Magnetic response of Cu (25 wt.%)-316 grade stainless steel processed by ball milling |
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Authors: | B.N. Mondal R. Bhattacharyay D.N. Nath P.P. Chattopadhyay |
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Affiliation: | 1. Department of Central Scientific Services, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India;2. Department of Metallurgy & Materials Engineering, Bengal Engineering and Science University, Shibpur. Howrah 711 103, India;3. Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India |
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Abstract: | Powder blend comprising Cu (25 wt.%) and 316-stainless steel (75 wt.%) has been subjected to ball milling upto 70 h followed by isothermal annealing at the temperature range of 350–750 °C for 1 h to investigate the evolution of microstructure and magnetic properties. The ball milling of the powder blends after 10 h 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 20 h, the α-Fe has dissolved completely in Cu, leading to the formation of partial amorphous phase after 70 h 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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