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Controlled Crystallization of Metallic Glasses Through Joule Heating

Published online by Cambridge University Press:  17 March 2011

Marcelo Knobel ,
Rafael Piccin ,
Fábio C.S. da Silva ,
Walter J. Botta Filho  and
Alain Reza Yavari
Marcelo Knobel
Affiliation:
Inst. de Física Gleb Wataghin, Univ. Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
Rafael Piccin
Affiliation:
Inst. de Física Gleb Wataghin, Univ. Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
Fábio C.S. da Silva
Affiliation:
Inst. de Física Gleb Wataghin, Univ. Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
Walter J. Botta Filho
Affiliation:
Depto. de Engenharia de Materiais, Universidade Federal de São Carlos (UFSCar), SP, Brazil
Alain Reza Yavari
Affiliation:
LTPCM-CNRS, Inst. Nat. Polytechnique de Grenoble, Grenoble, France
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Abstract

This work reviews the basic aspects of an alternative thermal treatment of metallic glasses by Joule heating, which explores the heat produced by an electrical current flowing through samples. The advantages of this annealing method are discussed, and a brief description of available models in a variety of materials is given. The experimental procedures are discussed in detail, with emphasis in a new variant of Joule heating, known as “linear varying current Joule heating”. This method allows one to precisely monitor the structural transformations that take place during annealing, by interrupting the thermal treatment at any desired point, leading to samples with controlled micro and/or nanostructures. Some examples of Joule heating curves in novel bulk amorphous samples are shown, to illustrate the excellent perspectives of this annealing technique.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L5.3
Copyright
Copyright © Materials Research Society 2001

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