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Preparation and mechanical properties of CNTs-AlSi10Mg composite fabricated via selective laser melting

机译：选择性激光熔融制备CNTs-AlSi10Mg复合材料的制备及力学性能

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Selective laser melting（SLM）exhibits unique advantages in the fabrication of micro- and nano-particle reinforced metal matrix composites. Here, we studied the effect of scan speed on the microstructures and mechanical properties of carbon nanotubes (CNTs) reinforced AlSi10Mg composites printed by SLM. To investigate the effects of CNTs on SLM parts, single track scans, single layer scans and test parts of 1 wt%CNTs/AlSi10Mg were created via SLM. The results indicated that as the scan speed increased, the width of the scan line generally decreased and the height of the scan line generally increased. The mechanical properties of the test parts increased at first but then decreased with increasing scan speed. A laser scan speed of 1300 mm/s produced test parts with the highest mechanical properties: the relative density, hardness and tensile strength were 98.53%, 143.33 HV and 499 MPa, respectively. The hardness increased by approximately 10%, and the tensile strength increased by approximately 20% compared to those values exhibited by the unreinforced AlSi10Mg. The CNTs were detected in the fabricated parts. It was found that the CNTs were distributed along the boundaries of the cells of AlSi10Mg. Some of the CNTs reacted to Al4C3 during the SLM process. The combination of CNTs and Al4C3 created a pining effect, while the CNTs still maintained their tubular structure and played a role in loading; this improved the hardness and strength of the matrix material.
机译：选择性激光熔化（SLM）在制造微米和纳米颗粒增强的金属基复合材料方面展现出独特的优势。在这里，我们研究了扫描速度对SLM印刷的碳纳米管（CNTs）增强的AlSi10Mg复合材料的微观结构和力学性能的影响。为了研究碳纳米管对SLM零件的影响，通过SLM创建了1％wt％CNTs / AlSi10Mg的单迹线扫描，单层扫描和测试零件。结果表明，随着扫描速度的增加，扫描线的宽度通常减小，扫描线的高度通常增加。测试零件的机械性能首先增加，但随后随着扫描速度的增加而降低。 1300毫米/秒的激光扫描速度生产出具有最高机械性能的测试零件：相对密度，硬度和抗拉强度分别为98.53％，143.33 HV和499 MPa。与未增强的AlSi10Mg相比，硬度提高了约10％，拉伸强度提高了约20％。在制造的零件中检测到CNT。发现CNT沿着AlSi10Mg的单元的边界分布。在SLM过程中，一些CNT与Al4C3反应。 CNT和Al4C3的结合产生了钉扎效应，而CNT仍保持其管状结构并在负载中起着作用。这提高了基体材料的硬度和强度。

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