On the groove pressing of Ni-W alloy: microstructure, texture and mechanical properties evolution

S. Koriche (1) , S. Boudekhani-Abbas (1) , H. Azzeddine (1) , K. Abib (1) , A-L Helbert (2) , F. Brisset (2) , T. Baudin (2) , D. Bradai (1)

1 USTHB - Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger]
2 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay

The microstructure, texture and mechanical properties of the Ni-14%W(wt.%) alloy with two different initial grain sizes and textures were investigated after groove pressing (GP) at 450 °C to 4 cycles using Electron Back Scatter Diffraction (EBSD) and microhardness measurements. The initial first series was characterized by small equiaxed grains and Cube dominant texture component. The second series has elongated grains and β-fiber texture. EBSD analysis has shown that GP processing led to a slight refinement (less than 15%) of equiaxed grains in series I while greater refinement (~55%) of the mean spacing along normal direction was observed in series II. The texture did not drastically change from the initial ones and was characterized by the weakening of the Cube component in series I and rapid decrease of Copper component for series II. GP processing reduces very slightly the plastic anisotropy of the alloy with initial elongated granular microstructure.

Mots clés: SPD; Groove Pressing; Ni-W alloy; Microstructure; Texture; plastic anisotropy

Domaines: Sciences de l'ingénieur [physics]; Matériaux

S. Koriche, S. Boudekhani-Abbas, H. Azzeddine, K. Abib, A-L Helbert, et al.. On the groove pressing of Ni-W alloy: microstructure, texture and mechanical properties evolution. Kovové materiály [Metallic materials], 2018, 56 (05), pp.313-323. ⟨10.4149/km_2018_5_313⟩. ⟨hal-02359938⟩