| The spacecraft puts forward to lightweight and high-strength structural materials,meanwhile the neutron radiation could damage to the instruments on spacecraft.Therefore,it is valuable to research material with excellent neutron shielding performance,light weight and high strength in aerospace industry.TiB2/Al composite which has high strength,high plasticity and light weight is an ideal structural material.The optimization of neutron shielding performance of composite was concerned.The main research is as follows:（1）In response to previous studies neglecting the effect of particle agglomeration on neutron shielding performance,an extended calculation model was developed which could reflect the effect of shielding particles agglomeration on neutron shielding performance of material.（2）According to the simulation calculation results,the influence of TiB2 particles and Gd content,particle size,and particle agglomeration on the shielding property of the material was clarified.Besides the addition of TiB2 particles and Gd,the improvement of dispersion and uniformity of shielding component could also lead to the increase of neutron shielding property.（3）According to microstructure analysis combining with neutron shielding test,the friction stirs process and rapid solidification process effectively improved the distribution of TiB2 particles and refined Gd-containing phase,meanwhile improved neutron shielding performance.The experimental results were consistent with the simulation results which further revealed the influence of dispersion on the neutron shielding capability.（4）The mechanical property of TiB2/Al-Mg-Gd composites was studied.The tensile strength and elongation rate of rapid solidification TiB2/Al-6Mg-1Gd composite material were 422MPa and 17.8%,respectively.The required thickness to shield 90%of neutrons reduced to4mm,indicating that the material has greatly increased the shielding performance while maintaining high mechanical properties. |
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