Transformational invarant

Nickel alloyed with iron is known as Invar, Pernifer 36 and Magnifer and their composition is given in Table 4.35. The alloys have moderately good corrosion resistance to a variety of industrial environments. Alloy with 80% nickel, iron and molybdenum is used as inductive components in transformers, circuit breakers,... 

Fe-Pd-Based Invar Alloys. Alloys of Fe—Pd (see Fig. 4.3-43) containing 28 to 31 at.% Pd show invar characteristics, as seen in Fig. 4.3-44 [3.41]. In order to obtain invar behavior, the alloys are quenched from the high terr5)erature y phase field such that phase transformations at lower temperatures are suppressed. As shown in Fig. 4.3-45 [3.41], the thermal expansion is strongly decreased by cold deformation, i. e., by disordering, lattice defects, and internal stresses. After cold working, an instability of the invar property is observed. 

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