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Surface & Coatings Technology 206 (2012) 5028-5035
Nitriding aluminum alloys by N-multicharged ions implantation: Correlation between surface strengthening and microstructure modifications
E. Hug1, S. Thibault2, D. Chateigner1, 3, L. Maunoury4

This paper deals with the surface strengthening of aluminum alloys by means of a new process allowing multicharged nitrogen ion implantation. X-ray photoelectron spectroscopy, grazing-incidence X-ray diffraction and atomic force microscopy were used to study microstructural changes involved by implantation. This microstructural study revealed the formation of AlN and AlONγ due to the low nitrogen concentration gradient obtained with multi-charged implantation. Nanoindentation and wear tests were performed to evaluate the mechanical properties of implanted surfaces. A significant improvement of wear resistance was observed as a consequence of the nitride protective layer formation. The observed surface hardening is attributed to both AlONγ and AlN formations and to the precipitation-induced stress.
1 :  CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 :  ENSICAEN - Ecole Nationale Supérieure d'Ingénieurs de Caen et Centre de Recherche [Caen]
3 :  IUT-Caen
4 :  GANIL - Grand Accélérateur National d'Ions Lourds
Physique/Matière Condensée/Science des matériaux
Implantation – Aluminium – Wear behavior – Aluminium nitride – Internal stresses – Mechanical properties