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Investigation of the microstructure and mechanical properties of NbB2 particle reinforced aluminum matrix composites

  • Zhi Li , Wanling Pan , Wei Wang , Ting Yang , Fucheng Yin and Lvlin Yi
Published/Copyright: February 25, 2019
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 110 Issue 3

Abstract

A mixture of Nb powder and boron salt (KBF4) was added to aluminum alloy melt to prepare particle reinforced aluminum matrix composites at 850°C. Microstructure, fracture morphology, and the chemical composition of the composite were characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. The average size of NbB2 in the studied composites is found to be about 0.3 μm under optimal process parameters. The size of primary silicon particles is refined from 60–100 μm to 30–50 μm. Tensile testing results reveal that the reinforced composite exhibits higher microhardness, tensile strength, yield strength and poorer ductility than those of the matrix alloy. The fracture mode is found to be brittle fracture, which is mainly dominated by silicon particle cracking and NbB2 particle–matrix debonding.

Keywords: NbB2; Refinement; Microstructure; Mechanical properties; Aluminum matrix composites
∗Correspondence address, Professor FuCheng Yin, School of Materials Science and Engineering, Xiangtan University, Hunan 411105, P.R. China, Tel.: +86 0731 58298428, E-mail address:

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Received: 2018-05-27
Accepted: 2018-09-19
Published Online: 2019-02-25
Published in Print: 2019-03-13

© 2019, Carl Hanser Verlag, München

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  5. Kinetics of intermetallic compound layers during initial period of reaction between mild steel and molten aluminum
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https://doi.org/10.3139/146.111745
Keywords for this article
NbB2; Refinement; Microstructure; Mechanical properties; Aluminum matrix composites

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Static recrystallization characteristics and kinetics of high-silicon steels for direct quenching and partitioning
  5. Kinetics of intermetallic compound layers during initial period of reaction between mild steel and molten aluminum
  6. Effects of Cr and Zn on the interfacial microstructures of borides in Fe–Cr–B cast steels during hot-dipping in Al–Zn alloys
  7. Hot deformation behaviour of and processing map for an Ni-based austenitic stainless steel
  8. Design, microstructural characterization and heat treatment of novel Cu0.5FeNiVAlx high-entropy alloys
  9. Effects of temperature field and SiC nanoparticles on microstructure and mechanical properties of n-SiCp/Mg-9 %Al composites fabricated by ultrasonication-assisted semi-solid hot pressing of powder
  10. Investigation of the microstructure and mechanical properties of NbB2 particle reinforced aluminum matrix composites
  11. Effect of Al2O3/SiO2 ratio on viscosity and structure of CaO–Al2O3–SiO2–CaF2–MgO slag
  12. Microstructure and oxidation of Ni–Fe2O3 composite coating on AISI 304 stainless steel
  13. Synthesis and performance of Al3+-doped cathode materials 0.6Li[Li1/3Mn2/3]O2 · 0.4Li[Ni1/3Mn1/3Co(1/3-y)Aly]O2 by high temperature solid-state method
  14. Growth and photo-electrochemical properties of rutile TiO2 nanowire arrays prepared by the hydrothermal method
  15. Deposition of fine copper film on samples placed internally and externally to the cathodic cage
  16. DGM News
  17. DGM News
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