کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1648009 1517323 2011 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Correlation between microstructure and tensile properties in powder metallurgy AZ91 alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Correlation between microstructure and tensile properties in powder metallurgy AZ91 alloys
چکیده انگلیسی

The ultrafine-grained (0.3–1.3 μm) AZ91 alloys, which were fabricated by powder extrusion in the range of 200 to 350 °C and subsequent aging at 100 °C for 8 h, exhibit a remarkable yield stress of 360–478 MPa and moderate tensile elongations of 6–8%. A composite structure was developed after extrusion with uniform β (Mg17Al12) particles dispersed in magnesium matrix. The extrusion temperature has an indirect role on yield stress since partial dissolution of β particles induced by high extrusion temperature fails to retard grain growth. Moreover, the strength was further enhanced by the formation of nano-scale precipitates during artificial aging. The high strength could be attributed to a combination effect of grain refinement, particle reinforcement and precipitation hardening.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 65, Issues 17–18, September 2011, Pages 2686–2689
نویسندگان
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