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Elastic constants of binary iron-base alloys

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Abstract

The Young’s modulus (E) and shear modulus (G) of isotropic Fe and binary Fe-C, Fe-Co, Fe-Cr, Fe-Ir, Fe-Mn, Fe-Ni, Fe-Pt, Fe-Re, Fe-Rh, and Fe-Ru alloys have been determined as functions of composition (0 to 10 at. pet) and temperature (77 to 473 K) by a pulse-echo technique (100 kHz elastic waves). Poisson’s ratio (v) and the bulk modulus (K) have been derived from the values of E and G. The rates of change of E and G with composition (ΔE/Δc and ΔG/Δc) depend on the change of lattice parameter with composition and upon the position of the solute in the periodic table. Both negative and positive values of ΔE/Δc and ΔG/Δc are observed. The values of ΔE/Δc and ΔG/Δc are generally different so that Poisson’s ratio may increase or decrease with composition. Comparable changes in the value ofK/G also occur. These changes cannot be used to predict the effects of alloying additions on the toughness of iron. The temperature dependence of E andG of the alloys is similar to that of iron, decreasing in a nonlinear manner from 77 to 473 K.

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Authors and Affiliations

  1. U. S. Steel Research Laboratory, U. S. Steel Corp., Monroe-ville, Pa

    G. R. Speich (Members of Staff), A. J. Schwoeble (Members of Staff) & W. C. Leslie (Members of Staff)

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  1. G. R. Speich
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  2. A. J. Schwoeble
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  3. W. C. Leslie
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Speich, G.R., Schwoeble, A.J. & Leslie, W.C. Elastic constants of binary iron-base alloys. Metall Trans 3, 2031–2037 (1972). https://doi.org/10.1007/BF02643211

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