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Title: A detailed study of the Al3Ni formation reaction using nanocalorimetry

Journal Article · · Thermochimica Acta
 [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

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.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-07NA27344; FWP SCW0974
OSTI ID:
1466145
Alternate ID(s):
OSTI ID: 1512829
Report Number(s):
LLNL-JRNL-737130; 889955
Journal Information:
Thermochimica Acta, Vol. 658, Issue C; ISSN 0040-6031
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Visualization of Polymer Crystallization by In Situ Combination of Atomic Force Microscopy and Fast Scanning Calorimetry journal May 2019
Intermetallic formation at deeply supercooled Ni/Al multilayer interfaces: A molecular dynamics study journal October 2018
A nanocalorimetric study of the effect of composition gradients on crystallization in amorphous Cu-Zr thin films journal March 2019