期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.01.088
关键词
Magnesium alloys; LPSO structure; Kink; Solute redistribution; HAADF-STEM
类别
资金
- National Natural Science Foundation of China [51301177]
- National Basic Research Program of China [2014CB921002]
- Innovation Fund of IMR [SCJJ2013-PY-08, 2015-PY08]
- Fund of SYNL [2015FP18]
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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