Abstract
Pulse-echo overlap measurements of the shear modulus, G, and the bulk modulus, B, have been carried out on polycrystalline samples of two Ti-V alloys and two Cr-Fe alloys of the body-centred cubic (BCC) structure to supplement earlier measurements on four BCC alloys of the V-Cr system. The Ti-V samples contained 57.8 and 80.2 at.%V, and the Cr-Fe samples 10.8 and 22.2 at.%Fe. Between the electron concentrations X=4.6 and X=6.5, both G and B increase with increasing X from X=4.6 to X=5.8 and decrease from X=6.2 to X=6.5. At X=4.6, G=0.34 and B=1.29*1011 N m-2 while at X=6.5, G=1.00 and B=1.87*1011 N m-2. For all the alloys G is lower than the value of G=1.16*1011 N m-2 for chromium, corresponding to X=6.0. In B there is at X=6.0 the characteristic drop arising from the antiferromagnetism. The extrapolated values for the bulk modulus of chromium obtained from the alloys with X 6 are about 2.04*1011 N m-2, in agreement with results of high-temperature measurements on Cr. The contributions to G and B from the decrease in atomic volume, V, increase in the alloy series from Ti to Fe. The decrease in B with X in the range X>6 seems to be related to the change in the slope of the V against X curve at X=6.
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