Practical Metallography Volume 43 Issue 12

Practical Metallography

Volume 43 Issue 12

Contents
Journal Overview

Laudatio zur Ernennung des Ehrenvorsitzenden des FA Materialographie der DGM Prof. Dr. rer. nat. Dr. h. c. mult. Günter Petzow im Rahmen der Eröffnung der 12. Internationalen Metallographietagung am 27. September 2006 im Audimax der Montanuniversität Leoben

May 4, 2013

Cite

SEM Micrographs from NiTi-based Shape Memory Alloys after Mechanical Polishing and Electropolishing

Zhonghua Zhang, Janine Pfetzing, Jan Frenzel, Klaus Neuking, Gunther Eggeler May 4, 2013

More Cite

Abstract

In the present study we investigate microstructures of NiTi-based shape memory alloys (SMAs) using scanning electron microscopy (SEM) in combination with mechanical polishing and electropolishing. The results show that electropolishing is quite useful for microstructural characterization of NiTi-based SMAs revealing morphologies of second phases, characteristic features of eutectic regions, growth mechanisms of primary carbides and coarsening of second phases. Furthermore, three-dimensional morphologies of martensitic variants, twins, and substructures can be identified in electropolished high temperature SMAs like NiTiHf and NiTiZr.

Metallographische Präparation von dotiertem Tantal für licht- und rasterelektronenmikroskopische Mikrostrukturuntersuchungen

Svea Mayer, Silvia Pölzl, Gerhard Hawranek, Michael Bischof, Christina Scheu, Helmut Clemens, Wolfram Knabl May 4, 2013

More Cite

Abstract

Kurzfassung Dünne kornwachstumsresistente Tantaldrähte werden zur Herstellung von elektrischen Tantalkondensatoren verwendet. Um den Herstellungsprozess zu optimieren, ist es wichtig, die Mikrostruktur von dotiertem Tantal nach unterschiedlichen Herstell- bzw. Wärmebehandlungsschritten zu untersuchen. Dies setzt jedoch voraus, dass eine geeignete artefaktfreie Präparationsmethode für dotiertes Tantal vorliegt, beziehungsweise die bestehenden Methoden verbessert werden. In der vorliegenden Arbeit werden optimierte Präparationsmethoden für licht- und rasterelektronenmikroskopische Untersuchungen vorgestellt. Neben der Beschreibung der Probenpräparation wird auch auf die wichtigsten Ergebnisse der anschließenden mikrostrukturellen Untersuchungen eingegangen.

Mechanical Behavior and Deformation Modes of Commercially Pure Titanium under Impact Tensile Load

Q. Y. Sun, R. H. Zhu, Z. T. Yu, H. C. Gu May 4, 2013

More Cite

Abstract

The impact tensile test was carried out on hot-rolled commercially pure titanium at temperature from 293 K to 77 K. The microstructures after fracture were examined by transmission electron microscope to determine the deformation modes. Strength and ductility increase with decreasing temperature from 293 K to 77 K. The investigation on the microstructure shows that slip cooperates with twinning in the deformation, and twinning becomes more active at lower temperature. At high strain rate titanium exhibits obvious strain hardening and twinning plays an important role in strain hardening. {1012} twin is identified in the microstructure at room temperature and three types of twins were identified at 77 K, which are {1011}, {1012}, {1121} twins.

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)