Size effect on intragranular elastic constants in thin tungsten films

P. Villain (1) , Ph. Goudeau (1) , P.-O. Renault (1) , K. Badawi (1)

1 LMP - Laboratoire de métallurgie physique

The size effect on the elastic constants of nanocrystalline tungsten has been investigated in the case of W/Cu multilayers with two modulation wavelengths (3.1 and 24.0 nm). Tungsten Young’s modulus and Poisson’s ratio have been measured thanks to a technique coupling x-ray diffraction with in situ tensile testing. It is demonstrated that the in-grain thin film elastic constants are highly microstructure—sensitive: in the “3.1 nm” multilayer, tungsten Poisson’s ratio is larger than the bulk one while it is smaller in the “24.0 nm” multilayer; a softening of tungsten Young’s modulus is evidenced in the case of the specimen with the smallest period. REFERENCES

Domaines: Mécanique des matériaux [physics.class-ph]

P. Villain, Ph. Goudeau, P.-O. Renault, K. Badawi. Size effect on intragranular elastic constants in thin tungsten films. Applied Physics Letters, 2002, 81 (23), pp.4365-4367. ⟨10.1063/1.1527229⟩. ⟨hal-03703017⟩