0177900 - UFM-A 20023086 RIV US eng J - Journal Article
Dobeš, Ferdinand - Milička, Karel
Analysis of creep in long range ordered CuZn in terms of thermally activated overcoming of barriers.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. A324, 1-2 (2002), s. 73-76. ISSN 0921-5093. E-ISSN 1873-4936.
[International Symposium on Plasticity of Metals and Alloys /8./. Praha, 04.09.2000-07.09.2000]
R&D Projects: GA AV ČR IAA2112901
Institutional research plan: CEZ:AV0Z2041904
Keywords : creep * thermal activation * internal stress
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.107, year: 2002

Brass of nominal composition Cu-48 wt.% Zn was creep tested at temperatures from 573 K to 723 K. In this temperature interval the long-range ordered beta phase exists. In addition to conventional creep experiments, constant-structure creep was studied by means of sudden applied-stress changes in the steady-state creep region. A proper combination of the experimental results makes it possible to analyze the deformation process as a thermally-activated overcoming of simple box-shaped obstacles. The Helmholtz and Gibbs free energies of activation and characteristic obstacle spacings can be estimated in this way. Possible refinements of the model, which include a more realistic obstacle shape and a dependence on effective stress are discussed.
Permanent Link: http://hdl.handle.net/11104/0074803