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题名: Dislocation configuration and solute redistribution of low angle kink boundaries in an extruded Mg-Zn-Y-Zr alloy
作者: Peng, Z. Z.;  Shao, X. H.;  Jin, Q. Q.;  Liu, J. F.;  Ma, X. L.
发表日期: 2017-2-27
摘要: The microstructural and chemical features of deformation-induced interfaces are one of key issues in engineering materials because they determine plastic deformation behavior and thus affect mechanical properties of the materials. Using atomic-resolution high-angle annular dark-field scanning transmission electron microscopy, we characterized deformation-induced low angle kink boundaries (LAKBs) in long period stacking ordered (LPSO) structures in an extruded Mg-2.3Zn-6.6Y-0.56Zr (wt%) alloy. We clarified that the LAKB in LPSO phase consists of an array of < a > dislocations, while the LAKB in Mg interlayers sandwiched between LPSO phases is composed of an array of dissociated < c+a > and/or < a > dislocations. Correspondingly, the former and the latter LAKBs are depleted and segregated with Zn/Y/Zr elements, respectively. I-2 stacking fault (SF) is meanwhile generated in Mg layers, and its energy is evaluated approximately 0.1-1.6 mJ m(-2). Deformation-induced LAKBs, the resultant redistribution of solute elements, and precipitated I-2 SFs, are proposed to be responsible for the high strength of extruded Mg alloys containing LPSO structures.
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Recommended Citation:
Peng, Z. Z.,Shao, X. H.,Jin, Q. Q.,et al. Dislocation Configuration And Solute Redistribution Of Low Angle Kink Boundaries In An Extruded Mg-zn-y-zr Alloy[J]. Materials Science And Engineering A-structural Materials Properties Microstructure And Processing,2017,687:211-220.

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