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Nanometer-sized domain structure in complex Mg21Zn25 formed by eutectoid phase transformation in a Mg-Zn alloy
Zhang, LF; Wang, WZ; Hu, WW; Yang, ZQ; Ye, HQ; Yang, ZQ (reprint author), Univ Sci & Technol China, Shenyang Natl Lab Mat Sci, Sch Mat Sci & Engn, Inst Met Res,Chinese Acad Sci, Shenyang 110016, Liaoning, Peoples R China.
2018-05-15
发表期刊JOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
卷号745页码:319-330
摘要Domain boundaries (DBs) and their connections in complex Mg21Zn25 have been studied using aberration-corrected scanning-transmission electron microscopy. Three types of {11 (2) over bar0} DBs divided Mg21Zn25 into nanometer-sized domains. Laves-type columns on both sides of different DBs share quadrangular prisms, thin hexagonal prisms or prismatic faces, respectively. This is similar to overlap of clusters in quasicrystals, but different from previously known DBs with displacing vectors along the interfaces. A new concept of separation vector is thus introduced to characterize the DBs and their junctions in Mg21Zn25. Local Zn enrichment activated overgrowth of Laves-type columns, playing a critical role in the formation of DBs in Mg21Zn25 during eutectoid transformation. The sum of separation vectors at each junction is zero for all kinds of junctions, which keeps Mg21Zn25 atomically compact. Our results may shed light on understanding of microstructural evolution during phase transformation, lattice defects and their formation mechanisms in strengthening compounds in Mg-Zn-based alloys. (C) 2018 Elsevier B.V. All rights reserved.; Domain boundaries (DBs) and their connections in complex Mg21Zn25 have been studied using aberration-corrected scanning-transmission electron microscopy. Three types of {11 (2) over bar0} DBs divided Mg21Zn25 into nanometer-sized domains. Laves-type columns on both sides of different DBs share quadrangular prisms, thin hexagonal prisms or prismatic faces, respectively. This is similar to overlap of clusters in quasicrystals, but different from previously known DBs with displacing vectors along the interfaces. A new concept of separation vector is thus introduced to characterize the DBs and their junctions in Mg21Zn25. Local Zn enrichment activated overgrowth of Laves-type columns, playing a critical role in the formation of DBs in Mg21Zn25 during eutectoid transformation. The sum of separation vectors at each junction is zero for all kinds of junctions, which keeps Mg21Zn25 atomically compact. Our results may shed light on understanding of microstructural evolution during phase transformation, lattice defects and their formation mechanisms in strengthening compounds in Mg-Zn-based alloys. (C) 2018 Elsevier B.V. All rights reserved.
部门归属[zhang, lifeng ; hu, weiwei ; yang, zhiqing ; ye, hengqiang] univ sci & technol china, shenyang natl lab mat sci, sch mat sci & engn, inst met res,chinese acad sci, shenyang 110016, liaoning, peoples r china ; [wang, weizhen] northeastern univ, sch mat sci & engn, shenyang 110819, liaoning, peoples r china
关键词Close-packed Phases Juxtaposed Pentagonal Antiprisms Transmission Electron-microscopy Laves-phase Mechanical-properties Quasi-crystals Magnesium Alloys C-14 Laves Re Alloys Zr Alloy
学科领域Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者National Natural Science Foundation of China [51371178, 51390473, 51771202]; Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-JSC027]; Liaoning Province [2015020237]
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/321006/79307
专题中国科学院金属研究所
通讯作者Yang, ZQ (reprint author), Univ Sci & Technol China, Shenyang Natl Lab Mat Sci, Sch Mat Sci & Engn, Inst Met Res,Chinese Acad Sci, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式
GB/T 7714
Zhang, LF,Wang, WZ,Hu, WW,et al. Nanometer-sized domain structure in complex Mg21Zn25 formed by eutectoid phase transformation in a Mg-Zn alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,745:319-330.
APA Zhang, LF,Wang, WZ,Hu, WW,Yang, ZQ,Ye, HQ,&Yang, ZQ .(2018).Nanometer-sized domain structure in complex Mg21Zn25 formed by eutectoid phase transformation in a Mg-Zn alloy.JOURNAL OF ALLOYS AND COMPOUNDS,745,319-330.
MLA Zhang, LF,et al."Nanometer-sized domain structure in complex Mg21Zn25 formed by eutectoid phase transformation in a Mg-Zn alloy".JOURNAL OF ALLOYS AND COMPOUNDS 745(2018):319-330.
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