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Dip-Test Internal Stress and the Composite Model of Creep Deformation
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SYSNO ASEP 0024799 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Dip-Test Internal Stress and the Composite Model of Creep Deformation Title Vnitřní napětí a kompozitní model creepové deformace Author(s) Dobeš, Ferdinand (UFM-A) RID, ORCID
Orlová, Alena (UFM-A)Source Title Materials Science Forum - ISSN 0255-5476
Roč. 482, - (2005), s. 291-294Number of pages 4 s. Action Materials Structure & Micromechanics of Fracture /4./ Event date 23.06.2004-25.06.2004 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CH - Switzerland Keywords creep ; internal stress ; subgrain Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects IAA2041202 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20410507 - UFM-A (2005-2011) Annotation The composite model of plastic deformation is regarded as a realistic approximation of creep behaviour at elevated temperatures in a well-developed substructure consisting of dislocationdense subgrain boundaries (hard regions) and subgrain interiors (soft regions) with relatively low dislocation density. In the present contribution, the model is applied for an estimation of internal stresses that are experimentally measured by the dip-test technique. Two situations are considered within the model: (i) the density of moving dislocations is the same in both hard and soft regions and (ii) the density of moving dislocations is proportional to the local density in the respective region. The model enables to express the internal stress in terms of microstructural variables found by independent microscopic observations. It is shown that the magnitude of volume fraction of hard and soft region in the composite model has only a small effect on the value of internal stress. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2006
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