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<p>In the present research, Al6061 metal matrix composites reinforced with 3, 6, and 9&#xa0;Wt.% B<sub>4</sub>C particles were synthesized by stir casting method. The microstructure evaluations using optical microscopy showed that the distribution of reinforcement particles is almost uniform in the Al6061 matrix. Mechanical properties of fabricated composites were studied by room temperature tensile testing. The obtained results indicated that the strength of composites is decreased with increasing the volume fraction of reinforcement particulates and elongation and ductility showed a similar trend. This result indicates that the nature of particle/matrix interface exerts a significant effect on the mechanical properties of particulate-reinforced composites. So that, the microstructural characteristics of matrix phase has a lower impact on mechanical properties compared with the effect of interface quality. Fractured surfaces, analyzed with scanning electron microscopy, showed ductile features consisted of equiaxed dimples. The depth of dimples was decreased with increasing the volume fraction of B<sub>4</sub>C reinforcement particles, and also some cleavage facets were observed indicating that cracks were propagated at the particle/matrix interfaces.</p>

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Fabrication and Characterization of Microstructure and Mechanical Properties Al6061 Matrix Composite Reinforced With B4C Particles

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Y. Pazhuhanfar,
  • Sh.Bagherpour Vlashani,
  • B. Eghbali

摘要

In the present research, Al6061 metal matrix composites reinforced with 3, 6, and 9 Wt.% B4C particles were synthesized by stir casting method. The microstructure evaluations using optical microscopy showed that the distribution of reinforcement particles is almost uniform in the Al6061 matrix. Mechanical properties of fabricated composites were studied by room temperature tensile testing. The obtained results indicated that the strength of composites is decreased with increasing the volume fraction of reinforcement particulates and elongation and ductility showed a similar trend. This result indicates that the nature of particle/matrix interface exerts a significant effect on the mechanical properties of particulate-reinforced composites. So that, the microstructural characteristics of matrix phase has a lower impact on mechanical properties compared with the effect of interface quality. Fractured surfaces, analyzed with scanning electron microscopy, showed ductile features consisted of equiaxed dimples. The depth of dimples was decreased with increasing the volume fraction of B4C reinforcement particles, and also some cleavage facets were observed indicating that cracks were propagated at the particle/matrix interfaces.