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Title: Nanostructure evolution in joining of Al and Fe nanoparticles with femtosecond laser irradiation

The joining of Al-Fe nanoparticles (NPs) by femtosecond (fs) laser irradiation is reported in this paper. Fe and Al NPs were deposited on a carbon film in vacuum via fs laser ablation. Particles were then exposed to multiple fs laser pulses at fluences between 0.5 and 1.3 mJ/cm{sup 2}. Transmission Electron Microscopy (TEM) and Electron Diffraction X-ray observations indicate that Al and Fe NPs bond to each other under these conditions. For comparison, bonding of Al to Al and Fe to Fe NPs was also investigated. The nanostructure, as observed using TEM, showed that individual Al NPs were monocrystalline while individual Fe NPs were polycrystalline prior to joining and that these structures are retained after the formation of Al-Al and Fe-Fe NPs. Al-Fe NPs produced by fs laser joining exhibited a mixed amorphous and crystalline phase at the interface. Bonding is suggested to originate from intermixing within a region of high field intensity between particles.
Authors:
 [1] ;  [2] ; ;  [3] ;  [2] ;  [4] ;  [5] ;  [4] ;  [6] ;  [3] ;  [2] ;  [1]
  1. State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001 (China)
  2. (Canada)
  3. Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada)
  4. Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada)
  5. (China)
  6. (United States)
Publication Date:
OSTI Identifier:
22273703
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABLATION; ALUMINIUM; AMORPHOUS STATE; CARBON; ELECTRON DIFFRACTION; INTERFACES; IRON; LASER RADIATION; NANOSTRUCTURES; PARTICLE SIZE; PARTICLES; POLYCRYSTALS; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY; X RADIATION