کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1449484 988706 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dislocation-climb plasticity: Modelling and comparison with the mechanical properties of icosahedral AlPdMn
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Dislocation-climb plasticity: Modelling and comparison with the mechanical properties of icosahedral AlPdMn
چکیده انگلیسی

A model of plasticity controlled by the pure climb motion of dislocations is proposed and compared with the mechanical properties of icosahedral AlPdMn. This model takes into account the chemical stress due to an out-of-equilibrium average concentration of vacancies, and the difficult nucleation of jog-pairs on climbing dislocations. It accounts for several unexplained properties of AlPdMn, namely a high strain-hardening at yield, a steady-state flow stress twice higher than the elastic limit, and two-stage relaxation curves. It also explains values of the stress–strain rate sensitivity larger than expected a priori, and activation energies larger than the self-diffusion one. The model may also be applicable to high-temperature deformation of crystals.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 56, Issue 10, June 2008, Pages 2262–2271
نویسندگان
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