Journal
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
Volume 20, Issue 3, Pages 1667-1680Publisher
WILEY
DOI: 10.1111/ijac.14286
Keywords
boron carbide; composite; hardness; NiTi; wear mechanism
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In this study, NiTi-x wt.%B4C (x= 0, 2, and 4) composites were prepared and the effects of boron carbide reinforcement addition on the microstructure and wear behavior were investigated. The results showed that the addition of boron carbide increased the hardness and wear resistance of the composite samples, and changed the wear mechanisms.
In this study, NiTi-x wt.%B4C (x= 0, 2, and 4) composites were consolidated with spark plasma sintering method, and the effects of boron carbide reinforcement addition on the microstructure and wear behavior of samples were investigated. Identification of the constituent phases of samples by the X-ray diffraction method plus Rietveld analysis revealed that the stability of the martensite phase increased in the composite samples because of mismatch stresses between the NiTi matrix phase and the reinforcing partides, which increases the density of the dislocations and facilitates the diffusion process that subsequently leads to the formation of stable intermetallics. The results of hardness test indicated that the hardness value increased from 3.67 GPa for pure NiTi to 10.99 GPa for NiTi-4wt.% B4C. Results of wear test revealed that boron carbide reinforced composite specimens had higher wear resistance, whereas wear rate of NiTi sample was 3.6 x 10(-3) mm(3)/N m, and it reached to .21 x 10(-3) mm(3)/N m for NiTi-4 wt.% B4C. Investigation of microstructure by scanning electron microscopy images and EDS analysis revealed that the wear mechanism in NiTi samples was abrasive and the addition of B4C to NiTi changed the wear mechanisms from abrasive to a combination of oxidation, adhesive, and delamination mechanisms.
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