Ultra‐Uniform Nanocrystalline Materials via Two‐Step Sintering
© 2020 Wiley-VCH GmbH Nanocrystalline materials with superior properties are of great interest. Much is discussed about obtaining nanograins, but little is known about maintaining grain-size uniformity that is critical for reliability. An especially intriguing question is whether it is possible to a...
| मुख्य लेखकों: | , , , , , , , , |
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| स्वरूप: | लेख |
| भाषा: | English |
| प्रकाशित: |
Wiley
2021
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| ऑनलाइन पहुंच: | https://hdl.handle.net/1721.1/133241 |
| _version_ | 1826217770592763904 |
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| author | Dong, Yanhao Yang, Hongbing Zhang, Lin Li, Xingyu Ding, Dong Wang, Xiaohui Li, Ju Li, Jiangong Chen, I-Wei |
| author_facet | Dong, Yanhao Yang, Hongbing Zhang, Lin Li, Xingyu Ding, Dong Wang, Xiaohui Li, Ju Li, Jiangong Chen, I-Wei |
| author_sort | Dong, Yanhao |
| collection | MIT |
| description | © 2020 Wiley-VCH GmbH Nanocrystalline materials with superior properties are of great interest. Much is discussed about obtaining nanograins, but little is known about maintaining grain-size uniformity that is critical for reliability. An especially intriguing question is whether it is possible to achieve a size distribution narrower than what Hillert theoretically predicted for normal grain growth, a possibility suggested—for growth with a higher growth exponent—by the generalized mean-field theory of Lifshitz, Slyozov, Wagner (LSW), and Hillert but never realized in practice. Following a rationally designed two-step sintering route, it has been made possible in bulk materials by taking advantage of the large growth exponent in the intermediate sintering stage to form a uniform microstructure despite residual porosity, and freezing the grain growth thereafter while continuing densification to reach full density. The bulk dense Al2O3 ceramic thus obtained has an average grain size of 34 nm and a size distribution much narrower than Hillert's prediction. Bulk Al2O3 with a grain-size distribution narrower than the particle-size distribution of starting powders is also demonstrated, as are highly uniform bulk engineering metals (refractory Mo and W-Re alloy) and complex functional ceramics (BaTiO3-based alloys with superior dielectric strength and energy capacity). |
| first_indexed | 2024-09-23T17:08:53Z |
| format | Article |
| id | mit-1721.1/133241 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T17:08:53Z |
| publishDate | 2021 |
| publisher | Wiley |
| record_format | dspace |
| spelling | mit-1721.1/1332412021-10-28T03:01:46Z Ultra‐Uniform Nanocrystalline Materials via Two‐Step Sintering Dong, Yanhao Yang, Hongbing Zhang, Lin Li, Xingyu Ding, Dong Wang, Xiaohui Li, Ju Li, Jiangong Chen, I-Wei © 2020 Wiley-VCH GmbH Nanocrystalline materials with superior properties are of great interest. Much is discussed about obtaining nanograins, but little is known about maintaining grain-size uniformity that is critical for reliability. An especially intriguing question is whether it is possible to achieve a size distribution narrower than what Hillert theoretically predicted for normal grain growth, a possibility suggested—for growth with a higher growth exponent—by the generalized mean-field theory of Lifshitz, Slyozov, Wagner (LSW), and Hillert but never realized in practice. Following a rationally designed two-step sintering route, it has been made possible in bulk materials by taking advantage of the large growth exponent in the intermediate sintering stage to form a uniform microstructure despite residual porosity, and freezing the grain growth thereafter while continuing densification to reach full density. The bulk dense Al2O3 ceramic thus obtained has an average grain size of 34 nm and a size distribution much narrower than Hillert's prediction. Bulk Al2O3 with a grain-size distribution narrower than the particle-size distribution of starting powders is also demonstrated, as are highly uniform bulk engineering metals (refractory Mo and W-Re alloy) and complex functional ceramics (BaTiO3-based alloys with superior dielectric strength and energy capacity). 2021-10-27T19:51:43Z 2021-10-27T19:51:43Z 2021 2021-08-12T16:37:23Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/133241 en 10.1002/ADFM.202007750 Advanced Functional Materials Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Wiley MIT web domain |
| spellingShingle | Dong, Yanhao Yang, Hongbing Zhang, Lin Li, Xingyu Ding, Dong Wang, Xiaohui Li, Ju Li, Jiangong Chen, I-Wei Ultra‐Uniform Nanocrystalline Materials via Two‐Step Sintering |
| title | Ultra‐Uniform Nanocrystalline Materials via Two‐Step Sintering |
| title_full | Ultra‐Uniform Nanocrystalline Materials via Two‐Step Sintering |
| title_fullStr | Ultra‐Uniform Nanocrystalline Materials via Two‐Step Sintering |
| title_full_unstemmed | Ultra‐Uniform Nanocrystalline Materials via Two‐Step Sintering |
| title_short | Ultra‐Uniform Nanocrystalline Materials via Two‐Step Sintering |
| title_sort | ultra uniform nanocrystalline materials via two step sintering |
| url | https://hdl.handle.net/1721.1/133241 |
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