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首页> 外文期刊>Metals >Effect of the Thermodynamic Behavior of Selective Laser Melting on the Formation of In situ Oxide Dispersion-Strengthened Aluminum-Based Composites
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Effect of the Thermodynamic Behavior of Selective Laser Melting on the Formation of In situ Oxide Dispersion-Strengthened Aluminum-Based Composites

机译：选择性激光熔化的热力学行为对原位氧化物弥散强化铝基复合材料形成的影响

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This paper presents a comprehensive investigation of the phase and microstructure, the thermodynamic behavior within the molten pool, and the growth mechanism of in situ oxide dispersion-strengthened (ODS) aluminum-based composites processed by a selective laser melting (SLM) additive manufacturing/3D printing process. The phase and microstructure were characterized by X-ray diffraction (XRD) and a scanning electronic microscope (SEM) equipped with EDX, respectively. The thermodynamic behavior within the molten pool was investigated for a comprehensive understanding on the growth mechanism of the SLM-processed composite using a finite volume method (FVM). The results revealed that the in situ Al 2 Si 4 O 10 ODS Al-based composites were successfully fabricated by SLM. Combined with the XRD spectrum and EDX analysis, the new silica-rich Al 2 Si 4 O 10 reinforcing phase was identified, which was dispersed around the grain boundaries of the aluminum matrix under a reasonable laser power of 200 W. Combined with the activity of Marangoni convection and repulsion forces, the characteristic microstructure of SLM-processed Al 2 Si 4 O 10 ODS Al-based composites tended to transfer from the irregular network structure to the nearly sphere-like network structure in regular form by increasing the laser power. The formation mechanism of the microstructure of SLM-processed Al 2 Si 4 O 10 ODS Al-based composites is thoroughly discussed herein.
机译：本文对选择性激光熔融（SLM）增材制造/ 3D打印过程。相和微观结构分别由配备EDX的X射线衍射（XRD）和扫描电子显微镜（SEM）表征。对熔池内的热力学行为进行了研究，以使用有限体积法（FVM）全面了解SLM处理的复合材料的生长机理。结果表明，SLM成功制备了原位Al 2 Si 4 O 10 ODS Al基复合材料。结合X射线衍射图谱和EDX分析，确定了新的富含二氧化硅的Al 2 Si 4 O 10增强相，该相在合理的200 W激光功率下分散在铝基体的晶界周围。 SLM处理的Al 2 Si 4 O 10 ODS Al基复合材料的特征是Marangoni对流和排斥力，通过增加激光功率，其倾向于从规则的结构从不规则的网络结构过渡到接近球形的网络结构。本文详细讨论了SLM处理的Al 2 Si 4 O 10 ODS Al基复合材料的微观结构形成机理。

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