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Interdiffusion and Reaction Between Al and Zr in the Temperature Range of 425 to 475 °C

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Abstract

Interdiffusion and reaction between Al and Zr was investigated as functions of Zr purity, temperature, and time, using Al versus Zr solid-to-solid diffusion couple annealed in the temperature range from 425 °C to 475 °C. All diffusion couples were observed to develop two intermetallic layers, i.e., Al3Zr and Al2Zr. The Al3Zr phase grew with planar morphology, while the Al2Zr phase developed a non-planar interfacial morphology. Growth rate and integrated interdiffusion coefficients were determined using Wagner’s approach for each phase. Purity of Zr had a significant effect on the development of Al3Zr and Al2Zr phases. Diffusion couples with low-purity Zr (i.e., 99.2%) exhibited a higher growth rate for the Al3Zr, at the expense of Al2Zr growth. Couples with low purity Zr also resulted in a higher degree of non-planarity for Al2Zr phase. In general, degree of non-planarity increased with an increase in anneal time, while it decreased with an increase in temperature. Non-planar morphology was simulated based on 3-D anisotropic diffusion using diffusivity tensor (quadric), and needle-like growth, similar to that observed by experiments were simulated.

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Acknowledgment

This work was supported by the U.S. Department of Energy, Office of Nuclear Materials Threat Reduction (NA-212), National Nuclear Security Administration, under DOE-NE Idaho Operations Office Contract DE-AC07-05ID14517. Accordingly, the U.S. Government retains a non-exclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes.

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Author notes

  1. Judith Dickson

    Present address: Northrop-Grumman, McLean, VA, USA

  2. Ryan Newell

    Present address: Aerojet-Rocketdyne, Palm Beach, FL, USA

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Central Florida, 12760 Pegasus Drive, Orlando, FL, 32816, USA

    Abhishek Mehta, Judith Dickson, Ryan Newell & Yongho Sohn

  2. Idaho National Laboratory, PO Box 1625, Idaho Falls, ID, 83401, USA

    Dennis D. Keiser Jr.

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  1. Abhishek Mehta
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Mehta, A., Dickson, J., Newell, R. et al. Interdiffusion and Reaction Between Al and Zr in the Temperature Range of 425 to 475 °C. J. Phase Equilib. Diffus. 40, 482–494 (2019). https://doi.org/10.1007/s11669-019-00729-9

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