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<p>Among metallic layered composites, multilayer Al-Ni composites are of scientific and practical interest for special applications such as aerospace and automotive industries. In the present study, multilayer Al-Ni composites were processed using the accumulative roll bonding process and then annealed at different temperatures from 400 to 600&#xa0;°C for 30-90&#xa0;min. The effects of accumulative roll bonding and annealing on the quality of the layered composite, the microstructural changes and the properties of the interfaces between the layers were investigated. The microstructural investigations were carried out using optical microscopy, scanning electron microscopy, x-ray diffraction and EDS analysis, and the mechanical properties of the processed samples were evaluated by tensile tests and microhardness measurements. The results showed that a continuous layer of intermetallic compounds such as Al<sub>3</sub>Ni, Al<sub>3</sub>Ni<sub>2</sub>, AlNi and AlNi<sub>3</sub> was formed at the interface between the layers after annealing and that the dominant mechanism in the formation of the intermetallic compounds is diffuse. The results of the tensile tests also showed that annealing reduced the strength and increased the percentage of elongation of the samples. In addition, the hardness also increased with increasing temperature and annealing time, which is attributed to the increase in atomic diffusion during the final annealing phase. </p>

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Formation and Growth of Intermetallic Compounds in Al-Ni Multilayer Composite Processed through Accumulative Roll Bonding

  • 期刊论文

  • 发表日期：

    2025年5月19日

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  • Nasim Akbari,
  • Beitallah Eghbali,
  • Robabeh Jafari

摘要

Among metallic layered composites, multilayer Al-Ni composites are of scientific and practical interest for special applications such as aerospace and automotive industries. In the present study, multilayer Al-Ni composites were processed using the accumulative roll bonding process and then annealed at different temperatures from 400 to 600 °C for 30-90 min. The effects of accumulative roll bonding and annealing on the quality of the layered composite, the microstructural changes and the properties of the interfaces between the layers were investigated. The microstructural investigations were carried out using optical microscopy, scanning electron microscopy, x-ray diffraction and EDS analysis, and the mechanical properties of the processed samples were evaluated by tensile tests and microhardness measurements. The results showed that a continuous layer of intermetallic compounds such as Al3Ni, Al3Ni2, AlNi and AlNi3 was formed at the interface between the layers after annealing and that the dominant mechanism in the formation of the intermetallic compounds is diffuse. The results of the tensile tests also showed that annealing reduced the strength and increased the percentage of elongation of the samples. In addition, the hardness also increased with increasing temperature and annealing time, which is attributed to the increase in atomic diffusion during the final annealing phase.