Milling conditions effect on structure and magnetic properties of mechanically alloyed Fe–10% Ni and Fe–20% Ni alloys (original) (raw)

Fe–10 wt.% Ni and Fe–20 wt.% Ni alloys were prepared, using a planetary ball mill. The bcc Fe(Ni) phase formation is identified by X-ray diffraction after 36 h of milling. The higher the shock power, the larger the bcc lattice parameter and the lower the grain size. In the friction mode, the lower the crystallite size (11.1 ± 1.5 nm for Fe–10% Ni and 10.9 ± 1.5 nm for Fe–20% Ni), the lower the lattice strain (0.42 ± 0.05% for Fe–10% Ni and 0.43 ± 0.05% for Fe–20% Ni) for the following milling conditions: (Ω = 300 rpm/ω = 400 rpm) (Ω and ω being the disc and the vial rotation speeds, respectively). In the shock mode (corresponding roughly to the lowest
values), the lower the crystallite size (10.2 ± 1.5 nm for Fe–10% Ni and 10.0 ± 1.5 nm), the higher the lattice strain (0.60 ± 0.05% for Fe–10% Ni and 0.67 ± 0.05% for Fe–20% Ni) for the following milling condition (424 rpm/100 rpm). The highest values of the coercivity have been found in the shock mode. Such highest values, have been found to be equal to 1600 A/m and 1420 A/m for Fe–10% Ni and Fe–20% Ni, respectively. The milling performed in the friction mode has been found to lead to the formation of alloys exhibiting a soft magnetic behavior for both Fe–10 wt.% Ni and Fe–20 wt.% Ni alloys.

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