Abstract
Some recent developments in the examination of materials with the aid of the magnetization curve are described. The well-known method of estimating internal stresses by means of magnetic measurements has recently been much refined so that a quantitatively correct estimate of the internal stresses arising from plastic deformation of nickel and even iron can be made. In special cases even inhomogeneous stresses can be magnetically estimated and the approach to saturation is related to the dislocation density. A fair amount of information about non-magnetic inclusions and precipitates in a magnetic material can be derived from a critical assessment of its coercivity. On the other hand, the measurement of torque curves and of rotational hysteresis allows a comprehensive analysis of the shape, size and density of magnetic precipitates. Finally, the use of magnetic viscosity measurements for structure studies is mentioned.
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