کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10620901 988741 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Plastic deformation and fracture of ultrafine-grained Al-Mg alloys with a bimodal grain size distribution
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Plastic deformation and fracture of ultrafine-grained Al-Mg alloys with a bimodal grain size distribution
چکیده انگلیسی
Four different ultrafine-grained (ufg) Al-7.5 wt.% Mg alloys were synthesized by consolidation of a mixture of as-received and cryomilled Al-Mg powders with a ratio of 1:9, yielding a bimodal microstructure consisting of coarse grains (grain sizes, dcg, typically of several micrometers) evenly distributed in the ufg matrices (average grain sizes d = 120, 142, 197, and 338 nm). The deformation behavior under uniaxial compression and tension of the as-extruded alloys was investigated. The Ramberg-Osgood equation was used to fit the compressive stress-strain curves of the bimodal ufg alloys. The compressive yield stresses of the ufg matrices with different average grain sizes indicated a reduced slope in the Hall-Petch relation. The plastic deformation of the ufg Al-Mg alloys with a bimodal microstructure was highly localized. The fracture of the alloys was attributed to shear localization under the compressive tests, and to a combination of shear localization, cavitation, and necking under the tensile tests.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 54, Issue 7, April 2006, Pages 1759-1766
نویسندگان
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