添加碳纳米管对选区激光熔化AlSi10Mg合金缺陷的影响
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摘要
利用选区激光熔化成形技术制备了纯AlSi10Mg合金及碳纳米管(carbon nanotubes,CNTs)-AlSi10Mg复合材料。当添加CNTs含量为0.05%(质量分数)时具有一定增强效果,但随着CNTs添加量增大,复合材料性能却因为缺陷的增加而明显下降。木实验利用纳米CT技术对纯合金及CNTs(0.5%)-AlSi10Mg复合材料进行缺陷的三维重构。结果表明,添加0.5%的CNTs后,成形缺陷体积所占比例由12%增加至46%;气孔型缺陷数量明显增加,并且等效直径相对较大。CNTs在粉体中的团聚及对气体的吸附作用是两种类型缺陷增加的根本原因。
Pure AlSilOMg alloy and carbon nanotubes(CNTs)-AlSi10Mg composite with different CNTs additions were fabricated by selective laser melting(SLM). The CNTs-AlSilOMg composite is strengthened when the CNTs content is lower than 0.05 wt%. With the increasing CNTs content, however, the strength is decreased significantly because of the poor density. In order to understand the influence of CNTs on the defects in SLMed AlSi10Mg alloy, nano-CT technology was used to get the 3D information of the defects. The results indicate that the volume fraction of large defects(with diameter larger than 50 μm) in the total volume of defects is increased from 12% to 46% in CNTs(0.5 wt%)-AlSi10 Mg composite. The number of gas pores in CNTs(0.5 wt%)-AlSi10Mg composite are significantly increased.The diameter of gas pores in CNTs(0.5 wt%)-AlSi10 Mg composite are larger than that in pure AlSi10 Mg alloy. The agglomeration of CNTs in the powder and gas adsorption are the fundamental reasons for the increase of the two types of defects.
Pure AlSilOMg alloy and carbon nanotubes(CNTs)-AlSi10Mg composite with different CNTs additions were fabricated by selective laser melting(SLM). The CNTs-AlSilOMg composite is strengthened when the CNTs content is lower than 0.05 wt%. With the increasing CNTs content, however, the strength is decreased significantly because of the poor density. In order to understand the influence of CNTs on the defects in SLMed AlSi10Mg alloy, nano-CT technology was used to get the 3D information of the defects. The results indicate that the volume fraction of large defects(with diameter larger than 50 μm) in the total volume of defects is increased from 12% to 46% in CNTs(0.5 wt%)-AlSi10 Mg composite. The number of gas pores in CNTs(0.5 wt%)-AlSi10Mg composite are significantly increased.The diameter of gas pores in CNTs(0.5 wt%)-AlSi10 Mg composite are larger than that in pure AlSi10 Mg alloy. The agglomeration of CNTs in the powder and gas adsorption are the fundamental reasons for the increase of the two types of defects.
引文
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