Fe80Ni20 was prepared by mechanical synthesis using a Fritsch Pulverisette Premium (P7) planetary ball mill at 400 RPM. The alloying process was monitored by measuring the magnetic properties of 14 subsamples taken at different milling times (1–2160 min) as well as structural modifications using powder X-ray diffraction and high-resolution imaging. A macroscopically homogeneous body-centered cubic (bcc) alloy with crystallite sizes below 11 nm and microstrain above 1.2% was reached after 960 min (16 h) of milling. The magnetic properties show three distinct stages: (1) the size reduction of the elementary powders, (2) alloying and (3) reduction in particle size of the final alloy.
Bibliographical noteFunding Information:
This work was supported by Deutsche Forschungsgemeinschaft project WA3402/1-1 under the auspices of SPP1488, Planetary Magnetism. We thank Prof. Dr. Stuart Gilder for the helpful comments and discussions. Furthermore, we would like to thank Martin Leberer and Johannes Heinbuch for their help in the laboratory. Finally, we like to thank four anonymous reviewers, whose comments and suggestions helped improve the manuscript.
© 2017 Elsevier B.V.
- Ball milling
- Magnetic properties
- Mechanical alloying