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The influence of Mo/B atomic ratio on microstructural evolution and mechanical properties of Mo2FeB2-based cermets

  • Jiajie Zhang , Yong Zheng , Wei Zhou , Guotao Zhang , Zheng Ke , Zuowei Dong and Xuepeng Lv
Published/Copyright: July 8, 2019
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 110 Issue 7

Abstract

Mo2FeB2-based cermets were prepared with various Mo/B atomic ratios in the range of 0.8 to 1.1. The microstructure and crystalline phases were studied through scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray analysis and X-ray diffractometry. The results indicated that as the Mo/B atomic ratio increased, the morphology of the hard phase gradually transformed from long-strip to near-equiaxed. The tendency of transformation in the range of 1.0 to 1.1 was more significant. Two typical cermet samples (Mo/B = 1.0, Mo/B = 1.08) of different morphologies were studied with transmission electron microscopy. As the Mo/B atomic ratio increased, the average particle size decreased, inhibiting the nucleation of the particles, the anisotropy of different crystallographic planes reduced, the particles transformed from long-strip to the near-equiaxed shape. Moreover, it could be found from X-ray diffractometry results that the disparity between the crystal lattice constants c and a gradually diminished and the surface tension differences of the amorphous surfaces decreased, resulting in the anisotropy of different crystal-lographic planes gradually decreasing. The cermets with Mo/B = 1.02 demonstrated the highest transverse rupture strength, as well as the hardness and improved fracture toughness values of 2367.5 ± 50 MPa, 88.2 ± 0.1 HRA, and 27.6 ± 0.5 MPa · m1/2, respectively.

Keywords: Mo2FeB2-based cermets; Mo/B atomic ratio; Particle morphology; Transmission electron microscopy
∗Correspondence address, Prof. Yong Zheng, College of Material Science & Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P.R. China, Tel.: +86-25-52112626, Fax: +86-25-52112626, E-mail:

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Received: 2018-11-20
Accepted: 2019-01-24
Published Online: 2019-07-08
Published in Print: 2019-07-15

© 2019, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111778
Keywords for this article
Mo2FeB2-based cermets; Mo/B atomic ratio; Particle morphology; Transmission electron microscopy

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. 3D morphology characterization of graphite and its effect on the thermal conductivity of vermicular graphite iron
  5. Experimental liquidus studies of the Zn–Fe–Si–O system in air
  6. Phase transitions in copper–silver alloys under high pressure torsion
  7. High-temperature oxidation behavior of low sulfur martensitic stainless steel 1Cr13Mo containing cerium
  8. Microstructure and properties of Cu-bearing carbidic austempered ductile iron
  9. Fabrication of Al–WC gradient nano-composite via centrifugal casting method
  10. Properties of vacuum-laser-welded Ti-based bulk metallic glass and Zr-based bulk metallic glass composite
  11. Optimal design and characterization of novel biomedical Zr-based alloys for hard tissue substitution
  12. The influence of Mo/B atomic ratio on microstructural evolution and mechanical properties of Mo2FeB2-based cermets
  13. Piezo-spectroscopic and tribological characterization of diffusion bonded oxide laminate composite ceramics
  14. Short Communications
  15. ZnO-modified SnO flower-like microstructures with enhanced photocatalytic performance
  16. DGM News
  17. DGM News
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