Investigator: Ing. Ferdinand Dobeš, DrSc.
Number of Project: IAA2041202
Agency: Grant Agency of the Academy of Sciences of the Czech Republic
Duration: 01. 01. 2002 - 31. 12. 2004

In an analysis of high temperature deformation, two approaches based on a simple characterization of microstructure are applied, namely the internal stress approach and the obstacle strength approach. Both approaches meet problems in explaining the temperature dependence of the steady-state creep rate. The possible ways how to overcome this deficiency are proposed. In both approaches as well as in their combination, the new ways utilize the results of stress change experiments.

F. Dobeš, K. Milička:
Comparison of thermally activated overcoming of barriers in creep of aluminum and its solid solutions
Materials Science and Engineering A 387-389: 595-598, 2004.

F. Dobeš, A. Orlová:
Dip-test internal stress and the composite model of creep deformation
Materials Science Forum 482: 291-294, 2005.

Zehetbauer M, Schafler E, Dobeš F, Milička K.
A critical analysis of the composite model as applied to high-temperature creep of Al and an Al-Mg alloy
Zeitschrift für Metallkunde 97: 329-335, 2006

Dobeš, Ferdinand, Milička, Karel:
Internal Stress and Activation Energy of Creep. Materials Science and Engineering A: Structural materials. Roč. 462, č. 1-2 (2007), s. 380-383. ISSN 0921-5093.

K. Milička, F. Dobeš, E. Schafler, M. Zehetbauer:
Comparison of X-ray line profile and dip tests measurements of internal stresses during high temperature creep of copper.
Kovove Mater. 41: 133-144, 2003

A.Orlová, F. Dobeš:
Internal stress and heterogeneous dislocation structure in creep
Philos.Mag. 83: 2681-2691, 2003

A.Orlová, F. Dobeš:
On the stress-subgrain size relationships derived from the composite model of dislocation structure
Mater. Sci. Engng. A381: 171-174, 2004