert, Yasar; Bayrak, Özgü; Kucukomeroglu, Tevfik
    Al7075 alloy is commonly used in the automotive industry, components of military vehicles and aircraft, rubber and plastic moulds. Also, similar Al alloys are frequently used for mechanical parts in space exploration. Therefore, investigation of the wear properties under a vacuum environment is as indispensable as wear properties under an atmosphere. However, the wear performance of this alloy cannot meet the expectations. This paper reports the investigation of the obtained wear properties of Al7075-T6 alloy after plasma nitriding in ambient air and vacuum environments. The surface characterization and phase analysis of the formed AlN layers are determined by scanning electron microscope, energy dispersive X-ray spectrometer, 3D optical profilometer and X-ray diffractometer. The hardness of the nitride layer is established using Vickers micro-hardness tester. The wear performance of the untreated and nitride sample is investigated under 1N constant load at ambient air and vacuum environment. As a result of wear tests, the best wear performance of both conditions has been obtained from nitrided samples. The AlN layer (0.19) is observed to notably reduced the coefficient of friction of the substrate (0.60) under ambient air. Besides, it is observed that the nitride layer is better in ambient air (0.00010 mm(3)/Nm) than in vacuum environment (0.00087 mm(3)/Nm) in term of wear rate. In fact, the wear track on the nitrided sample is very thin under ambient air, and nearly imperceptible.