کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1445515 1509594 2015 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantitative evaluation of creep strain distribution in an extruded Mg–Zn–Gd alloy of multimodal microstructure
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Quantitative evaluation of creep strain distribution in an extruded Mg–Zn–Gd alloy of multimodal microstructure
چکیده انگلیسی

The creep behavior of an extruded Mg–Zn–Gd alloy with a long-period stacking ordered (LPSO) phase is investigated at 473 K under applied stress ranging from 150 to 270 MPa. The microstructure of the extruded alloy is characterized by a multimodal microstructure consisting of three main regions: dynamically recrystallized (DRXed) α-Mg grains with random orientation; worked α-Mg grains with 〈101¯0〉 fiber texture; and fiber-shaped LPSO phase grains. Creep behavior of the extruded alloy shows a high stress exponent of n ≈ 11. Local creep strain distribution in the alloy creeping under 210 MPa is evaluated based on distortion/displacement observed with micro-grid markers. The share contributed to total creep deformation by intra-grain sliding (IGS) in the DRXed and textured grain regions and grain boundary sliding (GBS) is determined methodically in this study. Rates of contribution are ∼79% and ∼21% with IGS and GBS, respectively. To be exact, the shares contributed by IGS are ∼21% and ∼58% in the DRXed and the fiber-textured grain regions, respectively. The greater part of GBS with small strain occurs in the DRXed grain region, but the rest of GBS trailing large local strain is detected at the grain boundary between the DRXed grain and the worked grain showing a high Schmid factor. The magnitude of the slip-induced GBS that occurs at grain boundaries around the worked grain is dependent on two discrete parameters: angle of grain boundary; and Schmid factor of the worked grain.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 82, 1 January 2015, Pages 198–211
نویسندگان
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