首页|Dynamic precipitation and strengthening in a Mg-Zn-Gd alloy during hot deformation
Dynamic precipitation and strengthening in a Mg-Zn-Gd alloy during hot deformation
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NSTL
Elsevier
? 2022 Elsevier B.V.Dynamic precipitation and microstructural evolution during hot deformation in a Mg-Zn-Gd alloy were investigated through systematic microstructural characterizations. Fast dynamic precipitation of β’-Mg7Gd rods was activated along dislocations during plastic deformation in Mg97Zn1Gd2 samples annealed at 773 K for 10 h. Transformation of Mg3GdZn to 14H long-period stacking ordered (LPSO) phase increased solute concentration in Mg matrix by ~ 50% after annealing, which perhaps play an important role in activating dynamic precipitation during subsequent hot deformation, besides assistance of heterogeneous nucleation along dislocations. However, dislocations in cold deformed samples would dissociate upon subsequent annealing at 573 K, producing stacking faults with Suzuki segregation of both Zn and Gd, instead of activating fast precipitation of β’-Mg7Gd rods. Moving dislocations may attract Gd atoms near their slip planes during hot deformation, which is critical for producing local compositional fluctuation high enough to facilitate dynamic precipitation of β’-Mg7Gd. Both the formation of 14H LPSO and dynamic precipitation of β’-Mg7Gd should play a role in strengthening the Mg97Zn1Gd2 alloy.
NSTL
Elsevier
