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Microstructural Investigation of Melt-Spun NiTi Based Ribbons

  • K. Mehrabi , M. Bruncko and A.C. Kneissl
Published/Copyright: June 11, 2013
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Practical Metallography
From the journal Practical Metallography Volume 49 Issue 9

Abstract

In order to get small-dimensioned shape memory alloys (SMAs) with good functional and mechanical properties, a rapid solidification technique was employed. This paper discusses the use of different melt-spinning procedures for the preparation of proper thin NiTi ribbons.

Metallographic characterization of SMAs is an important way to evaluate material properties, therefore the effect of alloy composition and different conditions of melt-spinning process (crucible, melting time and temperature) on the various inclusions and microstructure of NiTi alloys was investigated. Specimens for metallographic studies were cut from the longitudinal cross sections of melt-spun ribbons. The microstructures and different phases were examined by optical, scanning and transmission electron microscopy and the influence of the processing methods on microstructures of ribbons will be discussed.

Kurzfassung

Um klein bemessene Legierungen mit Formgedächtnis (SMAs) mit guten funktionellen und mechanischen Eigenschaften zu erhalten, wurde ein Rascherstarrungsverfahren angewandt. In diesem Artikel wird der Einsatz verschiedener Schmelzspinnverfahren zur Herstellung geeigneter, dünner NiTi-Bänder erläutert.

Die metallographische Charakterisierung von SMAs ist eine wichtige Methode zur Bewertung von Werkstoffeigenschaften und deshalb wurden der Einfluss der Zusammensetzung der Legierung und unterschiedlicher Bedingungen des Schmelzspinnvorgangs (Schmelztiegel, Schmelzzeit und Schmelztemperatur) auf die verschiedenen Einschlüsse und die Mikrostruktur von NiTi-Legierungen untersucht. Die Proben für die metallographischen Untersuchungen wurden aus den Längsschnitten schmelzgesponnener Bänder herausgeschnitten. Die Mikrostrukturen und die verschiedenen Phasen wurden mittels Licht-, Rasterelektronen- und Transmissionselektronenmikroskopie untersucht und es wird der Einfluss der Bearbeitungsverfahren auf die Mikrostruktur von Bändern erläutert.

Übersetzung: J. Fritsche

Kambiz Mehrabi obtained his PhD thesis in 2011 at the University of Leoben, Austria entitled: Characterization and Optimization of the Two-Way Effect in Melt-spun NiTi-based SMAs. Since 2007, Research Assistant at the University of Leoben in the field of microstructure characterization and shape memory alloys.

Albert C. Kneissl has been, since 1996, full Professor of Material Science and Head of Chair of Metallography at the University of Leoben, Austria. He is a member of the editorial board and advisory board of the scientific journals Practical Metallography and Zeitschrift für Metallkunde

References / Literatur

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Received: 2012-4-15
Accepted: 2012-6-11
Published Online: 2013-06-11
Published in Print: 2012-09-01

© 2012, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Microstructural Investigation of Melt-Spun NiTi Based Ribbons
  7. The Joint Application of Various Microscopy Techniques for the Evaluation of Area Fraction of Structural Components – Theoretical Assumptions and Practical Aspects
  8. Preparation Routine for the in-situ Strain Analysis of Deep-Drawing Steel DC04 by Means of Transmission Electron Microscopy
  9. High-Temperature Corrosion on Turbine Rotor Blades
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110188

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Microstructural Investigation of Melt-Spun NiTi Based Ribbons
  7. The Joint Application of Various Microscopy Techniques for the Evaluation of Area Fraction of Structural Components – Theoretical Assumptions and Practical Aspects
  8. Preparation Routine for the in-situ Strain Analysis of Deep-Drawing Steel DC04 by Means of Transmission Electron Microscopy
  9. High-Temperature Corrosion on Turbine Rotor Blades
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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