Abstract
This paper investigates the effects of carbon nanotubes (CNT) addition on the structure and mechanical properties of Ni3Al-xB (0.0 < x < 1.5 at%) intermetallic compound. Ni3Al-xB-1wt%CNT nanocomposite powders were first synthesized by mechanical alloying. Effects of CNT addition on the lattice strain and crystallite size of synthesized powders were investigated by means of X-ray diffraction (XRD) analysis. Scanning electron microscope (SEM) was used to study powder morphologies. Powders, synthesized by mechanical alloying, were then consolidated using spark plasma sintering (SPS), conducted at 950 °C under pressure 50 MPa. Microhardness and shear punch tests were employed to study the mechanical properties of sintered samples. Results show that CNT addition is accompanied by a decrease in crystallite size and a significant improvement of mechanical properties of Ni3Al-xB (0.0 < x < 1.5 at%) intermetallic compounds.
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