The effect of strain on the formation of an intermetallic layer in an Al-Ni laminated composite

Monireh Azimi, Mohammad Reza Toroghinejad, Morteza Shamanian, Leo A.I. Kestens

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
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Abstract

In the present work, the influence of strain on phase formation at the Al/Ni interface was investigated during cold roll bonding and annealing. A sandwich sample composed of an Al-Ni-Al stack was cold rolled with reductions in the range of 50% to 90%, followed by annealing at 450 °C for 60 min. The crystallography of the annealed sandwich samples was analyzed by XRD (X-ray diffraction), whereas the microstructure was studied by scanning electron microscopy, equipped with EDS (energy dispersive spectrometer) analysis, and optical microscope. In the annealed samples, the intermetallic phase Al3Ni has formed at the Ni/Al interface, preferentially on the Al side of the interface. It is found that the applied strains did not have an effect on the type of intermetallic phase that was formed. However, the rolling reduction has a significant effect on the morphology of the intermetallic layer, as it was observed that after the lowest reduction of 50% only some scattered intermetallic nuclei were present, whereas at the highest rolling reduction of 90% a continuous intermetallic layer of 4.1 μm was exhibited. The formation of the intermetallic layer is discussed in terms of Al and Ni diffusion at the interface and irregular nature of the Al/Ni bonded interface after rolling reductions.

Original languageEnglish
Article number445
Number of pages14
JournalMetals
Volume7
Issue number10
DOIs
Publication statusPublished - 2017

Keywords

  • Aluminum
  • Diffusion
  • Intermetallic
  • Laminated composite
  • Nickel
  • Roll bonding
  • Strain

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