Authors: M. Sherif El-Eskandarany, A. Al-Hazza, E. Shaban, A. Alduweesh, A. Al-Rowayeh
Affilation: Kuwait Institute for Scientific Research, Kuwait
Pages: 211 - 214
Keywords: refractory materials nanopowders, ball milling, mechanical properties
In contrast to the industrial approach for preparing such important materials, we have succeeded to synthesize a single phase of Ti50C50 nanopowders, using high-energy ball milling technique. The ball milling procedure took place at ambient temperature in an argon gas atmosphere. The end-product that obtained after 200h of ball milling was consolidated into full dense nanocrystalline compacts, using spark plasma sintering (SPS) technique. The synthesized nanopowders and their consolidated bulk materials were characterized by X-ray diffraction (XRD), high resolution transmission electron microscope/energy dispersive X-Ray spectrometer (HRTEM/EDS), field emission scanning electron microscope (FESEM) and electron probe micro analyzer electron microscope/EDS (EPMA/EDS). The micro-and nano-hardness together with microfracture- and nanofracture toughness of the consolidated samples were investigated by Vickers hardness (VH) tester and nanoindenter (400mN), respectively. Nanoindention approach was employed to investigate the Young's modulus, stiffness modulus, nanoscratch, viscoelastic creep behaviors and stress-strain curve. Moreover, The Young's modulus properties were determined via approach. In addition, the shear modulus, bulk modulus and elastic modulus were investigated by pulse-echo overlap ultrasonic technique. On the basis of the results of the present study, the ball-milling technique accompanied with SPS can provide powerful tools for the fabrication of nanocrystalline TiC bulk materials with advanced properties.