Magnetic and structural data used to monitor the alloying process of mechanically alloyed Fe80Ni20

In the last decades, much attention was given to mechanical alloying as it proved to be a cheap and easy way to produce (even metastable) nanostructured alloys. Especially Fe-Ni alloys have been studied intensely due to their technological and scientific importance. The MA process, however, is not fully understood. Furthermore, remanence properties of Fe80Ni20 are not well known. In our article “Monitoring the alloying process of mechanically synthesized Fe80Ni20through changes in magnetic properties (DOI: j.jallcom.2017.10.090, Volk et al., 2018) [1])” we investigated structural and magnetic properties of the intermediate and final alloys. Elemental Fe (99.5%) and Ni (99.7%) powders were filled in a 80 ml zirconia vials together with 3 mm zirconia milling balls and milled at 400 PRM with a planetary ball mill (Fritsch Pulverisette Premium 7). By subsampling the product at 14 different times during the process, the data presented here shows how crystalline structure (X-ray diffraction) and magnetic properties, induced as well as remanent, of the metastable Fe80Ni20 change during the mechanical synthesis.


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In the last decades, much attention was given to mechanical alloying as it proved to be a cheap and easy way to produce (even metastable) nanostructured alloys. Especially Fe-Ni alloys have been studied intensely due to their technological and scientific importance. The MA process, however, is not fully understood. Furthermore, remanence properties of Fe 80 Ni 20 are not well known. In our article "Monitoring the alloying process of mechanically synthesized Fe 80 Ni 20 through changes in magnetic properties (DOI: j.jallcom.2017.10.090, Volk et al., 2018) [1])" we investigated structural and magnetic properties of the intermediate and final alloys. Elemental Fe (99.5%) and Ni (99.7%) powders were filled in a 80 ml zirconia vials together with 3 mm zirconia milling balls and milled at 400 PRM with a planetary ball mill (Fritsch Pulverisette Premium 7). By subsampling the product at 14 different times during the process, the data presented here shows how crystalline structure (X-ray diffraction) and magnetic properties, induced as well as remanent, of the metastable Fe 80 Ni 20 change during the mechanical synthesis.
& Powder was measured in glass capillaries with 100 μm diameter and 10 μm.
Magnetic measurements: approx. 50 mg of sample was measured and filled into a gel-capsule. The remaining space was filled with high purity quartz-wool Experimental features XRD: -samples are placed in the capillary measurement is done from 10-70°2 Theta in 0.15°steps with a measurement time of 360 s per step Hysteresis: -Magnetization is measured while magnetic field is ramped from 0 T -4 þ 1.5 T -4 -1.5 T -4 þ1.5 T -Magnetization is measured every 1mT with an integration time of 100 ms, using sweeping mode in the VSM (continuous field sweep compared to discrete steps) IRM acquisition: -The sample is AC demagnetized in the VSM prior to the IRM ac. measurement -Starting from a demagnetized state increasingly strong magnetic fields are applied to the sample. After each field step, the remanent magnetization is measured in the residual field of the VSM -The field steps are chosen by the VSM software (logarithmic) -Measurement time per point ¼ 1 s, maximum field ¼ 500 mT DCD: -After the IRM measurement the sample acquires a saturating moment in þ 1 T -Similar to the IRM measurement an increasingly larger negative field is applied and the remaining remanence measured -The field steps are chosen by the VSM software (logarithmic) properties of Fe 80 Ni 20 is important to our understanding of the magnetic signature of meteorites and early planetesimals recovered from meteorites.

Data
Mechanical alloying proved to be a simple way to synthesize intermetallic alloys. The data set shows the influence of increasing milling times on magnetic properties determined from magnetic hysteresis, direct current demagnetization (DCD) and isothermal remanent magnetization (IRM) acquisition [1]. Furthermore, the X-ray diffraction patterns of the FeNi 20 alloy are included, which show the progression of alloying, strain and crystallite size.

Experimental design, materials, and methods
We used a Fritsch Pulverisette Premium (P7) planetary ball mill to synthesize Fe80Ni20. Iron (99.5%, 7.92 g) and Ni (99.7%, 2.08 g) were filled into an 80-ml zirconia vial together with 100 g 3 mm sized milling balls. The vials were prepared in an Ar-filled glove box (O2 o 2%).
Figs. 1-4 show the unprocessed Hysteresis (HYS, left column), DCD (middle column) and IRM acquisition curves (right column). For each milling time three specimens were measured. Each specimen was prepared by filling ca. 50 mg of the powder together with quartz wool into a gel-capsule. Subsampling and sample preparation were done inside a glovebox, filled with Ar. The O 2 Fig. 1. Unprocessed hysteresis loops (first column), direct current demagnetization curves (second column) and acquisition of an isothermal remanent magnetization (right column) for milling times 0-4 min. Data shows the three specimens (S1-S3).
concentration was monitored consistently and never exceeded 2%. A Princeton Measurements Corporation model 3900 vibrating sample magnetometer (VSM) was used for the measurements. For each specimen, the same measurement parameters were used. HYS, IRM and DCD were done in sequence. Fig. 3. Unprocessed hysteresis loops (first column), direct current demagnetization curves (second column) and acquisition of an isothermal remanent magnetization (right column) for milling times 60-480 min.