کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8000198 | 1516272 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In situ transmission electron microscopy investigation of quasicrystal-crystal transformations in Mg-Zn-Y alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: In situ transmission electron microscopy investigation of quasicrystal-crystal transformations in Mg-Zn-Y alloys In situ transmission electron microscopy investigation of quasicrystal-crystal transformations in Mg-Zn-Y alloys](/preview/png/8000198.png)
چکیده انگلیسی
Evolution 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-foldIQC//[0 0 0 1]H//[1 1 1]W and 2-foldIQC//112¯0]H//[01¯1]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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 621, 5 February 2015, Pages 179-188
Journal: Journal of Alloys and Compounds - Volume 621, 5 February 2015, Pages 179-188
نویسندگان
J.F. Liu, Z.Q. Yang, H.Q. Ye,