J. Phys. I France
Volume 5, Numéro 1, January 1995
Page(s) 1 - 6
DOI: 10.1051/jp1:1995113
J. Phys. I France 5 (1995) 1-6

A New Example of Non-Crystalline Microstructure in Metallurgy

P. Donnadieu1 and A. Redjaïmia2

1  Laboratoire d'Etude des Microstructures (UMR-CNRS 104), 92322 Châtillon Cedex, France
2  Laboratoire de Science et Génie des Surfaces (URA-CNRS 1402), Ecole des Mines, Parc de Saurupt, 54042 Nancy Cedex, France

(Received 12 July 1994, revised 12 October 1994, accepted 8 November 1994)

We report on a non-crystalline microstructure encountered in particles that are formed during the annealing of some steels. The electron diffraction patterns taken on small areas are those of a crystalline phase but the diffraction patterns taken on larger area exhibit non-crystalline symmetry. These anomalous diffraction patterns are interpreted as the result of coherent diffraction between nanometer size domains. Observation show that a crystalline phase identified as a $\chi$-phase structure is involved in this domain microstructure. Some of the electron diffraction pattern features suggest that an icosahedral phase might also be present. However investigations are under progress in order to check this point.

Nous avons observé des particules de microstructures apériodiques dans des aciers recuits. Les diagrammes de diffraction électroniques pris sur des petits domaines dans une particule sont ceux d'une phase cristalline alors que les diagrammes de diffraction pris sur l'ensemble de la particule ne sont plus périodiques. Nous interprétons cet effet par de la diffraction coherente dans une microstructure de domaines cristallins séparés par des parois constitués d'une seconde phase. Les positions des pics de diffraction suggèrent qu'une phase quasicristalline icosaédrique est présente. Des études sont en cours pour examiner ce point.

© Les Editions de Physique 1995

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