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<p>B<sub>4</sub>C/6082Al composites with varying B<sub>4</sub>C contents for neutron shielding were consolidated through one-pass cyclic extrusion compression (CEC) at a deformation temperature of 550&#xa0;°C and an extrusion ratio of 1.56. The effects of B<sub>4</sub>C content and CEC-induced B<sub>4</sub>C characteristics on mechanical properties, crack propagation damage behavior, and neutron shielding performance (NSP) of the B<sub>4</sub>C/6082Al composites were investigated through mechanical testing, finite element simulation, and Monte Carlo simulation. The results indicated that the hardness and ultimate tensile strength (UTS) of the B<sub>4</sub>C/6082Al composites increased with increasing B<sub>4</sub>C content, whereas the relative density (RD) and plasticity decreased. When the B<sub>4</sub>C content reached 40 wt.%, the UTS showed a decline. The 30 wt.% B<sub>4</sub>C/6082Al composites exhibited favorable comprehensive properties, with RD, hardness, and UTS of approximately 99.60%, 99.2 HB, and 278&#xa0;MPa, respectively. These improvements were attributed to the combined contributions of grain refinement strengthening (GRS), dislocation strengthening, and load-transfer strengthening (LTS). Particle rounding and breakage induced by CEC enhanced the LTS effect, while particle agglomeration and CEC-induced weak B<sub>4</sub>C/Al interfaces deteriorated the mechanical properties of B<sub>4</sub>C/6082Al composites. Moreover, particle refinement and uniform dispersion, together with the high densification achieved by CEC, were beneficial for improving the NSP of B<sub>4</sub>C/6082Al composites.</p>

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Mechanical Behavior and Neutron Shielding Performance of B4C/6082Al Composites Consolidated through Cyclic Extrusion Compression

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Chi Zhang,
  • Kemin Xue,
  • Zhehuan Tian,
  • Guotao Wang,
  • Yiyang Zhou,
  • Wenchao Shi,
  • Ping Li

摘要

B4C/6082Al composites with varying B4C contents for neutron shielding were consolidated through one-pass cyclic extrusion compression (CEC) at a deformation temperature of 550 °C and an extrusion ratio of 1.56. The effects of B4C content and CEC-induced B4C characteristics on mechanical properties, crack propagation damage behavior, and neutron shielding performance (NSP) of the B4C/6082Al composites were investigated through mechanical testing, finite element simulation, and Monte Carlo simulation. The results indicated that the hardness and ultimate tensile strength (UTS) of the B4C/6082Al composites increased with increasing B4C content, whereas the relative density (RD) and plasticity decreased. When the B4C content reached 40 wt.%, the UTS showed a decline. The 30 wt.% B4C/6082Al composites exhibited favorable comprehensive properties, with RD, hardness, and UTS of approximately 99.60%, 99.2 HB, and 278 MPa, respectively. These improvements were attributed to the combined contributions of grain refinement strengthening (GRS), dislocation strengthening, and load-transfer strengthening (LTS). Particle rounding and breakage induced by CEC enhanced the LTS effect, while particle agglomeration and CEC-induced weak B4C/Al interfaces deteriorated the mechanical properties of B4C/6082Al composites. Moreover, particle refinement and uniform dispersion, together with the high densification achieved by CEC, were beneficial for improving the NSP of B4C/6082Al composites.