Chemically and mechanically driven creep due to generation and annihilation of vacancies with non-ideal sources and sinks

被引：24
作者：
Fischer, F. D. [1 ]
Svoboda, J. [2 ]
机构：
[1] Univ Leoben, Inst Mech, A-8700 Leoben, Austria
[2] Acad Sci Czech Republ, Inst Phys Mat, CZ-61662 Brno, Czech Republic
来源：
INTERNATIONAL JOURNAL OF PLASTICITY | 2011年 / 27卷 / 09期
关键词：
Creep; Stress relaxation; Crystal plasticity; Polycrystalline material; Thermodynamic extremal principle; TEMPERATURE TRACER DIFFUSION; DISLOCATION DENSITY; SINGLE-CRYSTALS; MATERIAL MODEL; BEHAVIOR; RELAXATION; STATE; PHASE;
D O I：
10.1016/j.ijplas.2011.03.005
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The classical concept of Nabarro creep is extended for a general dislocation microstructure. The specific mechanism of the creep consists in generation and annihilation of vacancies at dislocation jogs acting as non-ideal sources and sinks for vacancies. This mechanism causes the climb of dislocations, allowing for local volume and shape change. The final kinetic equations, relating the dislocation microstructure and the local stress state to the creep rate, are derived by means of the thermodynamic extremal principle. Closed-form equations for the creep rate are derived for isotropic polycrystals. Based on the model the creep rate in the ferritic P-91 type steel at very low applied stress is evaluated and compared with experiment. (C) 2011 Elsevier Ltd. All rights reserved.
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收藏
页码：1384 / 1390
页数：7
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