Metallurgical and Materials Transactions A

, Volume 35, Issue 10, pp 3149–3154

Single-crystal elastic constants of Fe-15Ni-15Cr alloy

Authors

  • A. Teklu
    • College of Charleston
  • H. Ledbetter
    • Los Alamos National Laboratory
  • S. Kim
    • the National Institute of Standards and Technology
  • L. A. Boatner
    • the Oak Ridge National Laboratory
  • M. McGuire
    • Cornell University
  • V. Keppens
    • University of Tennessee
Article

DOI: 10.1007/s11661-004-0059-y

Cite this article as:
Teklu, A., Ledbetter, H., Kim, S. et al. Metall and Mat Trans A (2004) 35: 3149. doi:10.1007/s11661-004-0059-y

Abstract

Resonant ultrasound spectroscopy (RUS) and pulse-echo (PE) superposition techniques have been used to determine the three independent elastic-stiffness constants C11, C12, and C44 as a function of temperature for single crystals of 70Fe-15Ni-15Cr alloy. The values of the elastic moduli determined using RUS and PE are in very good agreement within the range of uncertainties. This particular ternary composition of Fe, Ni, and Cr undergoes an fcc-bcc structural phase transformation near 190 K resulting in a low-temperature ferromagnetic phase. The Debye characteristic temperature was determined to be 447 K from PE and 451 K from RUS measurements. The Zener elastic anisotropy A=2C44/(C11−C12) is nearly constant: A=3.53±0.16 in Fe-Ni-Cr alloys with similar compositions. For these alloys, only small variations are observed in the Grüneisen parameter, γ≈2.08, and in the Poisson ratio, v[hkl]=0.293±0.013.

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© ASM International & TMS-The Minerals, Metals and Materials Society 2004