Nano-scale dendrites within the conventional dendritic arm
The microstructures and segregations during solidification have been widely recognized in the past researches. The dendrite (termed as conventional dendrite in this paper) was recognized as the most basic entity for microstructures and microsegregation. Through careful analysis and observation in th...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127521008182 |
| _version_ | 1819283627413864448 |
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| author | Xiaoping Ma Hongwei Liu Paixian Fu Dianzhong Li |
| author_facet | Xiaoping Ma Hongwei Liu Paixian Fu Dianzhong Li |
| author_sort | Xiaoping Ma |
| collection | DOAJ |
| description | The microstructures and segregations during solidification have been widely recognized in the past researches. The dendrite (termed as conventional dendrite in this paper) was recognized as the most basic entity for microstructures and microsegregation. Through careful analysis and observation in this paper, new nano-scale dendrites (with dendritic arm spacing about 500 nm) were revealed within the conventional dendritic arm (with dendritic arm spacing about 70 μm). The conventional dendrites should be recognized as macrosegregation patterns arisen in a subtle porous media. Accordingly, the research entity for microsegregation should change from the conventional dendritic arm to a more subtle entity. During solidification, temperature fluctuations with different directions, periods and intensities will superimpose to induce a dendritic temperature field on multi-scales. Because of differentiated solid fractions and liquid compositions, a dendritic macrosegregation field on multi-scales will be induced by the mass transfer. Verified by the in situ and real time observation, the subtle dendrites emerge at the later solidification stage much lower than the equilibrium eutectic temperature. Because nano-scale dendrites were recognized, new solutions were proposed for controlling macrosegregation within the conventional dendritic arm. In a more significant view, the nano-scale dendrites provide the basis for unifying the non-equilibrium solidification and the equilibrium solidification. |
| first_indexed | 2024-12-24T01:34:29Z |
| format | Article |
| id | doaj.art-445b581946f8482ba83c8b29a9ce543c |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-24T01:34:29Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-445b581946f8482ba83c8b29a9ce543c2022-12-21T17:22:14ZengElsevierMaterials & Design0264-12752021-12-01212110263Nano-scale dendrites within the conventional dendritic armXiaoping Ma0Hongwei Liu1Paixian Fu2Dianzhong Li3Corresponding author.; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road No. 72, Shenyang 110016, PR ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road No. 72, Shenyang 110016, PR ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road No. 72, Shenyang 110016, PR ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road No. 72, Shenyang 110016, PR ChinaThe microstructures and segregations during solidification have been widely recognized in the past researches. The dendrite (termed as conventional dendrite in this paper) was recognized as the most basic entity for microstructures and microsegregation. Through careful analysis and observation in this paper, new nano-scale dendrites (with dendritic arm spacing about 500 nm) were revealed within the conventional dendritic arm (with dendritic arm spacing about 70 μm). The conventional dendrites should be recognized as macrosegregation patterns arisen in a subtle porous media. Accordingly, the research entity for microsegregation should change from the conventional dendritic arm to a more subtle entity. During solidification, temperature fluctuations with different directions, periods and intensities will superimpose to induce a dendritic temperature field on multi-scales. Because of differentiated solid fractions and liquid compositions, a dendritic macrosegregation field on multi-scales will be induced by the mass transfer. Verified by the in situ and real time observation, the subtle dendrites emerge at the later solidification stage much lower than the equilibrium eutectic temperature. Because nano-scale dendrites were recognized, new solutions were proposed for controlling macrosegregation within the conventional dendritic arm. In a more significant view, the nano-scale dendrites provide the basis for unifying the non-equilibrium solidification and the equilibrium solidification.http://www.sciencedirect.com/science/article/pii/S0264127521008182SolidificationDendriteMicrostructuresMicrosegregationMacrosegregationMulti-scales |
| spellingShingle | Xiaoping Ma Hongwei Liu Paixian Fu Dianzhong Li Nano-scale dendrites within the conventional dendritic arm Materials & Design Solidification Dendrite Microstructures Microsegregation Macrosegregation Multi-scales |
| title | Nano-scale dendrites within the conventional dendritic arm |
| title_full | Nano-scale dendrites within the conventional dendritic arm |
| title_fullStr | Nano-scale dendrites within the conventional dendritic arm |
| title_full_unstemmed | Nano-scale dendrites within the conventional dendritic arm |
| title_short | Nano-scale dendrites within the conventional dendritic arm |
| title_sort | nano scale dendrites within the conventional dendritic arm |
| topic | Solidification Dendrite Microstructures Microsegregation Macrosegregation Multi-scales |
| url | http://www.sciencedirect.com/science/article/pii/S0264127521008182 |
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