Preparing Soft Magnetic Composites for Structural and Micromechanical Investigations
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T. Schwark
Abstract
Soft Magnetic Composites (SMC) consist of pure iron particles with an inorganic phosphorous coating and an additional iron oxide layer at the boundaries between them. It should be specified if the iron oxide is at the boundary of iron and the phosphorous coating or at the outer layer. It is assumed that it's a layer between the iron and the phosphorous layer. This combination of “ductile” and “brittle” constituents represents a challenge for preparing a specimen suitable for both microstructural and micromechanical studies. In particular for micromechanical tests, such as microcompression, microcantilever beam bending, micro tensile tests, and nanoindentation, the quality of the surface is critical. We demonstrate the effect of different surface preparation methods both on the microstructure and the mechanical properties. Mechanical polishing with two different end-polishing steps and combinations of mechanical polishing and ion-beam polishing are compared. Electron microscopy clearly showed the damaged or deformed surface layer of SMC specimens polished only mechanically, which significantly affected the mechanical properties as determined by nanoindentation. The microstructure of the particles was examined with electron backscatter diffraction and transmission electron microscopy revealing a subgrain structure within the particles. While the boundaries do not exhibit any cracks after indentation, the hardness of the boundaries and the adjacent material is clearly enhanced.
Kurzfassung
Weichmagnetische Kompositwerkstoffe (Soft Magnetic Composites, SMC) bestehen aus reinen Eisenpartikeln mit einer anorganischen Phosphorbeschichtung und einer zusätzlichen Eisenoxidschicht in der Grenzfläche. Diese Kombination aus „duktilen“ und „spröden“ Bestandteilen stellt eine Herausforderung bei der Präparation einer Probe dar, die sowohl für mikrostrukturelle als auch für mikromechanische Untersuchungen geeignet ist. Gerade für mikromechanische Tests wie Mikrodruck-, Mikrobiege- und Mikrozugversuche und Nanoindentation ist die Qualität der Oberfläche entscheidend. Wir zeigen die Auswirkungen verschiedener Methoden zur Oberflächenpräparation sowohl auf die Mikrostruktur als auch die mechanischen Eigenschaften. Dabei werden mechanisches Polieren mit zwei unterschiedlichen Endpoliturschritten mit Kombinationen von mechanischem Polieren und Ionenstrahlpolieren miteinander verglichen. Elektronenmikroskopie zeigte deutlich die beschädigte oder deformierte Oberflächenschicht von SMC-Proben, die nur mechanisch poliert wurden. Diese wirkte sich gemäß durchgeführter Nanoindentationsmessungen erheblich auf die mechanischen Eigenschaften aus. Die Mikrostruktur der Partikel wurde mittels Elektronenrückstreubeugung und Transmissionselektronenmikroskopie untersucht, wobei eine Subkornstruktur innerhalb der Partikel zum Vorschein kam. Während die Grenzschichten nach der Indentierung keine Risse aufweisen, ist die Härte der Grenzschichten und des benachbarten Materials deutlich höher.
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© 2017, Carl Hanser Verlag, München
Articles in the same Issue
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- The Copper of the Kyffhäuser Monument
- Preparing Soft Magnetic Composites for Structural and Micromechanical Investigations
- Round Robin Test on the “Analysis of Graphite Shapes by Means of Microscopic Images of Cast Iron Samples” in the DGM Working Group “Quantitative Structural Analysis” of the Expert Committee Materialography
- Failure Analysis
- Cracks in Hot-Dip Galvanized Steel Components
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
Articles in the same Issue
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- The Copper of the Kyffhäuser Monument
- Preparing Soft Magnetic Composites for Structural and Micromechanical Investigations
- Round Robin Test on the “Analysis of Graphite Shapes by Means of Microscopic Images of Cast Iron Samples” in the DGM Working Group “Quantitative Structural Analysis” of the Expert Committee Materialography
- Failure Analysis
- Cracks in Hot-Dip Galvanized Steel Components
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
