Slip-induced anisotropy

In the Ni-Fe system at room temperature, the a phase extends from 0 to 7% Ni, then a. Fy mixtures from 7 to 50% Ni, and the y phase from 50 to 100% Ni. y-Phase alloys in the Ni-Fe system, known as Permalloys, exhibit a wide variety of magnetic properties, which may be controlled precisely by means of well-established technologies. Initial permeabilities up to 10 in an extremely wide temperature range, as well as coercive fields between 0.16 and 800 A/m, can be obtained (Chin Wemick, 1980). Induced anisotropy of 65-85% Ni alloys can be drastically varied by field annealing and mechanical deformation (slip-induced anisotropy) an order-disorder transformation occurs for Ni3Fe finally, preferential orientation can be induced in 50%Ni-50%Fe. 

Fig. 14. Slip-induced uniaxial anisotropy constant as a function of thickness strain for single crystals compressed in (110) [Tl2] orientation and for rolled polycrystalline material 2Mo-76Ni-22Fe alloy (after Chin ).

Next we would like to mention the mechanical properties of these compounds. The microhardness anisotropy of a single crystal induces a slip system because the hardness maxima and... 

---