Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.67: Poster

Tuesday, March 13, 2018, 09:30–13:00, Poster A

Additive Manufacturing of Permalloy: Magnetic and Structural Properties — •Hanna Schönrath, Stefan Kilian, Jan T. Sehrt, Marina Spasova, Gerd Witt, and Michael Farle — Universität Duisburg-Essen, Germany

Permalloy (Fe21.5 at.-%, Ni78.5 at.-%) exhibits remarkable soft magnetic properties [1]. Thus it finds its application for example in sensors or inductive devices. In conventional manufacturing methods, several drawbacks include a degradation of magnetic properties [2], geometrical limitations and a waste of material due to post-processing. An alternative approach is the use of Additive Manufacturing (AM) technologies. In particular, Laser Beam Melting (LBM) allows the fabrication of metallic parts with individualized near net shaped structures and complex geometries, which cannot be manufactured with other techniques [3].

We report the manufacturing of LBM-cubes with an edge length of 5 mm using a magnetic powder blend with 21.5 at.-% Fe and 78.5 at.-% Ni. For high energy input during the production, Energy-dispersive X-ray Spectroscopy revealed a line-shaped segregation of Fe and Ni at the surface of the cubes and a FeNi₃ phase in the bulk material. Additionally Magnetometry indicated an increase of the saturation magnetization of the bulk material with increasing energy input.

[1] Jiles, D.C. Acta Mater. 51 (2003) 5907.

[2] Fenineche, N.E., et al. Mater. Lett. 58 (2004) 1797.

[7] Frazier, W.E. JMEPEG 23 (2014) 1917.