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Volume 44 Issue 5
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Practical Metallography
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Contents
Journal Overview
Contents
Contents/Inhalt
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May 8, 2013
Inhalt / Contents
Page range: 205-205
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Editorial
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Editorial
Page range: 207-207
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Technical Contributions/Fachbeiträge
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May 8, 2013
Elektronenmikroskopische Untersuchung der Mikrostruktur von pseudoelastischen NiTi-Stents
M. Frotscher, A. Kröger, Ch. Somsen, K. Neuking, R. Steegmüller, A. Schüßler, G. Eggeler
Page range: 208-220
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Abstract
Kurzfassung Nickel-Titan-Formgedächtnislegierungen (NiTi-FGL) werden seit einigen Jahren kommerziell erfolgreich eingesetzt. Insbesondere im Bereich der Medizintechnik gibt es zahlreiche Anwendungen, bei denen sich NiTi etabliert hat. Ein Beispiel dafür sind Gefäßprothesen (Stents). Auch wenn NiTi-Stents zur Zeit nur einen Anteil von cirka 12% der weltweit mehr als 3,5 Millionen implantierten Stents pro Jahr ausmachen, wird der Markt für endo- und kardiovaskuläre Stents 2006 ein Volumen von 5,5 Milliarden Euro überschreiten [1, 2]. Bei der Stent-Produktion entstehen Oberflächendefekte, welche unter Ermüdungsbeanspruchung zur Rissbildung beitragen können. Für die Hersteller von Stents sind daher Oberflächenqualität und Mikrostruktur mit Hinblick auf die funktionalen Eigenschaften und Ermüdungsbeständigkeit wichtige Faktoren. In der vorliegenden Arbeit wurden NiTi-Stents mit Hilfe von raster- sowie transmissionselektronenmikroskopischen (TEM) Methoden untersucht. Die Probenpräparation für TEM-Untersuchung wurde mit Hilfe einer Fokussierbaren Ionenstrahlanlage (FIB) durchgeführt, weil aufgrund der geringen Dimensionen eine andere Probenpräparation extrem schwierig ist. Dieses Verfahren wird ausführlich beschrieben und die Ergebnisse diskutiert.
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Metallographic Studies on a Defective Plate Heat Exchanger
Roland Haubner, Susanne Strobl
Page range: 221-234
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Abstract
A defective plate heat exchanger is investigated and the main aim is to find the reason for that damage and how this can be avoided. The plates are made of stainless steel (Cr17Ni12Mo2; material No. 1.4401) and are brazed with pure copper. After cutting and examination of the heat exchanger no relevant corrosion of the copper braze is observed. Metallographic investigations by light optical microscopy (LOM) show that copper has diffused into the steel plates (liquid metal embrittlement). Using various etchings the areas of the steel plates, which are influenced by the copper diffusion, become visible and also an additional phase is observed. Electron beam micro analysis (EBMA) show that this phase is a chromium-rich ferrite.
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Correlation between Crystal Orientation, Channeling Contrast and Topography during FIB Milling of Cu Studied by FIB, EBSD, SEM, and AFM
Ulrich Wendt, Gert Nolze
Page range: 236-238
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May 8, 2013
Fabrication and Modification of Photonic Structures with Focused Ion Beam
Victor Callegari, Philipp M. Nellen, Rolf Brönnimann, Thomas Nanzer, Urs Sennhauser
Page range: 239-243
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Novel Applications of a Focused Ion Beam Workstation for Specimen Preparation and Nanostructuring
Matthias Bückins, Joachim Mayer
Page range: 244-247
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Automated X-Ray Elemental Analysis in Three Dimensions Using a Dual Beam-Focused Ion Beam System
Miroslava Schaffer, Julian Wagner, Hartmuth Schröttner, Mario Schmied
Page range: 248-250
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Journal Overview
About this journal
Practical Metallography is a bilingual (German-English) journal that informs you thoroughly on materialographic preparation, imaging and analysis of microstructures. The journal covers the development and improvement of metallographic methods and equipment, possibilities of optical and electron microscopy, spectroscopy, diffraction techniques, non-destructive testing, metallographic investigations of materials, problems of specimens preparation and evaluation including useful laboratory advice and recipes, failure analysis including damage detection and elimination.
All articles are subject to thorough, independent peer review.
Practical Metallography works closely with Deutsche Gesellschaft für Materialkunde e.V. (DGM)
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