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Title: A detailed study of the Al 3Ni formation reaction using nanocalorimetry

Abstract

In this study, the Al 3Ni formation reaction was examined at 11 heating rates ranging from 1000 K/s to 100,000 K/s using high-rate nanocalorimetry, time-resolved electron microscopy, isoconversional analysis, and combined kinetic analysis. Two main reaction steps are identified. In the first, interdiffusion occurs between reactants without product nucleation. The estimated activation energy for this process, 113 kJ/mol ± 4 kJ/mol, suggests grain boundary diffusion as the most likely controlling mechanism. In the second step, the Al 3Ni product phase nucleates and grows. Here, the estimated activation energy of 137 kJ/mol ± 4 kJ/mol suggests that growth is enabled by diffusion of Ni through bulk Al. Combined kinetic analysis of the growth regime yields an Avrami reaction model with an exponent of 0.5, implying 1D diffusion-limited growth from a fixed number of randomly distributed nuclei. Finally, combining the results for the two regimes, we propose a mechanism where the Al 3Ni product initially nucleates along the grain boundaries and then grows laterally until the reactants are consumed.

Authors:
 [1];  [2];  [2];  [3];  [4]
  1. Johns Hopkins Univ., Baltimore, MD (United States). Department of Materials Science and Engineering; National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Materials Measurement Science Division
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division, Physical and Life Sciences Directorate
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Materials Measurement Science Division
  4. Johns Hopkins Univ., Baltimore, MD (United States). Department of Materials Science and Engineering
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1466145
Alternate Identifier(s):
OSTI ID: 1512829
Report Number(s):
LLNL-JRNL-737130
Journal ID: ISSN 0040-6031; 889955
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Thermochimica Acta
Additional Journal Information:
Journal Volume: 658; Journal Issue: C; Journal ID: ISSN 0040-6031
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; Nanocalorimetry; Reactive multilayers; Aluminum; Nickel; Isoconversional analysis; Reaction mechanisms

Citation Formats

Grapes, Michael D., Santala, Melissa K., Campbell, Geoffrey H., LaVan, David A., and Weihs, Timothy P.. A detailed study of the Al3Ni formation reaction using nanocalorimetry. United States: N. p., 2017. Web. doi:10.1016/j.tca.2017.10.018.
Grapes, Michael D., Santala, Melissa K., Campbell, Geoffrey H., LaVan, David A., & Weihs, Timothy P.. A detailed study of the Al3Ni formation reaction using nanocalorimetry. United States. doi:10.1016/j.tca.2017.10.018.
Grapes, Michael D., Santala, Melissa K., Campbell, Geoffrey H., LaVan, David A., and Weihs, Timothy P.. Wed . "A detailed study of the Al3Ni formation reaction using nanocalorimetry". United States. doi:10.1016/j.tca.2017.10.018. https://www.osti.gov/servlets/purl/1466145.
@article{osti_1466145,
title = {A detailed study of the Al3Ni formation reaction using nanocalorimetry},
author = {Grapes, Michael D. and Santala, Melissa K. and Campbell, Geoffrey H. and LaVan, David A. and Weihs, Timothy P.},
abstractNote = {In this study, the Al3Ni formation reaction was examined at 11 heating rates ranging from 1000 K/s to 100,000 K/s using high-rate nanocalorimetry, time-resolved electron microscopy, isoconversional analysis, and combined kinetic analysis. Two main reaction steps are identified. In the first, interdiffusion occurs between reactants without product nucleation. The estimated activation energy for this process, 113 kJ/mol ± 4 kJ/mol, suggests grain boundary diffusion as the most likely controlling mechanism. In the second step, the Al3Ni product phase nucleates and grows. Here, the estimated activation energy of 137 kJ/mol ± 4 kJ/mol suggests that growth is enabled by diffusion of Ni through bulk Al. Combined kinetic analysis of the growth regime yields an Avrami reaction model with an exponent of 0.5, implying 1D diffusion-limited growth from a fixed number of randomly distributed nuclei. Finally, combining the results for the two regimes, we propose a mechanism where the Al3Ni product initially nucleates along the grain boundaries and then grows laterally until the reactants are consumed.},
doi = {10.1016/j.tca.2017.10.018},
journal = {Thermochimica Acta},
issn = {0040-6031},
number = C,
volume = 658,
place = {United States},
year = {2017},
month = {10}
}

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