Coarsening kinetics of coherent precipitates in Fe-10 % Ni-15 % Al alloy

Authors

  • N. Cayetano-Castro Instituto Politécnico Nacional, ESIQIE-DIM
  • H. J. Dorantes-Rosales Instituto Politécnico Nacional, ESIQIE-DIM
  • V. M. López-Hirata Instituto Politécnico Nacional, ESIQIE-DIM
  • J. J. Cruz-Rivera Facultad de Ingeniería-Instituto de Metalurgia UASLP
  • J. Moreno-Palmerin Instituto Politécnico Nacional, ESIQIE-DIM
  • J. L. González-Velázquez Instituto Politécnico Nacional, ESIQIE-DIM

DOI:

https://doi.org/10.3989/revmetalm.2008.v44.i2.104

Keywords:

Coarsening, Phase transformations, Fe-Ni-Al Alloy, Coherent precipitates, Aging

Abstract


The coarsening kinetics and the morphology evolution of the coherent β’ (Fe, Ni)Al precipitates embedded in a ferritic matrix were studied in the aged Fe-10 % Ni-15 % Al alloy. Samples were solution treated at 1,100°C for 24 h and subsequently aged at 750, 850 and 920 °C for different times. XRD, SEM and TEM results showed the following decomposition reaction after aging treatment, αsss → α + β. Intragranular particles distribution changes from a random to an aligned on the elastically soft <100> crystallographic directions of the matrix. Additionally, the morphological evolution of the precipitates was as follows: spheres → cuboids → parallelepipeds → plates. The variation of the cube of mean radius of particles, r3, and the particle density as a function of time followed a linear relationship, as predicted by the Lifshitz, Slyosov and Wagner (LSW) theory for diffusion-controlled coarsening. The rate constant (K) increased with the aging temperature. The activation energy for coarsening process was determined to be about of 220 kJ/mol.

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Published

2008-04-30

How to Cite

Cayetano-Castro, N., Dorantes-Rosales, H. J., López-Hirata, V. M., Cruz-Rivera, J. J., Moreno-Palmerin, J., & González-Velázquez, J. L. (2008). Coarsening kinetics of coherent precipitates in Fe-10 % Ni-15 % Al alloy. Revista De Metalurgia, 44(2), 162–169. https://doi.org/10.3989/revmetalm.2008.v44.i2.104

Issue

Vol. 44 No. 2 (2008)

Section

Articles

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