The incorporation of the secondary SiC reinforcement, along with the incorporation of the tertiary and quaternary MgN and SiN phases, in the primary matrix of MgSi is employed in order to provide ultimate wear resistance based on the laser-irradiation-induced inclusion of N gas during laser powder bed fusion. This is substantialized based on both the thermal diffusion- and chemical reaction-based metallurgy of the MgSi–SiC/nitride hybrid composite. This study also proposes a functional platform for systematically modulating a functionally graded structure and modeling build-direction-dependent architectonics during additive manufacturing. This strategy enables the development of a compositional gradient from the center to the edge of each melt pool of the MgSi–SiC/nitride hybrid composite. Consequently, the coefficient of friction of the hybrid composite exhibits a 309.3% decrease to –1.67 compared to –0.54 for the conventional nonreinforced MgSi structure, while the tensile strength exhibits a 171.3% increase to 831.5 MPa compared to 485.3 MPa for the conventional structure. This outstanding mechanical behavior is due to the (1) the complementary and synergistic reinforcement effects of the SiC and nitride compounds, each of which possesses an intrinsically high hardness, and (2) the strong adhesion of these compounds to the MgSi matrix despite their small sizes and low concentrations.

中文翻译：

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氮化物强化 Mg2Si 基杂化复合材料的功能梯度结构

在 MgSi 的主基体中掺入二次 SiC 增强材料，同时掺入三元和四元 MgN 和 SiN 相，以提供基于激光辐照诱导的 N 气夹杂物的最终耐磨性。激光粉末床融合。这是基于 MgSi-SiC/氮化物混合复合材料的热扩散和化学反应冶金学而得以实现的。这项研究还提出了一个功能平台，用于系统地调制功能分级结构并在增材制造过程中对依赖于构建方向的架构进行建模。该策略使得 MgSi-SiC/氮化物杂化复合材料的每个熔池的中心到边缘形成成分梯度。因此，与传统非增强 MgSi 结构的 –0.54 相比，混合复合材料的摩擦系数降低了 309.3% 至 –1.67，而拉伸强度则与传统结构的 485.3 MPa 相比增加了 171.3% 至 831.5 MPa。这种出色的机械性能归因于：(1) SiC 和氮化物化合物的互补和协同增强效应，每种化合物都具有固有的高硬度；(2) 这些化合物尽管尺寸很小，但对 MgSi 基体具有很强的粘附力。尺寸和低浓度。