Fabrication of NiAl matrix hybrid ultrafine composite from the Ni-Al-Ti-B4C system via combustion synthesis |
Paper ID : 1513-UFGNSM-FULL |
Authors: |
hadi ghazanfari AmirKabir University of Technology |
Abstract: |
In this article preparation of NiAl matrix hybrid ultrafine composite with up to 40%wt TiC-TiB2 as reinforcement was achieved by thermal explosion mode of combustion synthesis from the Ni-Al-Ti-B4C system. B4C powder was used as a source of both B and C, which is much greatly reduced the fabrication costs. Scanning electron microscopy (SEM) and wavelength dispersive spectroscopy (WDS) were used to characterize the microstructure of the synthesized composites and elemental map distribution respectively. X-ray diffraction was used to investigate the phases of the final products. It was revealed that products contained NiAl, TiB2, and TiC compounds with the small amount of B13C2 and Ti. It was illustrated that existence of B13C2 may have been due to the coarse size of B4C in starting material which restricted diffusion of B and C. The adiabatic temperature, particle size of reinforcements, and amount of remained B13C2 increased with increasing in the amount of reinforcement. Particles size of reinforcement was in the ultrafine range for lower amount of reinforcement. However, Increasing the amount of reinforcement leads to increasing the particle size to micron range. |
Keywords: |
combustion synthesis, SHS, NiAl, TiB2, hybrid composite |
Status : Paper Accepted (Poster Presentation) |