Pyramid-like spikes in a single crystal superalloy produced by picosecond laser irradiation

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• 作者：Wei Zhang ; Xiangzhong Cui ; Qiang Feng ; Guanghua Cheng ; Guojia Ma…
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2013
• 出版时间：November 2013
• 年：2013
• 卷：113
• 期：2
• 页码：373-377
• 全文大小：626KB
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• 作者单位：Wei Zhang (1)
  Xiangzhong Cui (1)
  Qiang Feng (2) (3)
  Guanghua Cheng (4)
  Guojia Ma (1)
  Xiaobing Zhang (1)
  
  1. National Key Laboratory of Science and Technology on Power Beam Processes, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, 100024, China
  2. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, China
  3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
  4. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an Shaanxi, 710119, China
  
• ISSN：1432-0630

文摘

Pyramid-like spikes in a single crystal superalloy were investigated upon irradiation with picosecond (ps) laser pulses (200?ps, 800?nm, 1?kHz) under different laser fluences and pulse numbers. Both sides and grooves of pyramid-like spikes were covered with ripples, which had a period of ?60?nm. The pyramid-like spike separation increased obviously with increasing laser fluence. Microstructural investigations indicate that the pyramid-like spikes were initiated with subsequent pulses from a smooth surface with corrugations and ripples. The coexistence of capillary waves for spikes and capillary waves for ripples in the melted material can be used to explain the formation of the pyramid-like spikes.