Yazar "Topcu, Ismail" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Experimental investigation on mechanical properties of Multi Wall Carbon Nanotubes (MWCNT) reinforced aluminium metal matrix composites
    (KOREAN ASSOC CRYSTAL GROWTH, INC, 2020) Topcu, Ismail; Ceylan, Muhammet; Yilmaz, Elif Burcu
    The aim of this research is to obtain better micrographs and to perform the mechanical characterization of Multi Wall Carbon Nanotubes (MWCNT) consolidated aluminum matrix composite (AMC). This research is focused on the mechanical behavior and microstructure characteristics in MWCNT consolidated aluminum matrix composites. The composites of MWCNT/Al were successfully fabricated using powder metallurgy (PM) mechanical alloying (MA) sintering. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) micrographs were utilized in order to determine the porosity, density and hardness characteristics to observe if they are affected or not concerning the performance of composites in different reinforced % MWCNT rate conditions. Along with SEM and XRD studies, this study details the homogeneous distribution of nanotubes which showed no evidence of decomposition; this was supported by a successive increase in hardness and abrasion resistance. This increase in abrasion resistance and hardness can be accredited to the further activation of the slip system due to the presence of MWCNTs. Based on the conclusions of this study, the authors determined that the mechanical alloying sintering method provides promising results for the mechanical alloying fabrication of MWCNT/Al composites, especially due to the different % rate reinforced up capabilities.
  • Küçük Resim Yok
    Öğe
    Wear behavior of irregular shape Ti6Al4V powder reinforced with carbon nanotubes
    (KOREAN ASSOC CRYSTAL GROWTH, INC, 2020) Ceylan, Muhammet; Topcu, Ismail
    The purpose of this study was to investigate the sintering behavior, microstructural evolution, and the effect on wear resistance of carbon nanotubes (CNT) with the addition of a mechanical alloy (Ti6Al4V) and sintered irregular Ti64 powder. The mechanical alloy powders utilized in this study were produced through the process of CIP (Cold Isostatic Press) in order to produce samples by compress on under various pressures within a 300 MPa floating molded press. The samples were sintered at a high vacuum (10-5 mbar) for 60 minutes at a temperature of 1275 degrees C. After sintering, the materials were characterized using an optic microscope (OM), scanning electron microscopy (SEM) and EDX (Energy-dispersive X-ray spectroscopy) to determine whether the materials had wear resistance, density measurement, etc. The Carbon Nanotube wear and friction behavior were investigated under various conditions using a pin wear tester on a disc followed by a scanning electron microscopy (SEM) analysis. The objective of this study was to evaluate the density, metallographic properties and hardness of Ti64 samples supplemented with different CNT ratios as a function of sintering temperature. Theoretical density and micro-hardness of mechanical alloyed and sintered irregular Ti64 powders changed with the additions to CNT under increased sintering temperatures.