Abstract
Powder blend comprising Cu (25wt.%) and 316-stainless steel (75wt.%) has been subjected to ball milling upto 70h followed by isothermal annealing at the temperature range of 350–750°C for 1h to investigate the evolution of microstructure and magnetic properties. The ball milling of the powder blends after 10h has resulted in partitioning of the austenite stabilizing elements such as Ni from 316-stainless steel to elemental Cu leading to the transformation of the Bravais lattice of the Fe-rich phase from fcc (γ) to bcc (α). During further ball milling of the powder mixture upto 20h, the α-Fe has dissolved completely in Cu, leading to the formation of partial amorphous phase after 70h of milling. The amorphous phase of the alloy has been found to stable after annealing at 350°C and super paramagnetic in nature. Annealing of the alloy at higher temperatures has resulted in precipitation of nanocrystalline bcc-Fe in the Cu evolving ferromagnetic properties. Annealing at 750°C has resulted in collapse of the hysteresis loop due to the diminished exchange interaction as the result of grain coarsening of the α-Fe and Cu.
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