Damage fluctuations in creep deformed copper studied with synchrotron X-ray microtomography

Ramin Abbasi (1, 2, 3) , Loïc Renversade (1, 2, 3) , Kristof Dzieciol (1, 2, 3) , András Borbély (1, 2, 3) , Anke R. Kaysser-Pyzalla (4)

1 SMS-ENSMSE - Centre Science des Matériaux et des Structures
2 LCG-ENSMSE - UMR 5146 - Laboratoire Claude Goux
3 MPM-ENSMSE - Département Microstructures et Propriétés Mécaniques
4 HZB - Helmholtz-Zentrum Berlin für Materialien und Energie GmbH = Helmholtz Centre Berlin for Materials and Energy = Centre Helmholtz de Berlin pour les matériaux et l'énergie

Damage localization during power law creep of copper has been investigated in situ with synchrotron X-ray microtomography. The analysis of the area fraction of cavities corresponding to a given material slice has revealed that damage localization begins relatively early at half of the creep lifetime. The amplitude of the maximum fluctuation shows parabolic behavior as a function of mean void volume fraction. Existing models of damage evolution underpredict the amount of real damage and overpredict power-law creep life-time.

Mots clés: Creep damage; Damage fluctuations; Microtomography; Void growth; power-law creep; growth; tomography; stress; energy; voids

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

Ramin Abbasi, Loïc Renversade, Kristof Dzieciol, András Borbély, Anke R. Kaysser-Pyzalla. Damage fluctuations in creep deformed copper studied with synchrotron X-ray microtomography. International Journal of Materials Research, 2012, 103 (2), pp.228-233. ⟨10.3139/146.110662⟩. ⟨hal-00818284⟩