Additive manufacturing of novel aluminium matrix composites with enhanced strength and processability via boron nitride functionalization

IF 4.2 Q2 ENGINEERING, MANUFACTURING Additive manufacturing letters Pub Date : 2024-08-30 DOI:10.1016/j.addlet.2024.100237
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Abstract

The present work systematically investigates the effects of BN nanopowder functionalization on the processability, microstructure and tensile response of the custom Powder Bed Fusion Laser Beam (PBF-LB) Al alloy ‘AMALLOY3D’. The results show that a minor addition of BN (0.3 % by weight) not only produces near fully dense parts (99.91 %), but is also paired with improved flowability, enhancing the overall processability. Electron backscatter diffraction (EBSD) analysis revealed the transformation to a fully equiaxed grain structure in the BN-functionalized material, resulting in a 40 % increase in yield strength. Energy dispersive spectroscopy using a scanning transmission electron microscope (STEM-EDS) was employed to reveal the intricate secondary phases’ arrangements. These observations coupled with the help of the CALPHAD approach led to the reconstruction of the solidification history of AMALLOY3D and the BN-functionalized material. The present study unravels the complex dynamics leading to the columnar-to-equiaxed transition in BN-reinforced AMCs, proving that such unique microstructures and exceptional tensile properties can be achieved without compromising PBF-LB processability.

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通过氮化硼功能化快速制造具有更高强度和加工性能的新型铝基复合材料
本研究系统地探讨了 BN 纳米粉体功能化对定制粉末床熔融激光束(PBF-LB)铝合金 "AMALLOY3D "的加工性、微观结构和拉伸响应的影响。结果表明,少量添加 BN(0.3%(重量百分比))不仅能生产出接近全致密的零件(99.91%),还能改善流动性,提高整体加工性能。电子反向散射衍射 (EBSD) 分析表明,BN 功能化材料的晶粒结构转变为完全等轴晶粒结构,从而使屈服强度提高了 40%。利用扫描透射电子显微镜(STEM-EDS)进行的能量色散光谱分析揭示了复杂的次生相排列。这些观察结果加上 CALPHAD 方法的帮助,重建了 AMALLOY3D 和 BN 功能化材料的凝固历史。本研究揭示了导致 BN 增强 AMC 从柱状到等轴状转变的复杂动力学过程,证明了在不影响 PBF-LB 加工性能的前提下可以实现这种独特的微结构和优异的拉伸性能。
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来源期刊
Additive manufacturing letters
Additive manufacturing letters Materials Science (General), Industrial and Manufacturing Engineering, Mechanics of Materials
CiteScore
3.70
自引率
0.00%
发文量
0
审稿时长
37 days
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