Quantitative evaluation of creep strain distribution in an extruded Mg–Zn–Gd alloy of multimodal microstructure
作者： Yuri Jono , Michiaki Yamasaki , Yoshihito Kawamura
DOI: 10.1016/J.ACTAMAT.2014.08.050
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摘要: Abstract 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. microstructure the characterized by multimodal consisting three main regions: dynamically recrystallized (DRXed) α-Mg grains random orientation; worked 〈 1 0 ¯ 〉 fiber texture; and fiber-shaped LPSO grains. Creep shows high exponent n ≈ 11. Local strain distribution in creeping 210 MPa evaluated based on distortion/displacement observed micro-grid markers. share contributed total deformation intra-grain sliding (IGS) DRXed textured grain regions boundary (GBS) determined methodically this study. Rates contribution are ∼79% ∼21% IGS GBS, respectively. To be exact, shares ∼58% fiber-textured regions, greater part GBS small occurs region, but rest trailing large local detected between showing Schmid factor. magnitude slip-induced that boundaries around dependent two discrete parameters: angle boundary; factor grain.
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