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

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-Cr alloy. The values of the elastic moduli determined usin...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2004-10, Vol.35 (10), p.3149-3154
Main Authors: TEKLU, A, LEDBETTER, H, KIM, S, BOATNER, L. A, MCGUIRE, M, KEPPENS, V
Format: Article
Language:English
Subjects:
Chromium alloys
Condensed matter: structure, mechanical and thermal properties
Elasticity, elastic constants
Exact sciences and technology
Iron alloys
Materials elasticity
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Metallurgy
Nickel alloys
Physics
Spectrum analysis
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Summary: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-Cr 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 Gruneisen parameter, *g #~ 2.08, and in the Poisson ratio, v[hkl] = 0.293 plus/minus 0.013.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-004-0059-y