Effect of non-isothermal deposition on surface morphology and microstructure of uniform molten aluminum alloy droplets applied to three-dimensional printing

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• 作者：Han-song Zuo (1)
  He-jun Li (1)
  Le-hua Qi (2)
  Jun Luo (2)
  Song-yi Zhong (2)
  Yao-feng Wu (1)
  
  1. State Key Laboratory of Solidification Processing ; Northwestern Polytechnical University ; Xi鈥檃n ; 710072 ; People鈥檚 Republic of China
  2. School of Mechatronic Engineering ; Northwestern Polytechnical University ; Xi鈥檃n ; 710072 ; People鈥檚 Republic of China
  
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：118
• 期：1
• 页码：327-335
• 全文大小：1,692 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Optical and Electronic Materials
  Nanotechnology
  Characterization and Evaluation Materials
  Surfaces and Interfaces and Thin Films
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0630

文摘

Non-isothermal deposition of uniform molten droplets as basic building blocks has a great influence on the geometric profile and microstructure of metallic components fabricated by the drop-based three-dimensional (3D) printing technology. In this paper, the thermal and dynamic behaviors of molten aluminum droplets during non-isothermal deposition were studied numerically and experimentally. The result shows that local solidification and interfacial re-melting occur during the initial period of non-isothermal deposition. The re-melting in microseconds depends greatly on the impacting droplet temperature, the deposition surface temperature, and the thermal contact resistance. Further, the coupling action of subsequent solidification and oscillation behaviors of aluminum droplet fixed on the target surface was also investigated. It is interesting to find that the formation and distribution of the solidified surface morphology, such as the typical micron-sized ripples, are significantly affected by layer-by-layer solidification and underdamped oscillation in the remaining molten metal. Based on the above research, a semiquantitative relationship between external morphology and internal microstructure was proposed, which was further certified by investigating the piled vertical columns. The works should be helpful for the process optimization and non-destructive detection of drop-based 3D printing techniques.