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PHOTO-INDUCED TRANSITION FROM ELASTIC TO PLASTIC BEHAVIOR IN AMORPHOUS As-Se FILMS STUDIED BY NANOINDENTATION

M. L. Trunov1,* , S. N. Dub2, R. S. Shmegera2

Affiliation

  1. Uzhgorod National University, 13, Kapitulna str., Uzhgorod 88000, Ukraine
  2. Institute for Superhard Materials, 2 Avtozavodskaya str., Kiev 04074, Ukraine

Abstract

The combination of depth-sensing indentation and band-gap illumination has been used to study the photoplastic effect (the reversible influence of light on the flow stress, hardness and plasticity) in chalcogenide glasses on a nanoscale. The prominent photoplasticity of thin As50 Se50 films has been revealed through deviations in the shape of load-displacement curves during nanoindentation under light illumination from those observed for the material in the darkness. The photoinduced changes in static mechanical properties such as nanohardness and elastic (Young’s) modulus have been determined. The results show that Young’s modulus increases by a factor of two under band-gap light illumination while nanohardness decreases drastically. As a result an essential plastic flow for the films under constant load has been observed. This observation is associated with a glass transition from initial elastic state with rigid and floppy phases to their essential modification induced by illumination at ambient temperature..

Keywords

Chalcogenide glass, Photoplasticity, Nanoindentation, Nanohardness, Young’s modulus.

Submitted at: Aug. 8, 2004
Accepted at: March 23, 2005

Citation

M. L. Trunov, S. N. Dub, R. S. Shmegera, PHOTO-INDUCED TRANSITION FROM ELASTIC TO PLASTIC BEHAVIOR IN AMORPHOUS As-Se FILMS STUDIED BY NANOINDENTATION, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 619-624 (2005)