Diffraction techniques complementary in metallic substrate A.Carradó 1 , J-M. Sprauel 2 , Laurent Barrallier 3, A.Lodini 4 1 E.N.S.A.M., Laboratoire LM3 ESA CNRS 8006, 151 Bd de l’hôpital, F-75013 Paris 2 LM3 UPRESA-CNRS 8006, IUT, 2 av. Gaston Berger, F-13625 Aix en Provence 3 E.N.S.A.M., Équipe MécaSurf, 2, Cours des Arts et Métiers, 13617 Aix en Provence, France 4 L.A.C.M. - Laboratoire d’Analyse de Contraintes Mécaniques, Université de Reims, France ABSTRACT Residual Stress (RS) profile state of palladium alloy sample, used in dentistry applications, has been determined by Neutron Diffraction (ND). Moreover the aims of this work are to improve the experimental techniques dedicated to the evaluation of RS and to demonstrate that the X-Ray and Neutron Diffraction and High Energy Radiation Synchrotron (HERS) techniques are complementary when employed in different zones of the sample. These diffraction measurements are widely used and very powerful tools which permit to obtain in a non- destructive way, the best information in different regions of the crystalline materials. Keywords: Residual Stress, neutron; synchrotron; XRD, palladium alloy, simulation INTRODUCTION Palladium is one of the precious metals. Owing to its corrosion resistance nature and alloying ability, palladium is an important element in metallurgy. Its alloys are currently used in dental and medical devices. Cast alloys have been used for dental restorations for many years. Most alloys were originally high in gold, but due to price increases, and research to improve metal/porcelain compatibility coefficients, subsequent elements, such as palladium, silver, copper, and other elements, were added to alter the physical and mechanical properties of the alloys. The use of palladium and silver alloys in restorations increased at this time as a result of their price advantages. A precise determination of RS in the surface and in the bulk of the materials leads on careful experimental data evaluation obtained in zones which are very difficult to analyse owing to physical phenomena (absorption for HESR measurements and dispersion of wavelength for ND) and geometrical problems. To solve these problems it has introduced a new approach based on a Monte Carlo simulation program in order to modelise any neutron [1, 2, 3] and synchrotron radiation spectrometer [4]. THE STUDIED MATERIAL The examined material was a palladium alloy (Pd=75.5%, Ag=8.1%, Sn= 11.6%, Ga=3.0%, Ru<1 % wt.). For palladium alloy casting ingot of Cerapall® 4CF (Metalor® Ch), only new alloys were used.