کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
787143 | 1465647 | 2011 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chemically and mechanically driven creep due to generation and annihilation of vacancies with non-ideal sources and sinks
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Chemically and mechanically driven creep due to generation and annihilation of vacancies with non-ideal sources and sinks Chemically and mechanically driven creep due to generation and annihilation of vacancies with non-ideal sources and sinks](/preview/png/787143.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Plasticity - Volume 27, Issue 9, September 2011, Pages 1384–1390
Journal: International Journal of Plasticity - Volume 27, Issue 9, September 2011, Pages 1384–1390
نویسندگان
F.D. Fischer, J. Svoboda,