Synergetic deformation mechanisms in an Mg-Zn-Y-Zr alloy with intragranular LPSO structures  

作　　者：Z.Z.Peng X.H.Shao Z.M.Liang D.L.Wang L.W.Wang X.L.Ma 

机构地区：[1]Hebei Key Laboratory of Material Near-Net Forming Technology,School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China [2]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,72 Whenua Road,Shenyang 110016,China

出　　处：《Journal of Magnesium and Alloys》2023年第5期1754-1768,共15页镁合金学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.52101015,52171021,and 51871222);Natural Science Foundation of Hebei Province(Grant No.E2020208083);Science and Technology Research Project of Colleges and Universities in Hebei Province(Grant No.BJK2022020).

摘　　要：Deformation kink is one of the important strengthening mechanisms of the long-period-stacking-ordered(LPSO)phase containing magnesium(Mg)alloys,while the deformation twin is generally suppressed.To optimize the mechanical properties of LPSO containing Mg alloy by simultaneously exciting kink and twin,we successfully prepared the Mg-Zn-Y-Zr alloy featuring intragranular LPSO phase and free grain boundary LPSO phase by homogenization.We unraveled the corresponding strengthening and toughening mechanisms through transmission electron microscopy characterization and theoretical analysis.The high strength and good plasticity of the homogenized alloy benefit from the synergistic deformation mechanism of multiple kinking and twining in the grains.And the activation of kinking and twinning depends on the thicknesses of LPSO lamellae and their relative spacing.These results may shed light on optimizing the design of Mg alloys regulating the microstructure of LPSO phases.

关 键 词：Mg alloy LPSO distribution KINK TWIN Transmission electron microscopy 

分 类 号：TG146.22[一般工业技术—材料科学与工程]