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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
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume745Pages:319-330
AbstractDomain 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.
description.department[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
KeywordClose-packed Phases Juxtaposed Pentagonal Antiprisms Transmission Electron-microscopy Laves-phase Mechanical-properties Quasi-crystals Magnesium Alloys C-14 Laves Re Alloys Zr Alloy
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51371178, 51390473, 51771202]; Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-JSC027]; Liaoning Province [2015020237]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79307
Collection中国科学院金属研究所
Corresponding AuthorYang, 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.
Recommended Citation
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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