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... contain 40–50 percent Ni (Permenorm is a typical example), and high-nickel Permalloys, which contain 70–83 percent Ni.The conditions under which heat treatment is carried out play an important role in determining the internal structure that accounts for the good magnetic properties of Permalloys, which are usually heat treated in a vacuum or hydrogen atmosphere ...

... and magnetic permeability (Permenorm). Such alloys are used in many areas of technology that require high sensitivity of the working elements to changes in the magnetic field.Alloys containing 45–55 percent nickel alloyed with small quantities of copper or cobalt have coefficients of linear thermal expansion that are close to that of glass, which is used in cases ...