Processing and characterisation of nanocrystalline iron aluminide coatings prepared by thermal spraying of milled powders

T. Grosdidier; H. L. Liao; S. Lenhard; A. Tidu; S. Revol

doi:doi:10.1051/jp4:2001402

Numéro		J. Phys. IV France Volume 11, Numéro PR4, Septembre 2001 4^th European Mechanics of Materials Conference on Processes, Microstructures and Mechanical Properties


Page(s)		Pr4-11 - Pr4-18
DOI		https://doi.org/10.1051/jp4:2001402

4^th European Mechanics of Materials Conference on Processes, Microstructures and Mechanical Properties

J. Phys. IV France 11 (2001) Pr4-11-Pr4-18
DOI: 10.1051/jp4:2001402

Processing and characterisation of nanocrystalline iron aluminide coatings prepared by thermal spraying of milled powders

T. Grosdidier^{1, 2}, H. L. Liao¹, S. Lenhard², A. Tidu² and S. Revol³

¹ Laboratoire d'Étude et Recherche sur les Matériaux et Propriétés des Surfaces (LERMPS), Université de Technologie de Belfort Montbéliard, BP. 449, 90010 Belfort cedex, France
² Laboratoire d'Étude des Textures et Applications aux Matériaux (LETAM), UMR 7078 du CNRS, ISGMP, 57012 Metz cedex 01, France
³ CEA-CEREM, 17 rue des Martyrs, 38054 Grenoble cedex, France

Abstract
This paper presents the first results of an ongoing research which was set up to investigate the possibility of processing an ultra fine grain Fe-40Al (Zr, B) alloy using a thermal spraying route. The coating produced here by high velocity oxy-fuel (HVOF) thermal spraying of milled powder had a highly metastable microstructure, inherited from the initial milling, that was characterised essentially by the nanometer grain size of its FeAl phase. The hardness of this nanocrystalline coating was 35% higher than that of a conventional coating obtained from atomised powder and close to that of a fully dense bulk material having a micrometer grain size.