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In situ transmission electron microscopy investigation of quasicrystal-crystal transformations in Mg-Zn-Y alloys
J. F. Liu; Z. Q. Yang; H. Q. Ye
2015
Source PublicationJournal of Alloys and Compounds
ISSN0925-8388
Volume621Pages:179-188
AbstractEvolution of icosahedral quasicrystals (IQC) in Mg-Zn-Y alloys during annealing was investigated by in situ transmission electron microscopy (TEM), in combination with differential thermal analysis and X-ray diffraction. In bulk samples, the IQC phase transformed to face-centered cubic phase W and hexagonal phase H at 720 K and 727 K, respectively. In TEM samples, IQC started to transform to W at 673 K and H at 688 K during heating, and H transformed to W at 623 K on cooling. Quantitative analysis of the in situ transformation process reveals that growth of both H and W is controlled by diffusion, agreeing with the Avrami's model. The transformed products have specific orientation relationships with the parent phases: 3-fold(IQC)//[0001](H)//[111](W) and 2- fold(IQC)//11 (2) over bar0](H)//[0 (1) over bar1](W). The specific orientation relationships are attributed to close structural correlation among icosahedron, distorted icosahedron and cuboctahedron in IQC, H and W phases. The close structure relationship among IQC, H and W phases on the unit-cell level plays an important role in the phase transformations. (C) 2014 Elsevier B.V. All rights reserved.
description.department[liu, j. f. ; yang, z. q. ; ye, h. q.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; yang, zq (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; yangzq34@yahoo.com
KeywordMagnesium Alloys Quasicrystal-crystal Transformation In Situ Tem Kinetics Coherent Interface Mechanical-properties W-phase Metallic Phase High-strength Microstructure Particles Composites Behavior
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73304
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
J. F. Liu,Z. Q. Yang,H. Q. Ye. In situ transmission electron microscopy investigation of quasicrystal-crystal transformations in Mg-Zn-Y alloys[J]. Journal of Alloys and Compounds,2015,621:179-188.
APA J. F. Liu,Z. Q. Yang,&H. Q. Ye.(2015).In situ transmission electron microscopy investigation of quasicrystal-crystal transformations in Mg-Zn-Y alloys.Journal of Alloys and Compounds,621,179-188.
MLA J. F. Liu,et al."In situ transmission electron microscopy investigation of quasicrystal-crystal transformations in Mg-Zn-Y alloys".Journal of Alloys and Compounds 621(2015):179-188.
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