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刘西河,赵聪聪,周鑫,刘伟,沈志坚,Florian Eibl,Wilhelm Meiners.添加碳纳米管对选区激光熔化AlSi10Mg合金缺陷的影响[J].稀有金属材料与工程(英文),2019,48(5):1637~1644.[Liu Xihe,Zhao Congcong,Zhou Xin,Liu Wei,Shen Zhijian,Florian Eibl and Wilhelm Meiners.The Influence of Carbon Nanotubes on Defects in AlSi10Mg alloy fabricated by Selective Laser Melting[J].Rare Metal Materials and Engineering,2019,48(5):1637~1644.]
The Influence of Carbon Nanotubes on Defects in AlSi10Mg alloy fabricated by Selective Laser Melting
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Received:September 28, 2018  Revised:October 22, 2018
DOI:
Key words: Selective laser melting  AlSi10Mg  Carbon nanotubes  defect  nano-CT
Foundation item:国家自然科学基金资助(项目号U1605243),国家磁约束聚变科学计划(项目号2014GB117000)
Author NameAffiliation
Liu Xihe,Zhao Congcong,Zhou Xin,Liu Wei,Shen Zhijian,Florian Eibl and Wilhelm Meiners  
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Abstract:
      Pure AlSi10Mg alloy and Carbon Nanotubes (CNTs)-AlSi10Mg composite with different CNTs addition were fabricated by selective laser melting (SLM). The CNTs-AlSi10Mg composite was strengthened when the CNTs content was lower than 0.05 wt.%. With the increasing CNTs content, however, the strength was 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 indicated that the volume fraction of large defects(with diameter larger than 50 μm) in the total volume of defects was increased from 12% to 46% in CNTs(0.5wt.%)-AlSi10Mg composite. The number of gas pores in CNTs(0.5wt.%)-AlSi10Mg composite were significantly increased. The diameter of gas pores in CNTs(0.5wt.%)-AlSi10Mg composite were larger than that in pure AlSi10Mg alloy. The agglomeration of CNTs in the powder and gas adsorption are the fundamental reasons for the increase of the two types of defects.