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Slip planes and kink properties of screw dislocations in high-purity niobium‡

التفاصيل البيبلوغرافية
العنوان: Slip planes and kink properties of screw dislocations in high-purity niobium‡
المؤلفون: Alfred Seeger, U. Holzwarth
المصدر: Philosophical Magazine. 86:3861-3892
بيانات النشر: Informa UK Limited, 2006.
سنة النشر: 2006
مصطلحات موضوعية: Materials science, Condensed matter physics, Niobium, chemistry.chemical_element, Plasticity, Atmospheric temperature range, Flow stress, Strain rate, Condensed Matter Physics, Crystallography, Discontinuity (geotechnical engineering), Lattice constant, chemistry, Transition metal
الوصف: Temperature and strain-rate dependence of the flow stress of cyclically pre-deformed high-purity niobium single crystals have been measured in the temperature range 120,K ≤T≤350 ,K with high accuracy and reproducibility for five or more resolved shear-strain rates between 6.5×10-5 ,s-1 and 3.5×10-3 ,s-1. The data are quantitatively interpreted in terms of kink-pair generation and kink diffusion in a 0〈111〉/ 2 screw dislocations (a 0= cubic lattice parameter). The prediction of a discontinuity in the stress dependence of the activation volume (occasionally dubbed ‘the hump’) at a strain-rate-independent effective flow stress has been verified. From the stress dependence of the activation volume and from the magnitude of the discontinuity the spatial period of the Peierls barriers of the screw dislocations could be derived without having to assume a special shape of the Peierls potential. In the temperature range investigated, the measured periodicity is in quantitative agreement with {112} as elementary sl...
تدمد: 1478-6443
1478-6435
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::435d9f930a339e876d82d3d3a08c5143
https://doi.org/10.1080/14786430500531769
حقوق: OPEN
رقم الأكسشن: edsair.doi...........435d9f930a339e876d82d3d3a08c5143
قاعدة البيانات: OpenAIRE
الوصف
تدمد:14786443
14786435