The dependence of the crystal magnetic energy constant K1 and the magnetostriction constants λ100 und λ111 on chemical composition and atomic ordering of high‐permeability NiFeW alloys is investigated. The zero‐lines K1 = λ100 = 0, and λ111 = 0 are given in the composition diagram. Furthermore, data are given of the saturation induction, Curie temperature, electrical resistivity, and permeability. The atomic order has a strong influence on K1, a weak one on λ111, and a negligible one on λ100. The best, soft magnetic properties are expected near the composition 77 wt% Ni, 13 wt% Fe, 10 wt% W. The NiFeW alloys show in the concentration area of high permeability the same magnetic and electric properties as other high‐permeability alloys based on NiFe with transition metals as alloying metal.
Based on known nickel-iron alloys with very high permeabilities and our own systematic studies of ternary nickel-iron-vanadium, nickel-iron-tungsten, and higher systems with metal additions Me = Cu, Cr, Mo, W, V, and others, universally valid concepts will be developed on the relations existing in these alloys between chemical composition, structure, heat treatment, and properties. In the case that the added metals enter into an essentially stronger bond with Ni than with Fe, a rule is presented which connects the chemical composition of the high-permeability alloys with the valency of the added metal. The consequences of this rule are discussed and compared with experiment.
In honour of Professor B. I. VERKIN'S 70th birthday High purity molybdenum single crystals (residual resistivity ratio x 6 . lo4) were studied by means of computer-controlled internal friction technique at frequencies of about 100 kHz in the temperature range 6 t o 300 K. The amplitude dependences of decrement were measured within the vibrational strain amplitude lo-' t o It was established that the temperature dependence of ultrasonic amplitude providing a constant level of reversible dislocation deformation coincides well in relative units with the temperature dependence of the critical resolved shear stress at 20 t o 180 K.
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