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Dislocation configuration and solute redistribution of low angle kink boundaries in an extruded Mg-Zn-Y-Zr alloy
Peng, Z. Z.; Shao, X. H.; Jin, Q. Q.; Liu, J. F.; Ma, X. L.; Shao, XH; Ma, XL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
2017-02-27
发表期刊MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
卷号687页码:211-220
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.; 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.
部门归属[peng, z. z. ; shao, x. h. ; jin, q. q. ; liu, j. f. ; ma, x. l.] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china ; [jin, q. q.] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china ; [ma, x. l.] lanzhou univ technol, sch mat sci & engn, langongping rd 287, lanzhou 730050, peoples r china
关键词Magnesium Alloys Lpso Structure Kink Solute Redistribution Haadf-stem
学科领域Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者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]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/78280
专题中国科学院金属研究所
通讯作者Shao, XH; Ma, XL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
推荐引用方式
GB/T 7714
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.
APA Peng, Z. Z..,Shao, X. H..,Jin, Q. Q..,Liu, J. F..,Ma, X. L..,...&Ma, XL .(2017).Dislocation configuration and solute redistribution of low angle kink boundaries in an extruded Mg-Zn-Y-Zr alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,687,211-220.
MLA Peng, Z. Z.,et al."Dislocation configuration and solute redistribution of low angle kink boundaries in an extruded Mg-Zn-Y-Zr alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 687(2017):211-220.
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