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Using a localized‐electron model it is shown that the spontaneous and foreced volume magnetostriction, ωm and ∂ωm/∂H can be consistently interpreted assuming a volume dependence of the exchange interaction. This is expressed by J′1, the first derivative of the exchange intergal I1(r) with respect to the interatomic distance. Quantitative results are reported for Fe‐Ni alloys. In the range 0.05 ≦ 1 – T/Tc ≦ 0.5 ωm and (I/I0)2, the relative magnetization squared, are fitted to a power law (1 – T/Tc)2β, where β increases from 0.31 for pure Ni to ≈ 0.5 for alloys in the Invar range.

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The damping properties of Fe-Cr and Fe-Cr based alloys have been investigated by the cantilever method and the resonant bar method. The change in damping capacity is studied as a function of several parameters including temperature, magnetic field, cold work and heat treatment. The results are correlated with measurements of the coercive force. Binary Fe-Cr alloys with 12-14 % Cr exhibited damping capacities as high as 80 % when heat treated at 1200 °C while the alloy Fe-12Cr-3Al already exhibited damping capacities of the order of 40-60 % when heat treated at temperatures above 750 °C