Nickel-copper alloys magnetic properties

Information on the binding energy, deduced from calorimetric data, is needed to achieve a theoretical description of the adsorbate-adsorbent bond. It has been shown, for instance, that, in the case of the adsorption of hydrogen on nickel-copper alloys, a correlation between heats of adsorption and surface magnetic properties can be found. The correlation indicates that the energy of the bond between adsorbed hydrogen and nickel atoms is regulated by the electron density of states, near the Fermi level, for the metal surface [6-8]. 

In addition to nickel alloys, nickel also forms an important alloying element in stainless steels and in cast irons, in both of which it confers additional corrosion resistance and improved mechanical and engineering properties, and in Fe-Ni alloys for obtaining controlled physical and magnetic properties (see Chapter 3). With non-ferrous metals nickel also forms important types of alloys, especially with copper, i.e. cupro-nickels and nickel silvers these are dealt with in Section 4.2. 

From the point of view of physics, nickel is not nearly as good a conductor as copper, but it is important for its magnetic properties. Iron can be magnetically hardened by alloying it with nickel and cobalt. In this form it finds many uses in permanent magnets. Nickel has many other interesting properties when alloyed with iron or copper, and these contribute to a wide number of technological uses. 

Alloys are metallic substances containing two or more elements which are miscible when molten and do not separate when solidified. They may be liquid or solid. This mixture of elements, usually but not necessarily metals, allows careful manipulation of strength, melting point, corrosion resistance, magnetic, thermal, electrical, and other properties steel, for example, is an alloy of iron and carbon often present with nickel, chromium, copper, aluminium, boron, tungsten, manganese, cobalt, silicon, and other elements. 

This family is represented by nickel alloys 200 (N0220) and 201 (N02201). The chemical composition is shown in Table 15.1. Commercially pure nickel is a white magnetic metal very similar to copper in its other physical and mechanical properties. 

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