Abstract The Monte Carlo N-Particle Code were used to design a novel Gd2O3/316L stainless steel neutron shielding composites (Gd2O3/316L NSCs). And the constitutive equation between the 155/157Gd areal density and the neutron shielding rate was established by MCNP. When the areal density of 155/157Gd is larger than 0.01 g/cm2, the thermal neutron shielding rate of the composites reaches 99%. The NSCs with three weight fractions (1.5 wt%, 2.5 wt%, and 4.5 wt% Gd2O3) were successfully fabricated by spark plasma sintering. And Gd2O3 particles evenly distributed in 316L matrix. The main phases of the composite are austenite (γ-Fe) and Gd2O3, and in addition Fe2Gd and Gd2Ni17 are present at the interface of Gd2O3 and 316L matrix particles. The debonding of the Gd2O3 particles is the main cause of material fracture.

中文翻译：

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155/157Gd 面密度：Gd2O3/316L 新型中子屏蔽复合材料的设计和制造模型

摘要 采用蒙特卡罗 N 粒子编码设计了一种新型 Gd2O3/316L 不锈钢中子屏蔽复合材料（Gd2O3/316L NSCs）。并通过MCNP建立了155/157Gd面密度与中子屏蔽率的本构方程。当155/157Gd的面密度大于0.01 g/cm2时，复合材料的热中子屏蔽率达到99%。通过放电等离子体烧结成功制造了具有三种重量分数（1.5 wt%、2.5 wt% 和 4.5 wt% Gd2O3）的 NSC。并且Gd2O3颗粒均匀分布在316L基体中。复合材料的主要相是奥氏体 (γ-Fe) 和 Gd2O3，此外在 Gd2O3 和 316L 基体颗粒的界面处还存在 Fe2Gd 和 Gd2Ni17。Gd2O3 颗粒的脱键是材料断裂的主要原因。