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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