Jürgen Eckert

Non-Isothermal Kinetic Analysis of the Crystallization of Metallic Glasses Using the Master Curve Method

The non-isothermal transformation rate curves of metallic glasses are analyzed with the Master Curve method grounded in the Kolmogorov-Johnson-Mehl-Avrami theory. The method is applied to the study of two different metallic glasses determining the activation energy of the transformation and the experimental kinetic function that is analyzed using Avrami kinetics. The analysis of the crystallization of Cu47Ti33Zr11Ni8Si1 metallic glassy powders gives Ea = 3.8 eV, in good agreement with the calculation by other methods, and a transformation initiated by an accelerating nucleation and diffusion-controlled growth. The other studied alloy is a Nanoperm-type Fe77Nb7B15Cu1 metallic glass with a primary crystallization of bcc-Fe. An activation energy of Ea = 5.7 eV is obtained from the Master Curve analysis. It is shown that the use of Avrami kinetics is not able to explain the crystallization mechanisms in this alloy giving an Avrami exponent of n = 1.

The 13th International Conference on Rapidly Quenched and Metastable Materials

The 13th International Conference on Rapidly Quenched and Metastable Materials (RQ13) took place in Dresden, Germany, 24–29 August 2008. It belongs to the triennial series of RQ meetings with a long tradition, starting in 1970 – Brela, 1975 – Boston, 1978 – Brighton, 1981 – Sendai, 1984 – Wurzburg, 1987 – Montreal, 1990 – Stockholm, 1993 – Sendai, 1996 – Bratislava, 1999 – Bangalore, 2002 – Oxford, 2005 – Jeju Island. RQ13 was hosted by the Leibniz Institute of Solid State and Materials Research, IFW Dresden. Research on rapidly quenched and metastable materials is stimulated by the high demand for new materials with unique mechanical, chemical and physical properties. Topics of RQ13 conference have fallen into three parts: synthesis and processing, materials and properties, and applications of rapidly quenched and metastable materials. These topics cover exiting developments from the traditional field of rapidly quenched metals to newly emerging areas such as bulk metallic glasses and nanostructured materials. As such, the presentations reported on recent experimental and theoretical achievements in the fields of metastable materials, quasicrystals, nanometer-scale materials, magnetic materials, metallic glasses, solid state reaction, undercooling and modeling. As in the previous proceedings (RQ12), the largest number of papers is dedicated to bulk metallic glasses and magnetic materials. With respect to property characterization and applications, there are great attempts for use and application of these materials, particularly for bulk metallic glasses, as well as for further design and optimization of properties. The RQ13 conference attracted a total of 381 abstracts submitted by scientists from 38 different countries. The conference included 8 plenary talks and 25 invited keynote talks. In addition, 163 regular oral contributions were presented and more than 180 posters were presented. It was a particular highlight of the conference that Dr Ho Sou Chen was awarded the RQ distinguished Fellowship Award for his pioneering research on rapidly quenched and metastable materials and his outstanding contributions to the expansion of the RQ community. It is our pleasure to thank the members of the International Advisory Committee for their valuable help, especially for proposals for plenary and keynote speakers. 129 abstracts were submitted for publication and 119 papers were accepted to be included in the Proceedings. All the papers were reviewed. We would like to express our thanks to all referees for their efficient and prompt efforts. We acknowledge particularly support from the German Society of Research (DFG), the European Office of Aerospace Research and Development, the Dresden University of Technology and the Leibniz Institute for Solid State and Materials Research in Dresden. Finally we are grateful for industrial support from ZOZ, Alfa Aeser, AXO Dresden, Edmund Buhler, Evico magnetics, Goodfellow, RSP and Light Metals Centre. The International Advisory Committee met during the conference and decided to convene the next conference in Brazil, in August 2011. We wish the organizers of RQ14 great success and look forward to meeting you in Brazil. Ludwig Schultz (FW Dresden) Jurgen Eckert (IFW Dresden) Livio Battezzati (Universita di Torino) Mihai Stoica* (IFW Dresden) Guest Editors Dresden, 5 December 2008 (*Corresponding author; e-mail address: m.stoica@ifw-dresden.de)