Measurements of elastic moduli of face-centred cubic alloys of transition metals

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Abstract
Ultrasonic pulse-echo overlap measurements of the elastic moduli in the alloys Mn-6.5 at.%Fe, Cr-80.4 at.%Ni and Fe-14.5 at.%Ni-14.5 at.%Cr-2.5 at.%Mo were carried out between 300 and 600K. All of the moduli C, C' and B decreased linearly with increasing temperature in the Cr-Ni and Fe-Ni-Cr-Mo alloys. In the Mn-Fe alloy, C' underwent a rapid increase and B fell to a minimum near the Neel point at 496K while C was only slightly affected by magnetic order. The bulk modulus B is largest in the Cr-Ni alloy and smallest in the Mn-Fe alloy The shear modulus C' is smaller in the Fe-Ni-Cr-Mo alloy than in the other two cases. The anisotropy ratios are 3.918, 3.702 and 2.746 for the Mn-Fe, Fe-Ni-Cr-Mo and Cr-Ni alloys, respectively.